Question: EPA established legally enforceable levels, called Maximum Contaminant Levels ( MCLs ) , for six PFAS in drinking water. The MCL for PFOA is 4

EPA established legally enforceable levels, called Maximum Contaminant Levels (MCLs), for six PFAS in
drinking water. The MCL for PFOA is 4 ppt. Assuming the density of drinking water is equal to the density of
water, 1,000kgm3. Express the MCL concentration in (a)ngL; (b)gL(Answer: 0,000000004gL)
EPA established legally enforceable levels,

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