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Questions and Answers
Which organization expanded the definition of PFASs in 2021?
Which organization expanded the definition of PFASs in 2021?
- The Organisation for Economic Co-operation and Development (OECD) (correct)
- The International Union for Conservation of Nature (IUCN)
- The World Health Organization (WHO)
- The United States Environmental Protection Agency (EPA)
How many distinct PFASs that contain at least three perfluorinated carbon atoms are known according to the OECD?
How many distinct PFASs that contain at least three perfluorinated carbon atoms are known according to the OECD?
- 1,000
- 14,735
- 4,730 (correct)
- 100,000
What is the early definition of PFASs from 2011 based on?
What is the early definition of PFASs from 2011 based on?
- The presence of at least one fully fluorinated methyl or methylene carbon atom
- The absence of any H/Cl/Br/I atom attached to a fluorinated substance
- The presence of at least one perfluoroalkyl moiety (correct)
- The presence of at least three perfluorinated carbon atoms
How many unique PFAS chemical compounds are listed in the United States Environmental Protection Agency's (EPA) toxicity database, DSSTox?
How many unique PFAS chemical compounds are listed in the United States Environmental Protection Agency's (EPA) toxicity database, DSSTox?
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What is the common feature of PFASs?
What is the common feature of PFASs?
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Study Notes
PFAS Definitions and Organizations
- The Organization for Economic Co-operation and Development (OECD) expanded the definition of PFASs in 2021.
Distinct PFAS Compounds
- The OECD recognizes over 4,700 distinct PFASs containing at least three perfluorinated carbon atoms.
Early Definition of PFASs
- The early 2011 definition of PFASs was based on the presence of the perfluoroalkyl functional group, highlighting their unique chemical structure.
PFAS in EPA Toxicity Database
- The United States Environmental Protection Agency's (EPA) toxicity database, DSSTox, lists approximately 2,500 unique PFAS chemical compounds.
Common Features of PFASs
- A common characteristic of PFASs is their resistance to both water and oil, contributing to their persistence in the environment.
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