地下水中有机氯农药测量方法准确度的平衡均匀水平试验

采用5个浓度水平样品通过7家实验室进行协同评定试验,验证了地下水中六氯苯、α-HCH、β-HCH、γ-HCH、δ-HCH、p,p’-DDE、p,p’-DDD、o,p’-DDT、p,p’-DDT有机氯农药分析方法的稳定性与准确性。测量结果经一致性和离群值检验表明,地下水中9种有机氯农药组分在3.00～56.5 ng/L浓度水平范围内,重复性标准差为0.50～0.77 ng/L,再现性标准差为1.92～3.03 ng/L,单个样品中的2,4,5,6-四氯间二甲苯和二丁基氯菌酸酯替代物质量监控指标回收率分别为58.8%～99.5%和79.2%～117%。检测方法准确、可靠。

A Balanced Uniform-Level Experiment for the Accuracy of Organochlorine Pesticides Measurement Method in Groundwater

The stability and accuracy of the measurement method for hexachlorobenzene,α-HCH,β-HCH,γ-HCH,δ-HCH,p,p′-DDE,p,p′-DDD,o,p′-DDT and p,p′-DDT in groundwater has been determined by a balanced uniform-level experiment for 5 different content level samples from 7 laboratories.After being verified for consistency and outliers,the statistical results of 9 organochlorine pesticides in groundwater indicated that the repeatability standard deviation was 0.50-0.77 ng/L and the reproducibility standard deviation was 1.92-3.03 ng/L within a level range of 3.00-56.5 ng/L.The recovery rates of surrogates for 2,4,5,6-tetrachloro-m-xylene and dibutyl chlorendate were 58.8%-99.5% and 79.2%-117%,respectively.The detection method was accurate and reliable.