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Showing papers on "Potassium dichromate published in 1967"


Journal ArticleDOI
TL;DR: The rise in beta-glucosidase activity was associated with the appearance of a new urinary enzyme species, which appears to be identical with its counterpart in the kidney, and it is suggested that it arises in the urine as a result of renal tubular breakdown.
Abstract: 1. The activities of β-galactosidase, β-glucosidase, β-glucuronidase and N-acetyl, β-glucosaminidase were estimated in normal and pathological rat urine, with 4-methylumbelliferyl glycosides as substrates. 2. Kidney damage induced by injections of uranium nitrate, mercuric chloride, potassium dichromate or 4-nitrophenylarsonic acid causes a marked increase in the urinary excretion of all four enzymes. 3. The rise in β-glucosidase activity was associated with the appearance of a new urinary enzyme species, which was examined by starch-gel electrophoresis, DEAE-cellulose chromatography and filtration on Sephadex G-75 and G-200. 4. This enzyme appears to be identical with its counterpart in the kidney, and it is suggested that it arises in the urine as a result of renal tubular breakdown. 5. The other glycosidases examined also show some physical similarities to the corresponding enzymes of the rat kidney.

64 citations


Journal ArticleDOI
TL;DR: It is concluded that carboxyl and phosphoryl residues in tissue bind chromic (and iron) ions, which are then converted by heating to an unreactive insoluble form.
Abstract: On exposure of formol or methanol chloroform fixed sections to solutions of 2.5–5% potassium dichromate or 4.2% chromic acetate for 18 hours at 60° C a strong relative oxyphilia develops. As measured with buffered solutions of azure A eosin B the point at which various tissue elements pass from red to blue staining is elevated by 3 to 4 pH units. A similar change occurs in K2Cr2O7 in about 21 days at 24° C and at 4° C only a slight elevation of protein pK appears in 6 weeks. Ferric chloride and ferrous sulfate solutions of comparable metal content produce a less marked shift (about 2 pH units) and relatively slight similar action is produced by aluminium and copper salts (about 1 pH unit). Heating in water, NaCl, KH2PO4 and K2CrO4 solutions is without effect. The effect is similar to that of methylation on phosphoric and carboxylic acid sites, and combination of the two procedures is not additive. Mast cell and cartilage staining are not significantly affected. Deoxyribonucleic acid is not extracted; the Feulgen reaction persists, though 1 hour hydrolysis is required vs 12–15 minutes on control formol material. Metal binding as revealed by staining in acetic hematoxylin remains demonstrable after 10 days heating in 2.5% K2Cr2O7, but disappears in 6–16 hours in chromic, ferric and ferrous salt solutions. Chemical analysis reveals the continued presence of chromium at 4–5 % dry weight levels in liver and brain, alike after chromic acetate and potassium dichromate (24 hours, 60° C), though no histochemical Cr demonstration is obtained after Cr acetate. It is concluded that carboxyl and phosphoryl residues in tissue bind chromic (and iron) ions, which are then converted by heating to an unreactive insoluble form. Removal of demonstrable chromium with acid alcohol, sodium dithionite or s-mercaptoethanol from dichromate treated tissues does not reverse the oxyphilia.

7 citations


Journal ArticleDOI
01 Feb 1967-Talanta
TL;DR: A highly precise method is described for the determination of plutonium by constant-current potentiometric titration with primary standard potassium dichromate.

7 citations


Journal ArticleDOI
01 Feb 1967-Talanta
TL;DR: A procedure is described for very precise determination of uranium in high-purity uranium and uranium compounds using constant-current coulometry.

6 citations


Journal ArticleDOI
G.Gopala Rao1, P K Rao1
01 Jan 1967-Talanta
TL;DR: Vanadium(IV) can be accurately titrated with potassium dichromate in media containing phosphoric acid of 3-12M concentration: the change in absorption of vanadium( IV) is followed in the region 660 mmicro using a red filter.

