Topic
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.
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TL;DR: In this paper, an exercise for training students in chemical kinetics that involves the oxidation of polyols with potassium dichromate is presented, where the reactivities of the different polyols are compared and differences are interpreted in terms of stereoelectronic factors.
Abstract: An exercise for training students in chemical kinetics that involves the oxidation of polyols with potassium dichromate. The reactivities of the different polyols are compared and differences are interpreted in terms of stereoelectronic factors. In each case, the relative value of the experimental rate constant is used to infer the role of the substituents in the reaction pathway.
11 citations
Patent•
01 Aug 2012
TL;DR: In this article, the utility model relates to a high-efficiency iron rust conversion agent, and belongs to the field of antirust paint, where the conversion agent comprises the following raw materials by weight: 1-10% of zinc oxide, 20-40% of phosphoric acid, 5-15% of dichromate, 0.5% of metal oxides, 5% of phosphate, 1% of corrosion inhibitor and 50-70% of solvent.
Abstract: The utility model relates to a high-efficiency iron rust conversion agent, and belongs to the field of an antirust paint The iron rust conversion agent comprises the following raw materials by weight: 01-10% of zinc oxide, 20-40% of phosphoric acid, 05-15% of dichromate, 05-10% of phosphate, 01-10% of corrosion inhibitor, and 50-70% of solvent, wherein the dichromate is potassium dichromate or sodium dichromate; the phosphate is sodium phosphate or potassium phosphate; the corrosion inhibitor is urotropine or urea; and the solvent is water or ethanol The preparation method comprises the steps as follows: sequentially adding the solvent, the phosphoric acid, the dichromate, the phosphate, the corrosion inhibitor and the zinc oxide to a glass cup under persistently stirring according to the mass ratio, and dissolving for 10-20 min The production method bases on the dissolving of the solid reactants in the phosphoric acid solution The phosphorized film formed by iron rust conversion has the effects of preventing rust and fixing remnant rust, and the formed phosphorized layer protective film is long-acting, and stable in atmospheric environment, lubricating oil and organic solvent, has high adhesion, can be used as a primer, has dielectric properties, and can prevent electro-chemical corrosion on the metal surface
11 citations
TL;DR: When used in specific doses, boron compounds are a promising means of preventing and correcting chromium-induced effects in chromium production facility workers and people who live in ecologically adverse regions.
Abstract: The purpose of this research is to study the process of mutagenesis and the reproductive function in male rats under separate and combined exposure to chromium and boron compounds. The experiment was conducted on two groups of animals. The first group was used to assess the ability of potassium dichromate and boric acid to induce mutation in germ and somatic cells under isolated and combined administration with the use of the dominant lethal mutations test and the micronuclei test in the polychromatophilic erythrocytes of the bone marrow. The second group was used to test the combined and separate effect of the compounds under consideration on the reproductive function of male rats during the spermatogenesis cycle. When used in specific doses, boron compounds are a promising means of preventing and correcting chromium-induced effects in chromium production facility workers and people who live in ecologically adverse regions.
11 citations
TL;DR: The application of the differential method of working to coulometric analysis is discussed in this paper, where experiments are described on the differential constant-current coulometric titration of potassium dichromate with ironII ion to establish the validity and precision of the technique.
11 citations
TL;DR: In this paper, it was found that impregnated blocks contained mercurous chromate, Hg2CrO4, after mercurous nitrate treatment, and mercuric oxide chromate (Hg3O2crO4), Hg3CrO 4, after MR treatment.
Abstract: Golgi impregnation of nerve tissue can be obtained by soaking the tissue in a solution of potassium dichromate followed by a solution of mercurous or mercuric nitrate. The precipitate formed in each of these two methods has been identified. Samples of impregnated tissues were ground and examined with X-ray powder diffraction and the patterns of spacings compared both with the values of international tables (the ASTM index) and with the results of X-ray studies of substances prepared by ourselves and subjected to quantitative chemical analysis. It was found that impregnated blocks contained mercurous chromate, Hg2CrO4, after mercurous nitrate treatment, and mercuric oxide chromate, Hg3O2CrO4, after mercuric nitrate treatment. Selected area electron diffraction of ultrathin sections through impregnated nervous structures (embedded in epoxy resin) showed these to contain the substances demonstrated by X-ray analysis of whole tissue.
11 citations