Huang L Q
Connecticut Agricultural Experiment Station, Department of Analytical Chemistry, New Haven, CT 06504.
J Assoc Off Anal Chem. 1989 Mar-Apr;72(2):349-54.
A multiresidue method was developed for the simultaneous determination of low parts per billion (ppb) concentrations of the herbicides alachlor, metolachlor, atrazine, and simazine in water and soil using isotope dilution gas chromatography/mass spectrometry (GC/MS). Known amounts of 15N,13C-alachlor and 2H5-atrazine were added to each sample as internal standards. The samples were then prepared by a solid phase extraction with no further cleanup. A high resolution GC/low resolution MS system with data acquisition in selected ion monitoring mode was used to quantitate herbicides in the extract. The limit of detection was 0.05 ppb for water and 0.5 ppb for soil. Accuracy greater than 80% and precision better than 4% was demonstrated with spiked samples.
建立了一种多残留方法，用于使用同位素稀释气相色谱/质谱法（GC/MS）同时测定水和土壤中痕量（十亿分之几，ppb）浓度的除草剂甲草胺、异丙甲草胺、阿特拉津和西玛津。向每个样品中加入已知量的15N,13C-甲草胺和2H5-阿特拉津作为内标。然后通过固相萃取制备样品，无需进一步净化。使用在选择离子监测模式下进行数据采集的高分辨率GC/低分辨率MS系统对提取物中的除草剂进行定量。水的检测限为0.05 ppb，土壤的检测限为0.5 ppb。加标样品的准确度大于80%，精密度优于4%。
