Showing papers on "Potassium iodate published in 2012"

A new spectrofluorometric method for the determination of total arsenic in sediments and its application to kinetic speciation

Abstract: A simple and sensitive spectrofluorometric method has been developed for the determination of arsenic (As) using rhodamine-B as a fluorescent agent. This method is based on the reaction of As(III) with potassium iodate (KIO3) in acid medium to liberate iodine, which decreases the fluorescence intensity of rhodamine-B. This decrease in intensity was used to quantify As(III). A linear decrease in the response was observed with the increasing As(III) concentrations. An R2 value of 0.995 was obtained. As(III) in the concentration range of 0.4 µg mL−1 to 12.5 µg mL−1 showed linearity and reproducibility by this method. The limit of quantitation was found to be 0.4 µg mL−1 of As(III) was the limit of quantitation. This method was successfully used to determine the total concentration of As in coastal and estuarine sediments. This study suggests that the estuarine sediments were more contaminated with As than the coastal sediments and the probable source of high As content in estuarine sediment is agricultural ...

Potassium iodide, but not potassium iodate, as a potential protective agent against oxidative damage to membrane lipids in porcine thyroid

Abstract: Fenton reaction (Fe2++H2O2→Fe3++•OH+OH−) is of special significance in the thyroid gland, as both its substrates, i.e. H2O2 and Fe2+, are required for thyroid hormone synthesis. Also iodine, an essential element supplied by the diet, is indispensable for thyroid hormone synthesis. It is well known that iodine affects red-ox balance. One of the most frequently examined oxidative processes is lipid peroxidation (LPO), which results from oxidative damage to membrane lipids. Fenton reaction is used to experimentally induce lipid peroxidation. The aim of the study was to evaluate effects of iodine, used as potassium iodide (KI) or potassium iodate (KIO3), on lipid peroxidation in porcine thyroid homogenates under basal conditions and in the presence of Fenton reaction substrates. Porcine thyroid homogenates were incubated in the presence of either KI (0.00005 – 500 mM) or KIO3 (0.00005 – 200 mM), without or with addition of FeSO4 (30 μM) + H2O2 (0.5 mM). Concentration of malondialdehyde + 4-hydroxyalkenals (MDA + 4-HDA) was measured spectrophotometrically, as an index of lipid peroxidation. Potassium iodide, only when used in the highest concentrations (≥50 mM), increased lipid peroxidation in concentration-dependent manner. In the middle range of concentrations (5.0; 10; 25; 50 and 100 mM) KI reduced Fenton reaction-induced lipid peroxidation, with the strongest protective effect observed for the concentration of 25 mM. Potassium iodate increased lipid peroxidation in concentrations ≥2.5 mM. The damaging effect of KIO3 increased gradually from the concentration of 2.5 mM to 10 mM. The strongest damaging effect was observed at the KIO3 concentration of 10 mM, corresponding to physiological iodine concentration in the thyroid. Potassium iodate in concentrations of 5–200 mM enhanced Fenton reaction-induced lipid peroxidation with the strongest damaging effect found again for the concentration of 10 mM. Potassium iodide, used in doses generally recommended in iodide prophylaxis, may prevent oxidative damage to membrane lipids in this gland. Toxic effects of iodide overload may result from its prooxidative action. Potassium iodate does not possess any direct beneficial effects on oxidative damage to membrane lipids in the thyroid, which constitutes an additional argument against its utility in iodine prophylaxis.

Preparation of polyaniline/activated carbon composite for removal of reactive red 198 from aqueous solution

Abstract: In this study, preparation of polyaniline (PAni) composite containing activated carbon and its capability to removal of reactive red 198 (RR198) from aqueous solution was studied. PAni was synthesized in the presence of potassium iodate (KIO3) as an oxidant and coated on prepared activated carbon. The removal of RR198 was investigated using PAni/activated carbon (PAni/AC) composite. The products were investigated in terms of morphology and chemical structure with scanning electron microscope (SEM). Batch studies were performed to evaluate the influence of various experimental parameters like pH, adsorbent dosage and contact time. Optimum conditions for RR198 removal were found to be pH 3, adsorbent dosage of 1 g/L and equilibrium time 60 minute.

