Ma W T, Fu K K, Cai Zongwei, Jiang G B
Department of Chemistry, Hong Kong Baptist University, 224 Waterloo Road, Kowloon, Hong Kong SAR, China.
Chemosphere. 2003 Sep;52(9):1627-32. doi: 10.1016/S0045-6535(03)00502-2.
The excess use of triazine herbicides in agriculture causes severe contamination to the environment especially for ground water. Gas chromatography coupled with mass spectrometry (GC/MS) was used to analyze simazine, atrazine (ATR), cyanazine, as well as the degradation products of ATR such as deethylatrazine and deisopropylatrazine in environmental water samples. These compounds were baseline separated by the established GC method. The water samples were pre-concentrated by solid-phase-extraction (SPE) and analyzed by ion trap MS at sub- to low-ppt levels. Recovery of ATR by the SPE pre-concentration using a C18 cartridge was determined as 90.5 +/- 3.5%. Detection limit of the method using selected ion monitoring technique for ATR was 1.7 ppt when one liter water was analyzed. The relative analytical error for ATR fortified water samples at 200 ppt was -12.5% (n=12) with triple analysis and the relative standard deviation was 3.2%. Trace levels of ATR at 3.9 and 9.7 ppt were determined in water samples collected from a reservoir and a river in Hong Kong.
农业中过量使用三嗪类除草剂会对环境造成严重污染，尤其是对地下水。采用气相色谱-质谱联用（GC/MS）技术分析环境水样中的西玛津、莠去津（ATR）、氰草津以及ATR的降解产物，如去乙基莠去津和去异丙基莠去津。通过已建立的GC方法对这些化合物进行基线分离。水样通过固相萃取（SPE）进行预浓缩，并采用离子阱质谱在亚ppt至低ppt水平进行分析。使用C18柱通过SPE预浓缩法测定ATR的回收率为90.5±3.5%。当分析1升水时，采用选择离子监测技术测定该方法对ATR的检测限为1.7 ppt。对加标浓度为200 ppt的水样进行三次分析，ATR的相对分析误差为-12.5%（n = 12），相对标准偏差为3.2%。在香港采集的一个水库和一条河流的水样中检测到痕量水平的ATR，浓度分别为3.9和9.7 ppt。
