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: The chemical mechanism of cytological fixation by anionic chromium reagents remains to be elucidated, and ionic interactions and complex formations, often with associated precipitation, involving various tissue constituents and the several chromium ions are probably more important.
Abstract: 0.07 M (1 per cent.), 0.17 M (2.5 per cent.), and 0.34 M (5 per cent.) solutions of analytical-grade potassium dichromate have pH values of 4.10, 4.05, and 3.85 respectively. The values for corresponding solutions of chromic acid are 1.20, 0.85, and 0.70. The oxidation potential for potassium dichromate is 0.76 V, and for chromic acid, 1.10 V. During fixation for 18-20 hours at room temperature, with either reagent, there is a small decrease in hydrogen-ion concentration but no appreciable change in oxidation potential. During postchroming for 48 hours at 37° C, there is a further decrease in hydrogen-ion concentration, but only in the case of chromic acid is there a decrease in oxidation potential. The morphological features of the fixed cells are determined almost entirely by the fixing reagent. Postchroming can influence staining properties. There are two characteristic fixation ‘pictures’ depending upon the pH of the reagent: (1) with chromic acid and the more acidic dichromates (barium, calcium, mercuric, or silver) there is destruction of the mitochondria and disorganization of the cytoplasm and nuclear contents, resisted only by the nucleolus, and (2) with potassium dichromate and the other less acidic dichromates (ammonium, lithium, or sodium), the mitochondria, cytoplasm, and nucleus are well fixed. With various tissues from mice, the transition between the two types occurs around pH 3.4-3.8. The chemical mechanism of cytological fixation by anionic chromium reagents remains to be elucidated. Oxidative reactions do occur. Probably more important are ionic interactions and complex formations, often with associated precipitation, involving various tissue constituents and the several chromium ions.
5 citations
5 citations
TL;DR: The oxidative stress responses of Clarias gariepinus exposed to potassium dichromate at sublethal concentrations for 28 days were studied in 2017 and there were alterations in values of glutathione peroxidase, superoxide dismutase, and catalase during exposure and recovery periods.
Abstract: The oxidative stress responses of Clarias gariepinus exposed to potassium dichromate at sublethal concentrations for 28 days were studied in 2017. Fish were exposed to 0.165, 0.0825 and 0.033 mg l−...
5 citations
Patent•
29 Apr 2015
TL;DR: In this paper, a corrosion resistant and resistance-reduction conductive concrete for acid soil areas is proposed. But the concrete is not suitable for the transmission line grounding grid, as it can not be used for not only reducing the grounding resistance but also improving the corrosion resistance of a grounding electrode.
Abstract: The invention relates to the field of conductive concrete and particularly relates to corrosion-resistant and resistance-reduction conductive concrete for acid soil areas The corrosion-resistant and resistance-reduction conductive concrete is prepared from the following raw materials: cement, polyaniline and a filler, wherein the polyaniline is composed of the following components in parts by weight: 20-40 parts of aniline, 5-15 parts of acidic catalyst, 30-40 parts of oxidant and 3-20 parts of solvent; the filler is one or more of sand, stone, fly ash and grey stone; the acidic catalyst is one or more of hydrochloric acid, phosphoric acid, picric acid, dodecylbenzene sulfonic acid, dinonylnaphthalenesulfonic acid sol and succinic acid dioctyl phthalate sulfonic acid; the oxidant is one or more of persulfate ammonium, potassium dichromate, hydrogen peroxide, potassium iodate and potassium permanganate; the solvent is one or more of water, ethanol and ethyl acetate; when applied to a transmission line grounding grid, the conductive concrete provided by the invention can be used for not only reducing the grounding resistance, but also improving the corrosion resistance of a grounding electrode, especially in an acidic corrosive soil environment
5 citations
Patent•
10 Sep 2014
TL;DR: In this article, a method for detecting potassium dichromate by utilizing a graphene quantum dot probe is described, which is characterized by comprising the following steps: (1) establishing a linear relationship: preparing a standard solution of GQD and PDE solution, and obtaining the linear relation between the fluorescent intensity of the graphene quantum dots and the concentration of the PDE through the fluorescent spectra; (2) detecting: detecting the fluorescent intensities of the to-be-detected PDE, and determining the content of PDE in the detected PDE according to the
Abstract: The invention discloses a method for detecting potassium dichromate by utilizing a graphene quantum dot probe. The method is characterized by comprising the following steps: (1) establishing a linear relationship: preparing a standard solution of graphene quantum dot and potassium dichromate solution, and obtaining the linear relation between the fluorescent intensity of the graphene quantum dot and the concentration of the potassium dichromate through the fluorescent spectra; (2) detecting: detecting the fluorescent intensity of the to-be-detected potassium dichromate solution, and determining the content of the potassium dichromate in the to-be-detected potassium dichromate solution according to the linear relation. The method is easy to operate, rapid in detection, high in sensitivity and good in selectivity, has the characteristics of high sensitivity and high selectivity when potassium dichromate in a mixed sample is detected and is promising in application prospect.
5 citations