Showing papers on "Potassium dichromate published in 2009"
TL;DR: In this paper, the conversion of Cr(VI) to Cr(III) in an aqueous medium by photocatalytic reduction using UV radiation and ZnO semiconductor catalyst has been investigated using potassium dichromate as the model compound.
138 citations
TL;DR: It is demonstrated that potassium dichromate was highly cytotoxic to HepG2 cells, and its cytotoxicity seems to be mediated by oxidative stress and DNA damage.
Abstract: Chromium is a widespread industrial waste. The soluble hexavalent chromium Cr (VI) is an environmental contaminant widely recognized to act as a carcinogen, mutagen and teratogen towards humans and animals. The fate of chromium in the environment is dependent on its oxidation state. Hexavalent chromium primarily enters the cells and undergoes metabolic reduction to trivalent chromium, resulting in the formation of reactive oxygen species together with oxidative tissue damage and a cascade of cellular events. However, the results from in vitro studies are often conflicting. The aim of this study was to develop a model to establish relationships between cytotoxicity, genotoxicity and oxidative stress, in human liver carcinoma [HepG2] cells exposed to potassium dichromate. HepG2 cells were cultured following standard protocols and exposed to various concentrations [0-50 microM] of potassium dichromate [K2Cr2O7]. Following exposure to the toxic metal, the MTT assay was performed to assess the cytotoxicity, the thiobarbituric acid test to evaluate the degree of lipid peroxidation as an indicator of oxidative stress and the alkaline comet assay was used to assess DNA damage to study genotoxicity. The results of the study indicated that potassium dichromate was cytotoxic to HepG2 cells. The LD(50) values of 8.83 +/- 0.89 microg/ml, 6.76 +/- 0.99 microg/ml, respectively, for cell mortality at 24 and 48 hrs were observed, indicating a dose- and time-dependent response with regard to the cytotoxic effects of potassium dichromate. A statistically significant increase in the concentration of malondialdehyde [MDA], an indicator of lipid peroxidation, was recorded in exposed cells [15.9 - 69.9 microM] compared to control [13 microM]. Similarly, a strong dose-response relationship (p<0.05) was also obtained with respect to potassium dichromate induced DNA damage (comet assay) in HepG2 cells exposed [3.16 +/- 0.70 - 24.84 +/- 1.86 microns - mean comet tail length]; [12.4 +/- 1.45% - 76 +/- 1.49%-% tail DNA] to potassium dichromate than control [3.07 +/- 0.26 microns--mean comet tail length]; [2.69 + 0.19%-% Tail DNA], respectively. The results demonstrated that potassium dichromate was highly cytotoxic to HepG2 cells, and its cytotoxicity seems to be mediated by oxidative stress and DNA damage.
107 citations
TL;DR: The concentrations determined from the solvent extraction-dichromate oxidation methods were remarkably similar to those of gas chromatography in which samples were prepared from seven experiments, such as four batch cultures and three fed-batch fermentations.
Abstract: A method for measuring the ethanol concentration in a yeast culture broth was developed using both microtubes and a 96-deepwell microplate. The strategy involved first the solvent extraction of ethanol from the yeast culture broth and measurements of the ethanol concentration using the dichromate oxidation method. Particular focus was made on selecting the extraction solvent as well as determining the measurable range of ethanol concentrations using this solvent extraction-dichromate oxidation method. This method was developed as an assay format in 2.0-ml microtubes and 1.2-ml 96-deepwell microplates, and the ethanol concentration in the batch cultures and fed-batch fermentations was measured. Tri-n-butyl phosphate [non-alcoholic solvent, density = 0.9727, solubility in water = 0.028% (w/v)] was used for solvent extraction when measuring the ethanol concentration from the yeast culture broth. The maximum detectable ethanol concentration was 8% (v/v) when 10 g potassium dichromate in 100 ml of 5 M sulfuric acid was used. The concentrations determined from the solvent extraction-dichromate oxidation methods were remarkably similar to those of gas chromatography in which samples were prepared from seven experiments, such as four batch cultures and three fed-batch fermentations.