Method for determining content of calcium carbonate in cigarette paper

Abstract: The invention discloses a method for determining the content of calcium carbonate in cigarette paper, which comprises the steps of: treating the cigarette paper to be determined with hydrochloric acid and distilled water and filtering, adding a potassium iodate aqueous solution and a potassium iodide aqueous solution into the filtrate for reaction; diluting with distilled water without carbon dioxide and analyzing with a spectrophotometer at wavelength of 352nm; and then drawing a standard curve and calculating to obtain the result. In the invention, the spectrophotometer is applied to determining calcium carbonate in cigarette paper for the first time. The recovery rate is 98.2-100.8% and variation coefficient range of continuous five-time determining results is 0.0031-0.40%. The inter-day variation coefficient range is 1.34%. There is no significant difference when comparing the determining result by national standard method with the result by the method of the invention. The methodis simple and convenient to operate, fast to analyze, and has high accuracy and precision, strong stability and good application prospect.

Spectrophotometry determination of Congo red in river water samples using nanosilver

Abstract: A spectrophotometric procedure for the anionic diazo dye Congo red was proposed based on nanosilver catalyzed oxidation by potassium iodate in a hydrochloric acid medium. The calibration graph is linear for 0.8–240 mg L−1, and the detection limit is 0.6 mg L−1. Most foreign ions do not interfere with the determination, except for Cu(II), Fe(III), and Cr(VI). The interferences of Cu(II) and Fe(III) could be eliminated by masking with ethylene diamine tetraacetate, and that of Cr(VI) by reducing to Cr(III) with ascorbic acid. The typical features of this procedure are that it is sensitive for Congo red, and the determination could be carried out at room temperature. It had been used for the determination of Congo red in the Ganjnameh river water sample.

Reagent used for detecting urinary iodine by biochemistry analyzer and urinary iodine detecting method

Abstract: The invention discloses a reagent used for detecting urinary iodine by a biochemistry analyzer and a urinary iodine detecting method. The reagent mainly comprises the following components: digestion solution-ammonium persulfate solution, reagent R1-arsenious acid or arsenic trioxide solution, reagent R2-ceric ammonium sulfate or cerous sulfate solution, and iodine standard solution-potassium iodide (sodium iodide) or potassium iodate (sodium iodate) solution. The detecting method mainly includes the following steps: selecting the detecting reagent, digesting urine sample, setting parameters of the biochemistry analyzer, and determining through the biochemistry analyzer. The detecting method has high automation degree, small human error, little reagent dosage and short detecting time. By adopting the biochemistry analyzer to analyze the urinary iodine, the urinary iodine detecting method expands the detecting items of the instrument, is particularly suitable for the medical organizations equipped with the biochemistry analyzers, and meets the requirements of clinical detection on quick issuing of result and detecting automation.

A catalytic kinetic spectrophotometric determination of organophosphorus pesticides in vegetable samples

Abstract: A simple selective and sensitive catalytic kinetic spectrophotometric method for the determination of trace amount of organophosphorus pesticides has been proposed. The method is based on the catalytic effect of organophosphorus pesticides (malathion, dimethoate and phorate) on the oxidation of LCV (leuco crystal violet) by potassium iodate in hydrochloric acid medium to give a violet colored dye. The dye shows maximum absorption at 592 nm. The fixed-time method was used for 15 min. The system obeys Beer’s law in the range of 0.02-0.2, 0.032-0.32 and 0.03-0.3 µg mL-1, for malathion, dimethoate, and phorate, respectively. Important analytical parameters such as time, temperature, reagent concentration, acidity etc, have been optimized for complete color reaction. Sandell’s sensitivity and molar absorptivity for the system were found to be 0.0002, 0.0004, 0.0004 µg cm-2 and 1.2 × 106, 5.21 × 105, 6.3 × 105 L mol-1cm-1, respectively. The proposed method was satisfactorily applied to micro-level determination of organophosphorus pesticides in vegetable samples.

Compound pharmaceutical composition of iodine polymer and glucocorticosteroid for treating dermatitis

Abstract: The invention relates to the field of medicinal preparation and relates to a compound pharmaceutical composition of iodine polymer and glucocorticosteroid for treating dermatitis. The pharmaceutical composition of the present invention comprises 0.01-5% of polyvinylpyrrolidone iodine, 0.01-10% of glucocorticosteroid, 0.001-0.5% of potassium iodate and the balance of pharmaceutically accepted carrier, wherein the glucocorticosteroid is fluticasone propionate or halometasone. Drug effect test has proved that the compound medicament can treat dermatitis by synergism; furtherly, addition of a certain proportion of potassium iodate overcomes unfavorable influences of drug effect decrease or auxiliary effect caused by medicament instability.

