NIST issues human milk and blood serum SRMs for contaminant measurements
To prepare these SRMs, scientists collected 200 liters of blood serum and 100 liters of milk from banks across the United States and divided the sample pools in half. Researchers packaged half of each material as received, containing the natural (unfortified) level of contaminants, and treated (fortified) the other halves with a solution containing 172 selected contaminants. The fortified samples contain a concentration of those contaminants at levels five to 10 times higher than the median concentrations found in the U.S. population.
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