105 citations
TL;DR: In this paper, a method is described for the rapid screening of water-soluble corrosion inhibitors, which involves a fixed potential being applied between identical electrodes while immersed in an inhibitor solution, and the electrochemical response of the anodic and cathodic reactions, with and without the inhibitor, is then compared.
90 citations
TL;DR: Spectroscopic data show that both dichromate and chromate bind in similar electrostatic fashion to BSA and does not follow the fluorescence quenching observation for chromium (III).
Abstract: In the present work, the interactions of bovine serum albumin (BSA) with chromium (III) chloride, potassium dichromate, and chromate were studied by fluorescence, circular dichroism, and UV-vis absorbance spectroscopy. Fluorescence quenching of BSA by chromium (III) was found to be a dynamic process in the beginning, turning static at later stages. Spectroscopic data show that both dichromate and chromate bind in similar electrostatic fashion to BSA and does not follow the fluorescence quenching observation for chromium (III).
61 citations
TL;DR: The study suggests that PYC is effective in preventing K2Cr2O7-induced oxidative mediated nephrotoxicity, but more studies are needed to confirm the effects of PYC as a nephroprotective agent.
53 citations
TL;DR: It is suggested that vitamin E exerts its protective effect against nickel and/or chromium induced toxicity by preventing lipid peroxidation and protecting antioxidant system in the mouse ovary.
42 citations
TL;DR: In this paper, a set of plants were supplied with 100 and 400 μM Cr6 + (potassium dichromate, K2Cr2O7), superimposed over the complete nutrient solution (control).
Abstract: Spinach (Spinacea oleracea L. cv. ‘Banarasi’), known to be responsive to potentially toxic elements, was investigated for chromium (Cr6 +) effect on iron metabolism and water relations. After 40 days growth in sand culture, a set of plants was supplied with 100 and 400 μM Cr6 + (potassium dichromate, K2Cr2O7), superimposed over the complete nutrient solution (control). Excess Cr6 + produced visual symptoms of toxicity and increased accumulation of Cr, more in roots than in leaves. Decreased concentration of chlorophylls and the activities of heme enzymes, catalase and peroxidase in excess Cr6 + may suggest interference of Cr in iron metabolism of plants. These changes associated with decrease in iron (Fe) accumulation in Cr6 + treated plants, indicate that by reducing absorption of Fe, Cr6 + impairs the Fe requiring steps of chlorophyll and heme biosynthesis. In spite of lower water saturation deficit, the leaves of Cr6 + treated plants showed a decrease in leaf water potential, associated with i...
37 citations
TL;DR: It is demonstrated that dichromate has different sites of inhibition which are associated with photosystem II, photosystem I and electron transport sink beyond photosystems, and energy dissipation via photoystem I was limited by its electron acceptor side.
Abstract: In this study, we investigated the energy dissipation processes via photosystem II and photosystem I activity in green alga Chlamydomonas reinhardtii exposed to dichromate inhibitory effect. Quantum yield of photosystem II and also photosystem I were highly decreased by dichromate effect. Such inhibition by dichromate induced strong quenching effect on rapid OJIP fluorescence transients, indicating deterioration of photosystem II electron transport via plastoquinone pool toward photosystem I. The decrease of energy dissipation dependant on electron transport of photosystem II and photosystem I by dichromate effect was associated with strong increase of non-photochemical energy dissipation processes. By showing strong effect of dichromate on acceptor side of photosystem I, we indicated that dichromate inhibitory effect was not associated only with PSII electron transport. Here, we found that energy dissipation via photosystem I was limited by its electron acceptor side. By the analysis of P700 oxido-reduction state with methylviolagen as an exogenous PSI electron transport mediator, we showed that PSI electron transport discrepancy induced by dichromate effect was also caused by inhibitory effect located beyond photosystem I. Therefore, these results demonstrated that dichromate has different sites of inhibition which are associated with photosystem II, photosystem I and electron transport sink beyond photosystems.