The stability of micronutrients in fortified food stuffs after processing and storage: Iodine in salt and iron in wheat flour

Abstract: Salt was fortified by potassium iodate in the level 66 mg/kg of salt with wet method of fortification. Then the iodized salt was stored using three packaging materials; low density polyethylene (LDPE), high density polyethylene (HDPE) and woven high density polyethylene (WHDPE) at two conditions: room temperature (20-25°C) and medium RH (50-60%) for about 6 months and accelerated temperature (40°C) and high Relative Humidity (RH) (70-100%) for about 18 days. Generally, the amount of iodine decreased with time (p 0.05). When the amount of iron was evaluated after processing (baking bread), the result was found to be non-significantly different. In addition, the sensory quality scores of the 30 and 40 ppm iron fortified bread were above moderately liked scale and were not different from the bread made from the control. Key words: Fortification, salt, wheat flour, micronutrients, iron, iodine, storage, relative humidity, temperature, packaging materials, processing, sensory evaluation.

Method and device for testing content of sulfur in iron ore

Abstract: The invention relates to a method testing content of sulfur in iron ore, which comprises the steps of: enabling air to pass through a concentrated sulfuric acid liquid I with a concentration range of 96-98 percent and a concentrated sulfuric acid liquid II with a concentration range of 96-98 percent, wherein 5-8g of potassium dichromate is dissolved in the concentrated sulfuric acid liquid II; then reacting with sulfur under high temperature to generate a sulfur dioxide gas; absorbing the sulfur dioxide gas with acidic starch and titrating with a potassium iodate standard solution; and figuring out the mass fraction of the sulfur according to the volume of the consumed potassium iodate standard solution. Compared with the prior art, the invention has the advantages that air passes throughthe concentrated sulfuric acid and the potassium dichromate-sulfuric acid, water vapor and carbon dioxide in air can be effectively removed, air is convenient for taking and has low cost, oxygen is much expensive relative to air, air is used as a gas source, and safety factor of air is improved relative to oxygen as the gas source.

All-Solid-State Iodide Selective Electrode for Iodimetry of Iodized Salts and Vitamin C

Abstract: A laboratory-made all-solid state iodide selective electrode, with Ag 2 S-AgI coated on a graphite rod recovered from dry cell battery, was prepared according to previous procedures. The electrode’s linear response to iodide was in the concentration range of 10-6 M to 10-1 M with a slope of 56.85 mV/decade and a detection limit of 6×10 -7 M. Iodate recovery test for laboratory formulated iodate-iodized salt was found to be 98.6 % with a standard deviation of 1.14%. The titratability of the iodized salt solution was at least 10-200 ppm potassium iodate (6-120 ppm iodine), exhibiting distinct endpoints in the range wider than the ones set in regulatory standards and reflecting that QC monitoring in production and stability decline of iodine content upon storage can be performed with the electrode method. On the basis this potentiometric titration, the application of the laboratorymade iodide electrode (vs. a saturated calomel reference electrode) was extended to the determination of iodine in commercial iodized salts. In all the iodine assays, the iodate-iodized salt was initially treated with acid and an excess of iodide before titration against Na 2 S 2 O 3 solution. The iodine content in table salts iodized with iodide was determined by direct potentiometry. The electrode was further used for vitamin C (ascorbic acid) determinations in pharmaceutical tablets and orange juice by back titrating excess I3 against standard Na2S2O3 in acidic media. The overall outcome is that the iodide ISE can be used as sharp endpoint indicator for these titrimetric reactions in place of the well known official, but visually monitored, starch- triodide end-point reaction detection.

Iodisation of Lake Katwe Salt, Kasese District

Abstract: The raw rock salt was analysed for its chemical composition in terms of selected chemical species. It exhib- ited a large quantity of chemical impurities with sulphate at 20.7% w/w, carbonate 31.7 %, magnesium 945 ppm, iron 168 ppm, calcium 74 ppm and zinc at 18 ppm with chloride anion at 1.54% w/w. Titrimetry was used for determination of chloride and carbonates, sulphate was determined gravimetrically. ASS was used for determination of cations. Several methods were used for purification of the raw salt namely; fractional crystallization, precipitation with barium chloride, sodium state, potassium permanganate and ammonium sulphide. The purified salt had the following composition; carbonate 1.42% w/w, sulphate 3.83% chloride 50% w/w, iron 7.4±0.25, magnesium 7.64±0.20, calcium 4.40±0.30 and zinc 4.22±0.15. The refined salt was iodised at 100ppm by addition of (0.0356g) potassium iodate to 200 g salt. The level of the added iodine was determined by iodometric titration. It was found constant for two weeks (the experimental period).

