大气压固体分析探头离子化技术在饮用水中乐果测定的应用研究

目的 建立生活饮用水中乐果的大气压固体分析探头离子源-串联质谱测定方法。 方法 水样用微量移液器直接上样,通过大气压固体分析探头离子源离子化,在大气压化学电离正离子模式下以多反应监测方式检测。 结果 乐果线性范围为1.5~100.0 μg/L,相关系数为0.999 7,检出限为0.5 μg/L,加标回收率为73.4%~85.7% ,相对标准偏差为9.4%~15.3%。 结论 大气压固体分析探头离子化技术与串联质谱联用,无需样品前处理和色谱分离即可对样品进行测定,分析速度快、灵敏度高、准确性好,适用于生活饮用水中乐果的测定。

Application of atmospheric-pressure solids analysis probe-triple quadrupole mass spectrometry technique to determination of dimethoate in drinking water

Objective To establish a method for the determination of dimethoate in drinking water by atmospheric pressure solids analysis probe-triple quadrupole mass spectrometry (ASAP-MS/MS). Methods Water samples were added to the probe by pipette, detected by mass spectrometer in positive mode using multiple reaction monitoring. Results The linear range of dimethoate was 1.5-100.0 μg/L, the correlation coefficient was 0.9997, and the limit of detection was 0.5 μg/L. The average recovery of standard addition was 73.4%-85.7%, and the relative standard deviation was 9.4%-15.3%. Conclusions The proposed ASAP-MS/MS technique can be a powerful tool for sample detectionwithout any sample pretreatment and chromatographic separation. This technique has the advantages of rapidity, high sensitivity and accuracy, and it is suitable for the determination of dimethoate in drinking water.