35 citations
TL;DR: The proposed method was based on the special oxidation reaction between non-fluorescent SRBH by potassium dichromate to produce a highly fluorescent rhodamine B, as a product, and successfully applied to the determination of chromium (VI) in drinking water, river water and synthetic samples.
28 citations
TL;DR: The results demonstrate a Cr-specific action in altering several photosynthetic proteins, such as ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), RuBISCO activase, Light Harvesting Chla/b protein complex, and stress related Chla-b binding protein1.
Patent•
09 Dec 2009
TL;DR: A waterglass waterproof agent comprising of sodium silicate, potassium dichromate, copper sulfate, ferrous sulphate and water was described in this article, which has reasonable formulation and excellent waterproofing effect.
Abstract: The invention discloses a waterglass waterproof agent, comprising sodium silicate, potassium dichromate, copper sulfate, ferrous sulphate and water The invention has reasonable formulation and excellent waterproofing effect
TL;DR: Evaluation of changes in surface marker expression induced in dendritic cells (DC) or DC surrogate cell lines following exposure to chemicals represents one approach for in vitro test methods.
Abstract: Background: Evaluation of skin sensitization potential is an important part of the safety assessment of cosmetic ingredients and topical drugs. Recently, evaluation of changes in surface marker expression induced in dendritic cells (DC) or DC surrogate cell lines following exposure to chemicals represents one approach for in vitro test methods.
Objective: The study aimed to test the change of expression patterns of surface markers on THP-1 cells by chemicals as a predictive in vitro method for contact sensitization.
Methods: We investigated the expression of CD54, CD86, CD83, CD80, and CD40 after a 1-day exposure to sensitizers (1-chloro-2,4-dinitrobenzene; 2,4-dinitrofluorobenzene; benzocaine; 5-chloro-2-methyl-4-isothiazolin-3-one; hexyl cinnamic aldehyde; eugenol; nickel sulfate hexahydrate; potassium dichromate; cobalt sulfate; 2-mercaptobenzothiazole; and ammonium tetrachloroplatinate) and non-sensitizers (sodium lauryl sulfate, benzalkonium chloride, lactic acid, salicylic acid, isopropanol, and dimethyl sulphoxide). The test concentrations were 0.1×, 0.5×, and 1× of the 50% inhibitory concentration, and the relative fluorescence intensity was used as an expression indicator.
Result and Conclusion: By evaluating the expression patterns of CD54, CD86, and CD40, we could classify the chemicals as sensitizers or non-sensitizers, but CD80 and CD83 showed non-specific patterns of expression. These data suggest that the THP-1 cells are good model for screening contact sensitizers and CD40 could be a useful marker complementary to CD54 and CD86.
TL;DR: It is postulate that the administration of garlic can prevent nickel II- or chromium VI-induced alterations in blood glucose homeostasis while exerting a hepatoprotective effect on glycogen levels and antioxidant status in male albino rats.
Abstract: Garlic (Allium sativum) has a profound effect in reducing plasma glucose and increasing serum insulin in diabetic rats. We studied the effect of a garlic extract on nickel- or chromium-induced alteration of plasma glucose and hepatic glycogen levels and anti-oxidant status in rats. Adult male albino rats (n=36) divided into six groups of six animals each were treated as follows: Group I, untreated controls; Group II, fresh aqueous homogenate of garlic; Group III, nickel sulfate; Group IV, nickel sulfate + garlic; Group V, potassium dichromate; Group VI, potassium dichromate + garlic. In Groups IV and VI, the simultaneous administration of garlic abrogated a significant nickel- or chromium-induced increase in plasma glucose and decrease in liver glycogen. Nickel and chromium alone also increased lipid peroxide (LPO) and decreased glutathione levels, as well as the activity of superoxide dismutase (SOD), catalase, and glutathione peroxidase. Simultaneous garlic administration significantly reduced the LPO level and remarkably improved SOD activity. Hence, we postulate that the administration of garlic can prevent nickel II- or chromium VI-induced alterations in blood glucose homeostasis while exerting a hepatoprotective effect on glycogen levels and antioxidant status in male albino rats.