Preparation method for L-(+)-tartaric acid

Abstract: The invention discloses a preparation method for L-(+)-tartaric acid, relating to the field of chemical synthesis The invention uses maleic anhydride as raw material and performs oxidization reaction on the maleic anhydride by a composite oxidant of potassium iodate and iodine in the presence of a catalyst, and performs a hydrolysis reaction in the presence of strong acid to obtain the L-(+)-tartaric acid The preparation method provides a new way to directly prepare chiral L-(+)-tartaric acid through a selective oxidation reaction, wherein reaction conditions in all steps are easy to operate, and the technology is simple, and reactions in all steps are of comparatively normal operation In addition, the preparation method avoids using particular requirements on strain cultivation and use in the biological method, and lowers the cost of the product

Technology for producing high protein feed by straws

Abstract: The present invention belongs to the straw reutilization technology. The technology of the present invention is that: the feed comprises: 44% of calcium oxide, 38% of sodium chloride, 9% of sodium bicarbonate, 5% of urea, a proper amount of white sugar, and 0.5% of trace elements, wherein the trace elements are selected from the easily-obtained inorganic compound, the inorganic compound comprises, by weight, 7% of manganese dioxide, 12% of zinc sulfate, 7% of cobalt chloride, 19% of potassium iodate, 9% of ferrous sulfate, 21% of potassium dihydrogen sulphate, 16% of sodium sulfate, and 9% of disodium pentoxide.

Oxidation and reduction of 1,1′-[3-(methylsulfanylmethyl)tetrahydro-2H-thiopyran-3,5-diyl]diethanone

Abstract: Oxidation of 1,1′-[3-(methylsulfanylmethyl)tetrahydro-2H-thiopyran-3,5-diyl]diethanone with equivalent amounts of potassium iodate in glacial acetic acid and hydrogen peroxide in tetrahydrofuran and chloroform gave the corresponding mono- and disulfoxides and disulfone, respectively. Reactions of the title compound with sodium tetrahydridoborate and hydroxylamine hydrochloride afforded mono- and dihydroxy derivatives and monooxime, respectively.

Process for removing sulfides from brine

Abstract: The invention provides a process for removing sulfides from brine. According to the method, stable chlorine dioxide activated by a chlorine dioxide activating agent is used for removing gaseous H2S and combined H2S substances from the raw material brine, so that the sulfides can be removed at normal temperature, and the sulfide removal effect can be enhanced at high temperature; the reaction is irreversible, so that reducing substances do not exist during the whole iodine salt production, and the situation that the iodine salt is turned to be red or blue by iodide ions reduced from potassium iodate can be avoided; and the quality of the iodine salt is stable.

Compositions for preparing aqueous solutions used for treating mucous coat of nasal cavity, nasopharynx, oral cavity and throat,

Abstract: The invention relates to chemico-pharmaceutical industry, in particular, to compositions for treating mucous coats of nasal cavity, nasopharynx, oral cavity and throat. The first embodiment comprises sodium chloride (halite), sodium bicarbonate (soda), a dry extract of rosehips, a dry extract of licorice roots, an iodine salt (potassium iodite or potassium iodate), sulfate magnesium (Epsom salt), potassium chloride (sylvite). Another embodiment of a composition comprises sodium chloride (halite), sodium bicarbonate (soda), roots, an iodine salt (potassium iodite or potassium iodate), a dry extract of inula roots, a dry extract of Saint-John's worth, a dry extract of milfoil. The invention permits to clean nasal cavity more effective and provides anti-inflammatory and antiseptic effect in all mucous coats of nasal cavity.

New Nonlinear Optical Potassium Iodate K[IO3] and Borates K3[B6O10]Br, KTa[B4O6(OH)4] (OH)2·1.33H2O — Synthesis, Structures and Relation to the Properties.

Abstract: Three optically uniaxial non-centrosymmetric potassium compounds, iodate K[IO3] and two borates K3[B6O10]Br, KTa[B4O6(OH)4](OH)2·1.33H2O have been synthesized and characterized by single-crystal X-ray diffraction. The materials were synthesized through hydrothermal techniques using initial reagents and mineralizers. All the compounds are trigonal-hexagonal: the space groups are R3 (K[IO3]), R3m (K[B6O10]Br) and P-62m (KTa[B4O6(OH)4](OH)2·1.33H2O). Powder second-harmonic generation (SHG) measurements on crystals, using 1064 nm Nd:YAG laser radiation, indicate the materials are all phase-matchable and have strong second-order nonlinearities. The correlation with the perovskite structure has been found and described for K,Br-borate and K-iodate. Structure-properties relation is discussed and attributed to stereo-active lone-pair on I5+ and asymmetrical bonds in the compounds. The role of K atoms is pronounced from crystal chemistry point of view, contributing optical nonlinearities.