Potassium dichromate

About: Potassium dichromate is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 18967 citations. The topic is also known as: Potassium dichromate(VI) & Chromium potassium oxide.

Sensitivity to dichromate in a milk analysis laboratory.

Abstract: Polyethyleneglycols of varying molecular weights are extensively used as vehicles in topical medicaments and are not listed as sensitizers in standard reference books. We recently performed a human Draize test to screen an experimental bar soap for allergic contact sensitization. The experimental details are published (Marzulli & Maibach 1974). The soap was tested at 3 % in water with the challenge concentration reduced to 1%. One subject (out of 200) had a strong spreading reaction at the final elicitation. This was repeated three times at biweekly intervals with similar results. Breakdown testing of the soap components revealed a strong reaction only to 3 % polyethyleneglycol 300 in petrolatum. This was repeated with a similar result. Additional challenges with 3 % polyethyleneglycol 600, 1,000, 4,000 and 6,000 were all positive. He also reacted to these at 1 % in petrolatum. The subject next received liberal use type applications twice a day for 7 days of 3 % polyethyleneglycol in petrolatum to his cheek and forearm. No dermatitis developed. In summary, polyethyleneglycol produced contact sensitization in one subject out of 200 undergoing a Draize test with a bar soap. Sensitivity spread to include molecular weights of 600, 1,000, 4,000, and 6,000. He was not sensitive enough to develop dermatitis in an open use test with 3 % polyethyleneglycol 300. Braun (1969) documented polyethyleneglycol sensitivity in a group of patients using an antibiotic dressing. We wonder how often such sensitization occurs and if it is frequent enough to include in vehicle battery trays.

Textile fiber drafting element and method of making same

Abstract: A textile fibre drafting element, e.g. a drafting apron, spinning roll or roll cover, has a surface of a rubber-like conjugated diene polymer or copolymer which has been modified by reaction with an aqueous solution of sulphuric acid containing dichromate ions, the concentration of the sulphuric acid being at least 1 per cent. but not sufficient to effect substantial deterioration of the rubber-like material, and its dichromate ion concentration being at least 0.01 mol. per litre. The treatment may be carried out before or, preferably, after vulcanization. Specified rubber-like materials, are polychloroprene, polyisoprene, polybutadiene, and copolymers of butadiene with styrene, acrylonitrile or acrylic esters. Specified dichromate ion substances are potassium dichromate, ammonium dichromate and sodium dichromate. It is preferred that the aqueous solution contains 1 to 25 per cent. sulphuric acid and from 0.01 to 0.5 mols. per litre of dichromate ion. Specification 643,666 is referred to.

The flavonoid quercetin protects and prevents against potassium dichromate–induced systemic peroxidation of lipids and diminution in renal clearance of para-aminohippuric acid and inulin in the rat

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.

Method of converting hydroxysteroids to ketosteroids

Abstract: Our invention relates to a method for oxidizing hydroxysteroids to convert them to ketosteroids. Numerous chemical procedures for carrying on this oxidation have been described heretofore, including oxidation by chromic acid, potassium permanganate, potassium dichromate, hydrogen peroxide,...