TL;DR: The results showed that the effects of chromium are dose-dependent and chromium was found to affect all the studied parameters.
TL;DR: According to case reports, chromated metal products, such as screws, fittings, etc., may be relevant allergen sources for patients sensitized to chromate.
Abstract: Background: Hidden allergen exposure may contribute to persistence and relapse of chromate dermatitis. According to case reports, chromated metal products, such as screws, fittings, etc., may be relevant allergen sources for patients sensitized to chromate.
Objectives: To examine concomitant patch test reactivity to potassium dichromate 0.5% petrolatum (pet.) and three different types of chromated metal rings.
Patients/Methods: Patients with proven or suspected chromate allergy were patch tested with potassium dichromate 0.5% pet. and three different types of chromated metal rings (yellow, olive, and black). Hexavalent chromium Cr(VI) release from the patch tested rings was chemically analysed.
Results: Ninety-five patients were tested: 49/95 (52%) reacted to potassium dichromate and 25/95 (26%) reacted to black chromated rings. Reactions to chromated rings exclusively occurred in patients reacting to potassium dichromate. Of 20 patients with a strong reaction to potassium dichromate, 14 reacted to black chromated rings. These were shown to have a high Cr(VI) release. Only two patients reacted to the other chromated rings, which had a very low Cr(VI) release.
Conclusions: Handling chromated metal products must be regarded a hazard to chromate-sensitive patients, in particular those with a strong sensitization.
TL;DR: Eight protein spots, corresponding to cutaneous enzymes involved in energy metabolism and chaperon proteins, were associated with skin cytotoxicity, immunity, and carcinogenesis and may provide a promising tool for developing therapeutic strategies and can serve as the basis for further research.
Abstract: Chromium compounds are known to be associated with cytotoxicity and carcinogenicity when applied via a skin route. The aim of this study was to evaluate the skin permeability and toxicological profiles of four chromium species. Chromium permeation across the skin, as determined by an in vitro Franz cell, decreased in the order of sodium chromate>potassium chromate>potassium dichromate>chromium nitrate. The uptake of chromium species within the skin generally showed a contrary trend to the results of permeation, although differences among the various compounds were not large. Levels of in vivo skin deposition of the four compounds showed no statistically significant differences. Potassium chromate produced the greatest disruption of the skin structure as determined by HE staining, followed in order by sodium chromate, potassium dichromate, and chromium nitrate. This indicates that hexavalent chromium elicited greater toxicity to the skin compared to trivalent chromium. A similar result was observed for the viability of skin fibroblasts. To improve our understanding of the molecular mechanisms leading to functional changes in proteins, proteomic tools, including 2-DE and MS techniques combined with sequence database correlations, were applied to identify target proteins altered by pathologic states. Eight protein spots, corresponding to cutaneous enzymes involved in energy metabolism and chaperon proteins, which were identified and discussed in this study, were associated with skin cytotoxicity, immunity, and carcinogenesis. In addition, functional proteomics of skin tissues may provide a promising tool for developing therapeutic strategies and can serve as the basis for further research.
Patent•
11 Nov 2009
TL;DR: In this article, the authors proposed a coal gangue catalytic combustion additive, which comprises the following components of waste residue from potassium dichromate production, waste residues from sodium dichromates production, sodium aluminosilicate, ferrocene, ferric oxide, magnesium silicate, potassium permanganate, sodium dodeeyi benzene sulfonate, ammonium bicarbonate, industrial sodium chloride, rare earth elements, sodium carbonate, and plant debris.
Abstract: The invention provides a coal gangue catalytic combustion additive. The additive comprises the following components of waste residue from potassium dichromate production, waste residue from sodium dichromate production, sodium aluminosilicate, ferrocene, ferric oxide, magnesium silicate, potassium permanganate, sodium dodeeyi benzene sulfonate, ammonium bicarbonate, industrial sodium chloride, rare earth elements, sodium carbonate, sodium nitrate and plant debris. The invention has the characteristics of catalytical combustion-supporting, sulfur fixing and coal gangue net calorific value combustion improving, enables the coal gangue to be sufficiently burnt and reduces the emissions of the harmful gas.
