Hickes H, Watrous M
Montana Department of Agriculture, Montana State University, Bozeman 59717, USA.
J AOAC Int. 1999 Nov-Dec;82(6):1523-33.
A liquid chromatographic method with comfirmation by capillary electrophoresis was used to determine 12 sulfonylurea herbicides in agricultural water. Analysis of 3 different water matrixes fortified at 2 levels gave good recoveries with adequate sensitivity at the 0.1 ppb level. A portion of the water was acidified with acetic acid and loaded onto an RP-102 solid-phase extraction (SPE) cartridge, and the extract was cleaned up on an alumina SPE cartridge. Extracts were desalted with an RP-102 SPE cartridge before instrumentation. Samples needing chemical filtration, such as pond water, required additional cleanup with a SAX SPE cartridge before the alumina cleanup step. Data were compiled for both determinative techniques and evaluated.
采用液相色谱法并结合毛细管电泳进行确证，以测定农业用水中的12种磺酰脲类除草剂。对3种不同水基质在2个加标水平下进行分析，在0.1 ppb水平下回收率良好且灵敏度足够。取一部分水样用乙酸酸化后加载到RP - 102固相萃取（SPE）柱上，提取物再在氧化铝SPE柱上进行净化。在进样分析前，提取物先用RP - 102 SPE柱进行脱盐处理。对于需要化学过滤的水样，如池塘水，在氧化铝净化步骤之前，还需要用SAX SPE柱进行额外净化。对两种测定技术的数据进行了汇总和评估。