4 citations


Patent
06 Nov 1967
TL;DR: In this article, a cohesive body is formed with a cavity, in which a priming composition is deposited from an aqueous suspension, and the grains of nitrocellulose can be dry blended with ignition and combustion modifiers such as graphite, potassium nitrate, potassium dichromate, potassium sulphate, lead chromate, strontium peroxide, barium perox, nitroguanidine, aminotetrazole, PETN, TNT, RDX, red phosphorus, nitroaminoguanidine and nitrostarch.
Abstract: 1,212,615. Moulding plastic substances. OLIN CORP. 13 Sept., 1968 [6 Nov., 1967], No. 43633/68. Heading B5A. [Also in Divisions C1 and F3] Fibrous grains of nitrocellulose are interlocked under pressure to form a cohesive body 1, by dry compacting the grains under a pressure of 3,500 p.s.i. to 75,000 p.s.i. without the addition of a binder, plasticizer and/or solvent. The body is formed with a cavity 5 in which a priming composition 4 is deposited from an aqueous suspension. The grains of nitrocellulose can be dry blended with ignition and combustion modifiers such as graphite, potassium nitrate, potassium dichromate, potassium sulphate, lead chromate, strontium peroxide, barium peroxide, nitroguanidine, aminotetrazole, PETN, TNT, RDX, red phosphorus, nitroaminoguanidine and nitrostarch.

4 citations


Journal ArticleDOI
TL;DR: The simple titrimetric procedure described in this paper is based on acid hydrolysis of chloramphenicol and quantitative oxidation of the product by potassium dichromate in one step.
Abstract: The simple titrimetric procedure to be described is based on acid hydrolysis of chloramphenicol and quantitative oxidation of the product by potassium dichromate in one step.

4 citations


Journal ArticleDOI
TL;DR: In this article, a convenient and reliable analytical method for the determination of the dichromate value of sewage and trade effluents is described. But the method is more rapid than existing macro-scale procedures and is sufficiently analytically accurate and reproducible for the calculation of trade-waste treatment charges.
Abstract: A description is given of a convenient and reliable analytical method for the determination of the dichromate value of sewage and trade effluents. The method is more rapid than existing macro-scale procedures and is sufficiently analytically accurate and reproducible for the calculation of trade-waste treatment charges. Oxidation with potassium dichromate is carried out in boiling 50% (vol./vol.) sulphuric acid, with a total reagent volume of 30 ml.

3 citations


Journal ArticleDOI
TL;DR: Two analytical techniques are described which have been adapted to industrial hygiene purposes for determining microgram quantities of airborne vapors of diethanolamine, 2-methylaminoethanol, and 2-diethylaminoethylene, and a pink color is determined spectrophotometrically.
Abstract: Two analytical techniques are described which have been adapted to industrial hygiene purposes for determining microgram quantities of airborne vapors of diethanolamine, 2-methylaminoethanol, and 2-diethylaminoethanol. The first two of these materials are secondary amines, and are oxidized with potassium dichromate; the residual unreduced dichromate is then reacted with 1,5-dipheuylcarbohydrazide to form a pink color which is determined spectrophotometrically. The 2-diethylaminoethanol, a tertiary amine, is collected in water, extracted with ethylene dichloride, and then reacted with methyl orange to form a complex which breaks up in acid solution to again produce a color which may be read on a spectrophotometer.

3 citations


Journal ArticleDOI
TL;DR: The preliminary tests for organic radicals, which are based on charring by strong heating or by hot concentrated sulphuric acid are examined in this paper, and two alternative procedures based upon oxidation of organic matter with potassium dichromate in dilute sulphurics have been examined.
Abstract: The preliminary tests for organic radicals, which are based on charring by strong heating or by hot concentrated sulphuric acid are examined. Even when both these tests are applied some organic acids escape identification. Two alternative procedures based upon oxidation of organic matter with potassium dichromate in dilute sulphuric have been examined. The first procedure involves a reduction of the dichromate ion to the distinctive green chromium(III) ion. This occurs with all organic radicals commonly encountered in qualitative inorganic analysis, except acetate and salicylate. Interference due to inorganic reducing agents is overcome by a preliminary oxidation with hydrogen peroxide. The second procedure involves decomposition of carbonates, bicarbonates, and cyanates with dilute sulphuric acid, followed by oxidation of organic matter with potassium dichromate in sulphuric acid to carbon dioxide, which is detected with lime water. Of the radicals commonly encountered in qualitative inorganic analysis only acetate gives a negative result.

