Table 1. Method Performance and Concentrations of N-Nitrosamines in U.S. Biosolids.
| recovery (%)b |
biosolids
concentration (ng/g) avg. (min, max)c |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| compound | CAS# | molecular weight (g/mol) | absolute | relative | method detection limit (ng/g dw) | wet weight | dry weight | RPDd (%) | detection frequency (%) |
| NDMA | 62-75-9 | 74 | 32 ± 12 | 110 ± 11 | 5.7 | 150 (54, 248) | 504 (87, 920) | 34 | 3 |
| NMEAa | 10595-95-6 | 88 | 32 ± 7 | 1.1 | 11.4 (5.5, 14) | 121 (20, 393) | 12 | 5 | |
| NDPA | 621-64-7 | 130 | 41 ± 12 | 100 ± 5 | 0.6 | 44 (2.4, 314) | 134 (7, 505) | 46 ± 20 | 21 |
| NDBAa | 924-16-3 | 158 | 38 ± 14 | 0.1 | 0.7 (0.2, 1.9) | 1.8 (0.2, 3.3) | 21 ± 23 | 9 | |
| NPYRa | 930-55-2 | 100 | 51 ± 8 | 2.3 | 3.8 | 7.6 | 15 | 1 | |
| NPIP | 100-75-4 | 114 | 52 ± 7 | 100 ± 4 | 1.1 | 78 (12, 224) | 332 (51, 1185) | 15 | 11 |
| NDPhA | 86-30-6 | 198 | 68 ± 18 | 90 ± 10 | 0.06 | 4.5 (0.1, 91) | 10 (0.7, 147) | 23 ± 29 | 79 |
a
Concentrations of analytes lacking stable-isotope labeled analogues are not recovery corrected.
b
Relative recoveries were determined using area ratios of analyte to (stable-isotope labeled) surrogate standard. Absolute recoveries were obtained using absolute areas instead of area ratios. Absolute recoveries were determined from matrix spike studies.
c
Dry weight concentrations were calculated from wet weight concentrations using the solids content of the biosolids samples.
d
RPD: relative percentage difference.