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Abstract
N-Nitrosodimethylamine (NDMA) in human urine was determined by chemical ionization-mass fragmentography (CI-MF), and the results were compared with those of thermal energy analyzer (TEA). Urine samples were extracted with dichloromethane and the concentrate was cleaned up on a silica gel column. CI-MF was very sensitive (detection limit was 1.2 pg at S/N=2) and the selectivity was comparable with that of TEA. NDMA levels in urine were ND-0.14 ppb. The values determined by CI-MF were similar to those by TEA, and this method was applicable to trace analysis of urinary NDMA with high sensitivity (above 0.002ppb).
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