1 citations


Patent
08 Aug 1967
TL;DR: A carboxylic acid can be prepared from olefinically unsaturated compounds, carbon monoxide, and water at elevated temperature in the presence of palladium and/or a palladium compound and an oxidizing agent with an oxidation potential of more than 0A1 volt.
Abstract: 1,137,163 Carboxylic acids BADISCHE ANILIN- & SODA-FABRIK AG 15 April, 1966 [17 April, 1965], No 16559/66 Heading C2C Carboxylic acids are prepared from olefinically unsaturated compounds, carbon monoxide, and water at elevated temperature in the presence of palladium and/or a palladium compound and an oxidizing agent with an oxidation potential of more than 0A1 volt, at from 30‹ to 210‹ C Unsaturated compounds may be ethylene, vinyl chloride, propene, butene-(2), hexene-(3), dodecene-(1), 2-ethylhexene-(1), propenylbenzene, vinylcyclohexene-(3), cyclohexene, cyclooctene, cyclododecene, butadiene-(1,3), isoprene, piperylene, cyclooctadiene-(1,5), octatriene- (2,4,6), methylheptatriene, cycloheptatriene- (1,3,5), cyclododecatriene - (1,5,9), 1 - chlorocyclododecadiene - (5,9), cyclooctatetraene, ethyl acrylate, acrylonitrile, acrylamide, allyl alcohol, allyl chloride, oleic acid, ricinoleic acid, undecylenic acid, methyl allyl ether, cyclohexadienes and acrolein The oxidizing agent may be iodine, peroxides, persulphates, lead dioxide, manganese dioxide, copper (II) chloride, potassium permanganate, potassium dichromate, benzoquinone, oxygen, or the oxidation may be by electro-chemical means with an anode at the appropriate potential Examples describe the preparation of propionic acid, cyclododecadiene- (5,9)-monocarboxylic acid-(1) which may be hydrogenated to cyclododecane monocarboxylic acid, and butene-(2) carboxylic acid-(1)

Patent
07 Jun 1967
TL;DR: Kuhlmann et al. as mentioned in this paper proposed a method for depilating and tanning a skin using an aqueous liquid containing at least 10 g. acid per litre of an alkali metal dichromate.
Abstract: 1,186,897. Depilating and tanning. UGINE KUHLMANN. June 8, 1967 [June 8, 1966], No. 26413/67. Heading C6C. In depilating a skin, it is treated with an aqueous acidic liquor containing at least 10 g. per litre of an alkali metal dichromate, e.g. sodium or potassium dichromate, and at least one strong mineral acid, e. g. hydrochloric, nitric, sulphuric or perchloric acid. The acidic liquor may contain more than 6 g. acid per litre. Depilation may be effected by dissolving the dichromate in water, adding the acid or acids and then the skin. After acting on the skin, the acidic liquor may be drained off i. e. recovered, filtered and mixed with suitable known reducing agents and used for chrome-tanning the depilated skin, as mentioned below. The treated skin may be subjected to further depilation treatment with an aqueous caustic alkali, e.g. an aqueous caustic soda solution, to effect complete dissolution of the hairs. Before said further depilation treatment, the skin may be rinsed with brine, or treated with an aqueous solution of an organic tanning agent, such as quinone or formaldehyde, to protect the hair side of the skin. After the further depilation treatment with aqueous caustic alkali, the skin may be treated with aqueous ammonium sulphate and chrome-tanned with the above-mentioned recovered and reduced liquor. The skin, immediately after having been treated with the acidic depilating liquor, may be treated with aqueous sodium hyposulphite to effect tanning. Leather produced according to the invention may be conventionally matured, neutralized, dyed and nourished.

Journal ArticleDOI
TL;DR: In this article, a washing method using potassium dichromate as oxidizing reagent was applied to remove fission products and their complexing agents from kerosene degraded with nitric acid.
Abstract: A washing method using potassium dichromate as oxidizing reagent was applied to remove fission products and their complexing agents from kerosene degraded with nitric acid. The fission products and their complexing agents were both effectively removed from the degraded kerosene, their removal percentage increasing with rising concentration of sulfuric acid and potassium dichromate. The removal percentage of fission products also increased slightly with shaking time of the mixture of degraded kerosene and acidic potassium dichromate solution. Change in volume ratio (O/A) however hardly affected the removal percentage. Lowering of the absorption bands due to carboxylic acids, nitrate esters and nitro compounds were observed in the infrared spectra of the degraded kerosene treated with acidic solution of potassium dichromate. Infrared analysis of TBP/kerosene treated with acidic potassium dichromate solution showed that no chemical degradation of the solvent had occurred to any extent.