Journal Article•
TL;DR: In this paper, the authors constructed the mathematical mode of combined standard uncertainty in determination of the chemical oxygen demand in water by potassium dichromate method, with a case of high concentration, and analyzed and calculated exhaustively, then the result of detecting expanding uncertainty was gained.
Abstract: To construct the mathematical mode of combined standard uncertainty in determination of the chemical oxygen demand in water by potassium dichromate method,with a case of high concentration,the weight of B class uncertainty was analyzed and calculated exhaustively,then the result of detecting expanding uncertainty was gained.
TL;DR: In this paper, the results of a study of reduction and replacement of chromic acid from the etching solution were reported, showing that less aggressive solutions were effective in changing the surface and promoting metallic adhesion.
Abstract: In step-conditioning (etching) of acrylonitrile-butadiene-styrene (ABS) terpolymer, use is generally made of sulfuric/chromic acid solutions resulting in the generation of highly toxic, environmentally polluting waste. The present work reports the results of a study of reduction and replacement of chromic acid from the etching solution. The samples conditioning was carried out in baths containing solutions of chromic and sulfuric acids, potassium permanganate and phosphoric acid, and sulfuric acid, phosphoric acid and potassium dichromate, varying concentration, etching time and temperature. The morphology and structure of the samples surface were analyzed by scanning electron microscopy (SEM), roughness and infrared spectroscopy (FITR/ATR) and the adhesion quality of the metallized samples was evaluated by visual inspection, adhesion test and corrosion by a salt spray. The results show that chemical conditioning causes removal of ABS components of the samples surface, causing changes such as increased roughness and formation of pores and microcavities, which influenced the metallic adhesion and were dependent on the solution and the conditions employed. Chromic acid can be used in concentration smaller than 400 g.L-1 and less aggressive solutions were effective in changing the surface and promoting metallic adhesion.
TL;DR: Treatment with quercetin protected and prevented against the nephrotoxicity caused by Cr in rats, and it was observed that a single dose of potassium dichromate resulted in both an increase of systemic peroxidation of lipids and a decrease of the renal clearance of para-aminohippuric acid and inulin.
Abstract: It is well known that exposure to chromium (Cr) can lead to nephrotoxicity. Quercetin is a flavonoid of interest because of its proposed health-promoting effects. The aim of this work was to elucidate the role of quercetin against the nephrotoxicity caused by Cr in rats. Quercetin may have positive effects in combating, or helping to prevent, nephrotoxicity. It was observed that a single dose of potassium dichromate resulted in both an increase of systemic peroxidation of lipids and a decrease of the renal clearance of para-aminohippuric acid and inulin. Our results show that treatment with quercetin protected and prevented against these damaging effects.
TL;DR: In this article, the reaction of tris(ethylenediamine)nickel(II) dichloride dihydrate with potassium dichromate or potassium chromate results in the formation of mixed metallic compounds.
Abstract: The reaction of tris(ethylenediamine)nickel(II) dichloride dihydrate with potassium dichromate or potassium chromate results in the formation of mixed metallic compounds tris(ethylenediamine)nickel(II) dichromate [Ni(en)3][Cr2O7] (1) (en = ethylenediamine) and tris(ethylenediamine)nickel(II) chromate [Ni(en)3][CrO4] (2). Both compounds were characterized by analysis, spectra, magnetic susceptibility, and the structure of 1 was determined. [Ni(en)3][Cr2O7] (1) crystallizes in the centrosymmetric monoclinic space group P2(1)/c and its structure consists of a [Ni(en)3]2+ dication and a dichromate dianion, with all the atoms situated in a general position. Two carbons of one coordinated (en) in 1 and the hydrogens attached to the amine nitrogen in the same ligand are disordered over two positions. In the crystal structure, tris(ethylenediamine)nickel(II) cations are linked to the [Cr2O7]2− anions with several weak hydrogen bonding interactions resulting in an extended network. The χ versus T plots of 1 and 2 ...
