Table 2.
Precision studies for breast milk.
| RSD (%)a |
||||||
|---|---|---|---|---|---|---|
| Study | No. | ∑PBDEs (ng/g lw) | ∑PCBs (ng/g lw) | BDE-47 | BDE-153 | PCB-153 |
| Concurrent QCPs | 8 | 28–31 | 34–48 | 3.5 | 1.3 | 3.9 |
| Duplicatesa | 21, 16 | 18–1,100 | 73–311 | 5.3 | 4.7 | 3.9 |
| HE/P pairs | 16 | 14–821 | 79–231 | 3.4 | 3.8 | 9.3 |
lw, lipid weight.
a
Duplicate measurements were made in 21 samples for PBDEs, and in 16 samples for PCBs. RSDs for duplicates are means of the RSDs calculated for each of the 21 or 16 pairs of duplicate measurements; RSDs for HE/P pairs are means of the RSDs calculated for each of the 16 HE/P pairs of samples.