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, simple, cost effective and reproducible spectrophotometric methods are proposed for the determination of enalapril maleate, lisinopril dihydrate, moexipril hydrochloride and ramipril chloride in pure and tablet doage forms.
Abstract: Simple, cost effective and reproducible spectrophotometric methods are proposed for the determination of enalapril maleate, lisinopril dihydrate, moexipril hydrochloride and ramipril hydrochloride in pure and tablet doage forms. The methods are based on oxidation of these drugs by either potassium dichromate or potassium permanganate in sulphuric acid medium then measuring of the developed colored reaction products or the decrease in the intensity of color at λmax 610, 520 nm for the potassium dichromate (method A) and potassium permanganate (method B) respectively. Different variables affecting the reaction conditions were carefully studied and optimized. Under optimal experimental conditions the linear range is 20-900 μg.ml-1 (method A) and 2-500 μg.ml-1 (method B). The proposed methods were successfully applied to the analysis of the investigated drugs in pure and tablet dosage form. Results were comparable with those obtained by reported spectrophotometric methods.
4 citations
TL;DR: Injection of potassium cyanide, hydroxylamine, or thiosemicarbazide to newly emerged mealworm beetles inhibits regional sclerotization of the cuticle, whereas juvenile hormone mimics do not interfere with this process.
4 citations
01 Jan 1990-International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry
TL;DR: The response of aqueous dichromate dosimeters can be enhanced by adding small controlled amounts of organic reducing agents, however, such additives cause instabilities before and after irradiation.
4 citations
TL;DR: In this article, a radiometric method based on the redox substoichiometry has been developed for the determination of tellurium, and the chemical yield of the chemical content of 50 to 160 μg could be determined with an accuracy of ± 1.3% by means of the comparison method.
Abstract: A radiometric method based on the redox substoichiometry has been developed for the determination of tellurium. The oxidation of tellurium(IV) to tellurium(VI) with potassium dichromate was employed as the substoichiometric reaction, followed by TBP (tributyl phosphate) extraction of the unreacted tellurium(IV) as the substoichiometric isolation. The oxidation of tellurium(IV) with dichromate under the substoichiometric conditions was incomplete. The chemical yield of tellurium(VI) produced by the oxidation of tellurium(IV) with dichromate was 83%. It was found that a tellurium content of 50 to 160 μg could be determined with an accuracy of ±1.3% by means of the comparison method.
4 citations
TL;DR: The stoicheiometry of the reaction of iron(II) with chromium(VI) and the suitability of potassium dichromate as a primary standard have been examined in this article.
Abstract: The stoicheiometry of the reaction of iron(II) with chromium(VI) and the suitability of potassium dichromate as a primary standard have been examined. To differentiate the effects of possible non-stoicheiometry and impurities in the samples, several different sources of chromium(VI) and three different standardisation schemes, based on the use of arsenic trioxide, sodium oxalate and potassium iodate, have been used. It is shown that the stoicheiometry of the reactions is satisfactory and that suitable grades of potassium dichromate are excellent primary standards.
4 citations