地质调查样品中有机氯农药分析的灵敏度和准确定性控制方法

有机氯农药是地质调查水和土壤样品中必测的半挥发性有机污染物。该类农药由于含量低,所以在分析检测工作中必须注重细节。文章结合大量地质调查水和土壤样品中有机氯农药分析的数据和实践经验,从石英棉的使用、进样溶剂的选择以及假阳性的判断和排除等3个方面,讨论如何提高分析的灵敏度和定性的准确性。

Improvement of Sensitivity and Accuracy in the Determination of Organochlorine Pesticides in Geological Samples

Determination of 9 organochlorine pesticides (usually in trace level) is necessary for water and soil quality evaluation in geological survey project. Based on the large amounts of the analytical data of organochlorine pesticides in groundwater and soils from geological survey project and authors' practical experiences, the measures to improve the sensitivity and accuracy for the determination of organochlorine pesticides in groundwater and soils were discussed. The response values of target compounds were improved by use of silica wool and selection of the injection solvent. And using GC-MS/SIM in judgement and elimination of false-positive results were also discussed in details.