Lead chromate

Lead chromate is a chemical compound with the formula PbCrO4. It is an inorganic compound that is insoluble in water and is used as a pigment due to its bright yellow color.

Chemical Properties

Lead chromate is a yellow, crystalline, inorganic compound that combines lead, chromium, and oxygen. It is insoluble in water and is resistant to acids. The compound is formed when solutions of lead(II) salts are treated with a solution of a chromate or dichromate, such as potassium chromate or potassium dichromate.

Uses

The primary use of lead chromate is as a pigment in paints, inks, and ceramics due to its bright yellow color. It is also used in the manufacture of safety matches, pyrotechnics, and explosives. In the past, it was used in yellow road markings and signages, but due to its toxicity, it has been largely replaced by safer alternatives.

Health Effects

Exposure to lead chromate can have serious health effects. It is classified as a carcinogen by the International Agency for Research on Cancer (IARC) and can cause lung cancer when inhaled. It can also cause damage to the kidneys and the reproductive system.

Regulation

Due to its toxicity, the use of lead chromate is heavily regulated. In the European Union, it is banned from use in cosmetics and in materials that come into contact with food. In the United States, the Occupational Safety and Health Administration (OSHA) has set strict exposure limits for workers handling lead chromate.

See Also

• Lead(II) chromate
• Lead poisoning
• Chromium toxicity