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62 and 1.02 ng g-1 and median concentrations of 0.13 and 0.53 ng g-1, respectively. Median concentrations of the other PFAS ranged from detected values to 0.08 ng g-1. This analytical procedure yields useful data on fetal exposure to PFAS.There is a lack of certified reference materials with an organic matrix for which metal isotope ratios have been certified. Here, we have determined the iron, copper and zinc stable isotopic compositions for six reference materials of biological origin with diverse matrices, i.e. BCR-380R (whole milk),
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