What is a PCB congener?
A PCB congener is any single, unique well-defined chemical compound in the PCB category. The name of a congener specifies the total number of chlorine substituents , and the position of each chlorine.
What is PCB in toxicology?
Polychlorinated biphenyls (PCBs) are a group of manmade chemicals. They are oily liquids or solids, clear to yellow in color, with no smell or taste. PCBs are very stable mixtures that are resistant to extreme temperature and pressure. PCBs were used widely in electrical equipment like capacitors and transformers.
What is a safe level of PCB?
The National Institute for Occupational Safety and Health (NIOSH) recommends that exposure to PCB’s in the workplace be limited at or below the minimum reliable detectable concentration of 1 µg/m3 (using the recommended sampling and analytical methods) determined as a TWA for up to a 10-hour workday, 40-hour workweek.
What is PCB chemical formula?
The chemical formula of PCBs is C12H10-nCln, where n ranges from 1 to 10. Theoretically, 209 different congeners are possible, but only about 130 of these have been identified in commercial products.
What is aroclor1260?
Aroclor 1260 is a commercial mixture of PCBs with an average chlorine content of 60%. It is composed of mainly pentachlorobiphenyls (43.35%) and hexachlorobuphenyls (38.54%) and also includes mono-, bi-, tri, tetra-, hexa-, octa- and nonachlorinated homologs.
What are PCB electronics?
Printed circuit boards (PCBs) are the foundational building block of most modern electronic devices. Semiconductors, connectors, resistors, diodes, capacitors and radio devices are mounted to, and “talk” to one another through the PCB.
What is PCB transformer?
What is a PCB transformer? A “PCB transformer” is a transformer that is known, or assumed under TSCA, to contain PCBs at concentrations greater than 500 parts per million (ppm). “PCB-Contaminated Transformers” known, or assumed under TSCA, to contain between 50 and 499 ppm PCBs are also subject to EPA regulations.
What is PCB testing?
PCB testing, or printed circuit board testing, begins with understanding that the PCB is the foundation for any printed circuit assembly (PCA). The circuit board is a top quality product that should not cause your end product to cost you money due to failures and recalls.
What is degree of chlorination?
The chlorination degree of CPs can vary between 30 and 70 wt%. CPs are subdivided according to their carbon chain length into short-chain CPs (SCCPs, C10–13), medium-chain CPs (MCCPs, C14–17) and long-chain CPs (LCCPs, C>17).
Do capacitors contain PCBs?
PCBs are found extensively in transformers and capacitors used in the electrical industry and in a wide range of other products. Smaller PCB filled capacitors are fitted to electric motors, welders and fluorescent lights.