Analytical method for the determination of atrazine and its dealkylated chlorotriazine metabolites in urine by gas chromatography/mass selective detection
1998
Bodalbhai, L.H. | Yokley, R.A. | Cheung, M.W.
A multiresidue method is reported for the determination of atrazine and its chlo ro dealkylated metabolites in urine. Urine samples were subjected to a protein p recipitation procedure followed by further purification using strong anion excha nge and silica solid-phase extraction columns. Final analysis was accomplished u sing gas chromatography/mass selective detection in the selected ion monitoring mode. The limits of detection were 0.050 ng injected for 2,4-diamino-6-chloro-s- triazine (G-28273) and 0.025 ng injected for 2-chloro-4-(ethylamino)-6-(isopropy lamino)-s-triazine (atrazine), 2-amino-4-chloro-6-(isopropylamino)-s-triazine (G -30033), and 2-amino-4-chloro-6-(ethylamino)-s-triazine (G-28279). The limits of quantification were 1.0 ppb for atrazine and G-30033 and 2.0 ppb for G-28279 an d G-28273. The mean procedural recoveries obtained during the method validation were 115, 113, 112, and 97% and the standard deviations were 10.6, 10.2, 9.5, an d 16.1% for atrazine, G-30033, G-28279, and G-28273, respectively. Additional re covery data were obtained during a worker exposure study and during an outside r uggedness trial. All studies were conducted under U.S. EPA FIFRA Good Laboratory Practice Standards 40 CFR 160.
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