The stability and accuracy of the measurement method for hexachlorobenzene, a-HCH, /3-HCH, y-HCH, 5-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.%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.
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