2 results about "Potassium chromate" patented technology

The invention belongs to the technical field of nano materials, and particularly relates to a preparation and transfer method of an inclined chromic oxide single-crystal nanosheet. The preparation method specifically comprises the following steps: uniformly mixing potassium chromate and chromic chloride to obtain precursor powder; transferring the precursor powder into a porcelain boat, and covering the surface of the precursor powder with a molecular sieve; enabling the oxide layer of the SiO2 / Si substrate to face downwards and obliquely cover the molecular sieve; and then transferring into a vacuum tube furnace, heating and reacting, and cooling to obtain the inclined chromic oxide single crystal nanosheet on the surface of the SiO2 / Si substrate. The inclined chromium oxide single crystal nanosheet is placed on other clean substrates, and the chromium oxide single crystal nanosheet is transferred to other clean substrates through mechanical pressing. The method provided by the invention has the advantages of good controllability, good repeatability, high yield, low cost, no pollution in transfer and the like.

This application relates to the field of environmental monitoring and water quality analysis technology, and in particular to a mixed reagent, test reagent tube, and digestion method for COD detection of petrochemical wastewater. The components, by mass percentage, are: sulfuric acid 75.0–90.0%, potassium dichromate 0.5–1.0%, silver sulfate 1.0–2.7%, scandium sulfate 0.01–0.07‰, potassium hydrogen phthalate 0.1–0.25‰, glucose 0.1–0.25‰, with the remainder being pure water; the mixed reagent does not contain mercuric sulfate. This application enables mercury-free and highly efficient digestion of high-salt, high-organic-content petrochemical wastewater, improves the oxidation efficiency of benzene compounds and polycyclic aromatic hydrocarbons, reduces the detection limit to below 5 mg / L, and the wastewater is easy to treat, combining high accuracy with environmental friendliness.