Patent•
20 May 2009
TL;DR: In this article, an energy-saving coal combustion-supporting agent which is applicable to different types of coal-fired boilers and can inhibit the emissions of harmful substances of soot, sulfur dioxide and the like and a preparation method thereof is described.
Abstract: The invention relates to a coal combustion-supporting agent, in particular to an energy-saving coal combustion-supporting agent which is applicable to different types of coal-fired boilers and can inhibit the emissions of harmful substances of soot, sulfur dioxide and the like and a preparation method thereof. The combustion-supporting agent is prepared by five process steps of material weighing,ball-milling screening, pre-mixing, pre-dissolving and reaction packaging and by taking potassium chlorate, potassium chloride, potassium dichromate, potassium permanganate, potassium carbonate, cerium oxide and the like as raw materials, and the combustion-supporting agent is characterized by energy conservation and environmental protection.
Patent•
27 Mar 2009
TL;DR: In this article, a method of obtaining antibacterial textile fibre material consists of reduction of silver from an aqueous solution of silver nitrate with a reducing agent, in this case tannin and fixing the tanning agent on the fibrous material through soaking it in an aiquous solution with tartar emetic with a concentration of 0.5-1.5 wt %, separation from the aquequeous phase, after which the moist fibrous materials is put in an acid solution of salt nitrate of concentration 0.1-3.0 w
Abstract: FIELD: textiles. ^ SUBSTANCE: present invention pertains to textile fibre material production, containing antibacterial substances. Antibacterial textile fibre material is based on cotton or lint or silk or wool, 97.9-99.7 wt % and partially soluble inorganic salts of silver - 0.3-2.5 wt %. Method of obtaining antibacterial textile fibre material consists of reduction of silver from an aqueous solution of silver nitrate with a reducing agent, in this case tannin and fixing the tanning agent on the fibrous material through soaking it in an aqueous solution of tartar emetic with a concentration of 0.5-1.5 wt %, separation from the aqueous phase, after which the moist fibrous material is put in an aqueous solution of silver nitrate of concentration 0.1-3.0 wt % heated to 50-100°C, separated from the aqueous phase and dry the obtained fibrous material with the silver applied on it followed by treatment with an aqueous solution of sodium hypochlorite or potassium dichromate. ^ EFFECT: invention makes it possible to increase in resistance to wet treatment of textile fibrous materials and expanding the colour range of antibacterial textile fibrous materials in towards light tones. ^ 4 cl, 5 ex
Patent•
03 Jun 2009
TL;DR: In this paper, a halogen-free digestion solution is used to determine the chemical oxygen demand in sewage, and the silver sulfate is use for eliminating the interference of chloride by replacing poisonous drug mercury sulfate.
Abstract: The invention relates to a digestion solution for monitoring chemical oxygen demand in sewage, which is characterized in that active ingredients comprise 1L of potassium dichromate solution, 3L of 98% concentrated sulfuric acid, 0.1-0.3g of potassium chromate and 30-60g of silver sulfate, wherein, the concentration of the potassium dichromate solution is 0.05-0.07mol/l or 1.0-1.2mol/l. The invention has the beneficial effects that halogen-free digestion solution is used to determine the chemical oxygen demand in sewage, and the silver sulfate is use for eliminating the interference of chloride by replacing poisonous drug mercury sulfate. In addition, the solution can monitor standard water sample that CODcr value is between 0-150mg/l and 0-1500mg/l and the chloride is below 800mg/l. Therefore, the solution is applicable for sewage at sewage disposal factories in the majority of cities. With the wide use scope, the solution is environmental friendly and can reduce use cost. Without any mercury sulfate in the solution, the damage of the poisonous drug to operators is avoided, and the security of operation is improved.
