Search results
Results From The WOW.Com Content Network
Per- and polyfluoroalkyl substances are a group of synthetic organofluorine chemical compounds that have multiple fluorine atoms attached to an alkyl chain. Different organizations use different definitions for PFAS, leading to estimates of between 8,000 and 7 million chemicals within the group.
Examples include PFOA and PFOS, frequently present in water-resistant textiles and sprays conferring water-resistant properties to textiles and fire-fighting foam. [3] Data from animal studies of PFOA indicate that it can cause several types of tumors and neonatal death and may have toxic effects on the immune, liver, and endocrine systems.
2017 PFAS are on the Government of Canada's 2019 chart of substances prohibited by the Canadian Environmental Protection Act, 1999 (CEPA) and by the Prohibition of Certain Toxic Substances Regulations, 2012. These substances are under these regulations because they are "among the most harmful" and "have been declared toxic to the environment ...
The FDA has issued a request for information seeking scientific data on concentrations of per- and polyfluoroalkyl substances (PFAS) in seafood, the surrounding environment and processing water.
Chemicals found in sewage sludge that some farmers use to fertilize fields and pastures can pose a threat to human and animal health, the US Environmental Protection Agency said Tuesday.
For example, Minnesota recommends a guidance value of 0.027 μg/L for PFHxS, [23] and Michigan has a screening level of 0.084 μg/L for PFHxS. [4] In 2020, Michigan adopted drinking water standards for 5 previously unregulated PFASs including PFHxS, which has a maximum contaminant level (MCL) of 51 parts per trillion (ppt) or 0.051 μg/L. [24] [25]
The chemicals detected were perfluoroalkyl and polyfluoroalkyl substances, or PFAS — a group of manufactured chemicals that break down at an extremely slow rate, meaning they can accumulate over ...
Perfluorononanoic acid, an example of a perfluoroalkyl carboxylic acid (PFCA) Perfluoroalkyl carboxylic acids (PFCAs), or perfluorocarboxylic acids are compounds of the formula C n F (2n+1) CO 2 H that belong to the class of per- and polyfluoroalkyl substances. The simplest example is trifluoroacetic acid.