Emission inventory for PFOS in China: review of past methodologies and suggestions.

ScientificWorldJournal · 2011 · PMC3217613 · PMID 22125449

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a decreasing trendno p-value reported

Increasing production and use of perfluorinated compounds in China have resulted in higher PFOS and PFOA concentrations in human serum, while serum concentrations in the United States have shown a decreasing trend [ 10 ].

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