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对有机氯农药六六六4个组份、滴滴涕4个组份,在淡水养殖用水和底泥中的残留进行了试验分析;对有机氯农药多残留分析方法进行了优化和评估。按欧盟法规2002/657/EC要求,对方法的回收率与日内、日间精密度等进行了单实验室验证。对两种不同定义的“方法的检出限”进行了详细的估算和结果比较。结果表明: 本试验方法在加标水平养殖用水2.0×10-5、2.5×10-5mg·L-1和底泥为1.0×10-3、5.0×10-3mg·kg-1时,平均回收率养殖用水在65%-119%之间,变异系数在9%以内;底泥在77%-116%,变异系数在11%以内。本试验中有机氯农药六六六、滴滴涕在二倍信噪比法的检出限养殖用水为1.8×10-6-3.8×10-6 mg·L-1,底泥4.7×10-5-8.8×10-5 mg·kg-1;USEPA定义的检出限养殖用水3.1×10-6-4.7×10-6mg·L-1,底泥1.0×10-4-2.0×10-4mg·kg-1。结果符合欧盟制定的规定和要求。
Experiments were carried out on four components of organochlorine pesticides (BHC), four components of DDT, residues in freshwater aquaculture water and sediment, and multi-residue analysis methods for organochlorine pesticides were optimized and evaluated. According to the requirements of EU regulation 2002/657 / EC, a single laboratory verification was conducted on the recovery rate of the method, the precision of days and days, and the like. A detailed estimation and comparison of the results of two different definitions of “method detection limits” were carried out. The results showed that the average recovery of this test method was 2.0 × 10-5, 2.5 × 10-5 mg · L-1 and 1.0 × 10-3, 5.0 × 10-3 mg · kg-1 for horizontal culture water Rate of aquaculture water between 65% -119%, coefficient of variation of less than 9%; sediment at 77% -116%, coefficient of variation of less than 11%. In this experiment, the detection limits of organochlorine pesticides BHC and DDT in the double-signal-to-noise ratio method were 1.8 × 10-6-3.8 × 10-6 mg · L-1 and 4.7 × 10-5- 8.8 × 10-5 mg · kg-1; the limit of detection limit defined by USEPA was 3.1 × 10-6-4.7 × 10-6mg · L-1, and the sediment was 1.0 × 10-4-2.0 × 10-4mg · kg -1. The results meet the EU regulations and requirements.