Patent•
09 Sep 2009
TL;DR: In this article, a determination method of COD value in glass raw material is provided, which comprises the following steps of: heating the glass raw materials in potassium dichromate and mixed acid (mixed acid for mineral raw materials is prepared by sulphuric acid and phosphoric acid according to volume ratio of 4:1 and mixing of mixed acid for chemical raw materials was prepared by sulfurous acid and phosphorus according to 6:1; boiling and back flowing for 28 to 32min and calculating the COD values of all the raw materials according to conversion formula through titration
Abstract: The invention provides a determination method of COD value in glass raw material. The method comprises the following steps of: heating the glass raw material in potassium dichromate and mixed acid (mixed acid for mineral raw materials is prepared by sulphuric acid and phosphoric acid according to volume ratio of 4:1 and mixed acid for chemical raw materials is prepared by sulphuric acid and phosphoric acid according to volume ratio of 6:1; boiling and back flowing for 28 to 32min and calculating the COD values of all the raw materials according to conversion formula through titration of standard solution of ferrous ammonium sulphate. Aiming at the problem of long back flow time, complex operation and large reagent consumption and the like of the potassium dichromate, the invention provides a method for fast measuring the COD values of all the raw materials in glass by using mixed acid process. According to measured result, the invention can adjust the proportion of materials in time and realize the application of clarification technology of reducing sulfur in the glass preparation.
TL;DR: Results show that the administration of a single intraperitoneal dose of potassium dichromate decreased the activity of gamma-glutamyl transpeptidase and alanine aminopeptid enzyme enzymes in urine.
Abstract: It has been reported that potassium dichromate–induced nephrotoxicity is evidenced by diminution in creatinine clearance, increase in urinary protein, and structural damage to the proximal tubules. Damage to tissue often leads to the release of enzymes from the injured cells into the extracellular fluids. The aim of this study was to establish whether potassium dichromate induces changes in the urinary-specific activities of gamma-glutamyl transpeptidase and alanine aminopeptidase enzymes. Our results show that the administration of a single intraperitoneal dose of potassium dichromate decreased the activity of such enzymes in urine.
TL;DR: Ayni baslikli bir yuksek lisans tezi esas alinarak metinlestirilmistir no’lu proje kapsaminda gerceklestIRilmis olup, ayni Basbakanlik, Atom Enerjisi Enstitusu, Ankara TURKIYE.
Abstract: Summary The objective of this study was to evaluate a standard method for quantitative isolation of Eimeria oocysts from feces samples and effective sporulation. It’s realized that contamination related with litter can effectively impress the result about quantitative determination of oocyst existance in faeces taken from hencoops that lots of chickens live together. This negativity can be arranged by performing pre-separation process for newly collected samples and with this process related problem could be solved to a certain degree. In the experiments made for determining the ideal perspective about oocyst sporulation, oxygen, motion and potassium dichromate (K2Cr2O7) were emphasized and the importance of potassium dichromate understood again. Moreover the obtained data showed that different reasons about potassium dichromate’s action mechanism directly or indirectly could take part in sporulation.
TL;DR: In this paper, a new method for the determination of trace ethylenediaminetetraacetic acid (EDTA) was developed using catalytic kinetic spectrophotometry based on the principle that trace EDTA has a catalytic effect on the oxidation of rhodamine B by potassium dichromate, and a suitable amount of 6.0
Abstract: A new method for the determination of trace ethylenediaminetetraacetic acid (EDTA) was developed using catalytic kinetic spectrophotometry based on the principle that in the medium of 0.10 mol/L sulfuric acid, trace EDTA has a catalytic effect on the oxidation of rhodamine B by potassium dichromate, and a suitable amount of 6.0 mol/L NaOH solution can inhibit the catalytic reaction. At the maximum absorption wavelength of 546 nm, the linear range for the determination of EDTA was shown over the concentration range 5.0 × 10−5–7.0 × 10−4 mol/L and the detection limit of this method for EDTA was 0.0501 mmol/L. The linear regression equation for the determination of EDTA and regression coefficient were ΔA = 512C (C: mol/L) + 0.0966, γ = 0.9993, respectively. The apparent activation energy of the catalytic reaction was 81.57 KJ/mol. The proposed method has been successfully applied to the determination of trace ethylenediaminetetraacetic acid in water and apple tinned foodstuff samples with satisfactory result...