Identification of Fenton's reagent-generated atrazine degradation products by high-performance liquid chromatography and megaflow electrospray ionization tandem mass spectrometry
作者:Scott M. Arnold、Rasmy E. Talaat、William J. Hickey、Robin F. Harris
DOI:10.1002/jms.1190300309
日期:1995.3
High-performance liquid chromatography megaflow electrospray tandem mass spectrometry (HPLC/ES-MS/MS) with an on-line radioisotope detector was used to identify [2,4,6-14C] atrazine degradation products generated by treatment with Fenton's reagent (Fe2+ and H2O2). Fenton's reagent produced dealkylated and/or partially oxidized [2,4,6-14C] atrazine products in preference to dechlorinated products. Seven major products were identified by collision-induced dissociation spectra: 4-acetamido-2-chloro-6-(isopropylamino)-s-triazine, 4-amino-2-chloro-6-(isopropylamino)-s-triazine, 4-acetamido-2-chloro-6-(ethylamino)-s-triazine, 6-amino-2-chloro-4-(ethylamino)-s-triazine, 4-acetamido-6-amino-2-chloro-s-triazine, 2-chloro-4,6-diamino-s-triazine and the first report of 4-acetamido-2-hydroxy-6-(isopropylamino)-s-triazine. HPLC/ES-MS/MS provided a rapid method for identifying a wide range of atrazine transformation products in aqueous samples and obviated the need for fraction collection, extraction, and chemical derivatization of the more polar atrazine products. Furthermore, because analyte retention times in HPLC/UV and HPLC/ES-MS/MS were similar, compound identities determined using the latter could be directly assigned to peaks in UV chromatograms.
采用高效液相色谱法(HPLC)和串联质谱法(MS/MS),并在线使用放射性同位素检测器,对用Fenton试剂(Fe2+和H2O2)处理后产生的[2,4,6-14C]莠去津降解产物进行了鉴定。Fenton试剂产生的脱烷基和/或部分氧化的[2,4,6-14C]莠去津产物优先于脱氯产物。通过碰撞诱导解离光谱法鉴定出了7种主要产物:4-乙酰氨基-2-氯-6-(异丙基氨基)-s-三嗪、4-氨基-2-氯-6-(异丙基氨基)-s-三嗪、4-乙酰氨基-2-氯-6-(乙基氨基)-s-三嗪、6-氨基-2-氯-4-(乙基氨基)-s-三嗪、4-乙酰氨基-6-氨基-2-氯-s-三嗪、2-氯-4,6-二氨基-s-三嗪,以及首次报告的4-乙酰氨基-2-羟基-6-(异丙基氨基)-s-三嗪。HPLC/ES-MS/MS为鉴定水样中多种莠去津转化产物