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.

Morphological features of the organs of the immune system in conditions of exposure to chromium and benzene

Abstract: Morphological features of the thymus, spleen and lymph nodes on the 45th--and 90th day of oral exposure to benzene, potassium dichromate and their mixtures were studied in 40 Wistar rats. A strong trend to a decrease in the activity of T lymphocytes has been established. Apoptotic thymocytes and lymphocytes in the T-dependent areas of spleen and lymph nodes have been revealed.

Method for detecting organic matters in soil through potassium dichromate oxidation process

Abstract: The invention relates to a method for detecting organic matters in soil through a potassium dichromate oxidation process, which comprises the steps of weighing a test sample, adding 5mL of 0.9 to 1.1mol/L of potassium dichromate standard solution and 5mL of concentrated sulfuric acid, and heating the test sample in a boiling water bath for 35 to 40 min; completely absorbing the cooled mixture into a conical flask with 250mL, adding a phenanthroline hydrate indicator, and using a ferrous sulfate solution to titrate to an end point. The method for detecting the organic matters in the soil through the potassium dichromate oxidation process optimizes the concentration of the potassium dichromate standard solution and the influence of the heating temperature and time on a detection result. The method provided by the invention is adopted to detect the content of the organic matters in the soil accurately and reliably, and the relative mean variation is less than 10%. Thus, according to the method provided by the invention for detecting the contents of the organic maters in the soil, a method which is reliable and convenient to realize is provided to meet the requirements in research and production.

Detailed Studies on the High Temperature Corrosion Reactions between Potassium Chloride and Metallic Chromium

Abstract: Recovery of energy from biomass and various waste–derived fuels by combustion has become important due to reduction of detrimental CO2 emissions. Biomass does, however, release significant amounts of chlorine and alkali metals, as e.g. HCl(g), KCl(g), KOH(g) and NaCl(g), into the gas phase during combustion. The alkali chlorides may cause deposits on superheater tubes, which interfere with operation and can lead to corrosion and/or blockage of the gas path. To prevent and diminish the problems mentioned above, better and more detailed knowledge of the reactions between potassium chloride and the tube materials during combustion is needed. These materials commonly contain, among other metals, chromium, which is thought to protect the rest of the material since it forms a very dense but thin oxide layer on the surface of the tube material. It has been suggested that the reaction between solid or partly molten KCl and chromium oxide is the one responsible for starting the complex series of corrosion reactions. In this work, the overall reaction between potassium chloride and chromium was studied through partial reactions with compounds known to participate to the overall reaction or to be formed during it. The reactions were studied in synthetic air by heating sample mixtures in a DTA/TGA (Differential Thermal Analysis/ Thermogravimetric Analysis) apparatus. Selected samples were also studied and analyzed with a scanning electron microscope equipped with an energy dispersive x-ray analyzer (SEM/EDXA). Under the used conditions both potassium chloride and potassium chromate reacted with pure chromium and chromium oxide. In the case of chromium, chromium oxide was formed via the formation of potassium chromate. In reactions including chromium oxide as reactant also potassium dichromate was detected.

Comparison of the Davies and Gray titrimetric method with potassium dichromate and ceric titrants

Abstract: The modified New Brunswick Laboratory (NBL) Davies and Gray titrimetry method uses potassium dichromate standard 136-f from the National Institute of Standards and Technology for calibration. However, the presence of chromium in the resulting waste stream makes the disposal of waste from this procedure costly. The Actinide Analytical Chemistry (C-AAC) group at Los Alamos National Laboratory investigated and transitioned to a cerium based titrant as an alternative. We present the first long-term analytical study using this ceric-based titration method and compare it with NBL results based on the more-widely used dichromate titrimetric method.