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 article, the authors used wet-combustion with sulphuric acid in the presence of potassium dichromate and silver sulphate to determine chlorine in coals.
2 citations
TL;DR: Zinc potassium chromate (4Zn·O4CrO3·K2O·3H2O) was prepared using zinc salt solution, sodium hydroxide and potassium dichromate solutions.
Abstract: Zinc potassium chromate (4Zn·O4CrO3·K2O·3H2O) was prepared using zinc salt solution, sodium hydroxide and potassium dichromate solutions. The pigment synthesised was investigated by various methods. Upon heating, this pigment underwent decomposition to form ZnCr2O4, K2CrO4 and ZnO. The pigment obtained was successfully used in the preparation of glaze and then on a tile. The L*, a* and b* values of the fired glaze were 71.607, 2.695 and 67.327, respectively.
2 citations
Journal Article•
TL;DR: A new catalytic method for determining trace iron was described in this paper, where Fe(Ⅲ) could catalyze the discolouring oxidizing reaction of toluidine blue by hydrogen peroxide and potassium dichromate in sulfuric acid medium.
Abstract: A new catalytic method for determining trace iron was described.Fe(Ⅲ) could catalyze the discolouring oxidizing reaction of toluidine blue by hydrogen peroxide and potassium dichromate in sulfuric acid medium.The detection limit is 9.66×10 -9 g·mL -1 .The linear range of determination is 0～0.6μg/25mL Fe(Ⅲ).Satisfactory results were obtained for the determination of trace Fe(Ⅲ) in mineral water,radish seed,chrysanthemum ,rice and peanuts.
2 citations
Patent•
19 Jul 2006
TL;DR: In this article, a full glass vacuum solar heat collecting pipe, a butted pipe, closed space and a heat-transfer working medium is characterized, and the volume of the heat transfer working medium takes over 003% and below 1% in the closed space.
Abstract: The utility model relates to a vacuum solar heat collecting pipe of the full glass heat-pipe type, which belongs to the technical field of solar heat utilization The utility model comprises a full glass vacuum solar heat collecting pipe, a butted pipe, a closed space and a heat-transfer working medium, and is characterized in that the volume of the heat-transfer working medium takes over 003% and below 01% in the volume of the closed space The heat-transfer working medium is a propylene glycol aqueous solution of 0-30% or a mineral acid or brine solution of 0-20%; the mineral acid or brine solution is the aqueous solution of potassium dichromate, potassium sulfate, sulphuric acid and phosphoric acid, or the aqueous solution of potassium dichromate, potassium sulfate, ammonium sulfate and ammonium phosphate, or the aqueous solution of potassium dichromate, potassium sulfate, sulphuric acid, phosphoric acid, ammonium sulfate and ammonium phosphate The outer wall of the inner glass pipe of the full glass vacuum solar heat collecting pipe is provided with one or more metal support rings along the axial direction The utility model has the characteristics of safety and little damage in the process of installation and transport
2 citations
Patent•
30 Apr 1979
TL;DR: In this paper, a bead-like structure and a Vickers hardness of from 1050 to 1500 was achieved in order to achieve a chromium layer having a beadlike structure, and an aqueous bath was employed which contained from 200 to 550 g/l of chromium trioxide, in addition to strontium sulphate, in the form of the malonate if required.
Abstract: In order to achieve a chromium layer having a bead-like structure and a Vickers hardness of from 1050 to 1500, an aqueous bath is employed which, in addition to from 200 to 550 g/l of chromium trioxide from 1 to 18 g/l of strontium sulphate from 2 to 30 g/l of potassium silicofluoride from 2 to 8 g/l of potassium dichromate, as the synergetic active compound contains from 4 to 50 g/l of 2,2-dichloromalonic acid, in the form of the malonate if required.
2 citations