What To Know About Chromates

2022-12-03

chromate refers to salts containing Chromate CrO42−. Generally yellow, silver dichromate is dark red. Chromates of alkali metals and magnesium, such as sodium chromate, potassium chromate, magnesium chromate, etc., are soluble in water, while chromates of other alkaline earth metals and heavy metals are insoluble in water. Has a strong oxidizing effect. When acidified in solution, it is converted into dichromate, and its color changes from yellow to orange-red. Barium Chromate and Lead Chromate are used as yellow pigments. Soluble chromates are commonly used as oxidizing agents and as tanning agents. Can be prepared from chromite ore.

Chromate minerals are salts formed by the combination of metal element cations and chromate radicals. Chromium is a variable-valence element that occurs in nature in different valence states and forms different minerals. Because in nature, most of the chromium participates in the composition of oxides and chromium-containing silicates, while the number and types of chromate minerals are very small. There are no more than ten types of data. Chromate minerals are most notably characterized by their distinctive colour. Usually yellow, orange or maroon, green when containing copper. The hardness is generally not high, between 2-3. The specific gravity is generally between 2-3. Chromate minerals are often the product of weathering conditions and are found in the oxidation zones of ore deposits.

Effects of occupational exposure to chromate on blood routine indexes.

Chromium and its compounds are widely used in chemical industries such as electroplating, welding, alloy manufacturing, pigments, and tanning. Occupational exposure is mainly through respiratory inhalation. Inhalation of dust and smoke containing hexavalent chromium can cause upper respiratory tract irritation symptoms, and even nasal mucosal ulcers. Chronic effects can cause kidney damage and lung cancer. The International Institute of Cancer Research classified hexavalent chromium as a class I human carcinogen in 1990. Animal experiments have found that long-term exposure to hexavalent chromium can also have adverse effects on the blood system, such as changes in the proportion of blood cells.

GBZ188-2007 Occupational Health Surveillance Technical Specification stipulates that workers exposed to chromium and its inorganic compounds must check items including blood routine and other 6 items. No reports of blood routines being effective in the health monitoring of chromate-exposed workers have been found. Based on workshop environmental monitoring and individual chromate-exposed biological exposure evaluations, changes in blood routines in the exposure group and control group were compared, and blood routines were compared with those in the control group. The relationship between air chromium and erythrocyte chromium aims to evaluate the necessity and effectiveness of blood routine as a health monitoring indicator for workers exposed to chromate, and provide a basis for the improvement of chromate health monitoring guidelines.

Barium Chromate

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