优化气相色谱法测定生活饮用水中六六六和滴滴涕

Optimization of gas chromatography method to determine benzene hexachloride and dichlorodiphenyl trichloroethane in drinking water

中文关键词:  气相色谱法  液-液萃取  六六六  滴滴涕

英文关键词:gas chromatography  liquid-liquid extraction  benzene hexachloride  dichlorodiphenyl trichloroethane

中文摘要:

      目的 优化GB/T 5750.9-2006《生活饮用水标准检验方法 农药指标》中的气相色谱法测定生活饮用水中六六六(α-666、β-666、γ-666、δ-666)和滴滴涕(ρ,ρ'-DDE、ο,ρ'-DDT、ρ,ρ'-DDD、ρ,ρ'-DDT)含量。方法 样品经石油醚萃取浓缩后, 经由电子捕获检测器-气相色谱测定α-666、β-666、γ-666、δ-666、ρ,ρ'-DDE、ο,ρ'-DDT、ρ,ρ'-DDD、ρ,ρ'-DDT的含量。结果 8种组分在8 min内全部出峰, 各物质在5~100.0 μg/L浓度范围内线性关系良好, 相关系数均大于0.999, 检出限为0.007~0.010 μg/L, 回收率为85.10%~105.85%, 相对标准偏差为0.43%~2.68%。结论 该方法分离效果高, 灵敏度高, 重复性好, 准确度高, 可以满足实验室条件下水样中六六六和滴滴涕的测定。

英文摘要:

      Objective To optimize the gas chromatography method for the determination of benzene hexachloride (α-666, β-666, γ-666, δ-666) and DDT (ρ,ρ'-DDE, ο,ρ'-DDT, ρ,ρ'-DDD, ρ,ρ'-DDT) in drinking water in GB/T 5750.9-2006 Drinking water standard test method Pesticide index . Methods The sample was extracted and concentrated by petroleum ether, then the contents of α-666、β-666、γ-666、δ-666、ρ,ρ'-DDE、ο,ρ'-DDT、ρ,ρ'-DDD、ρ,ρ'-DDT were detected by electron capture detector- gas chromatography. Results The 8t components all peaked within 8 min, and each substance had a good linear relationship in the concentration range of 5–100.0 μg/L, and the correlation coefficients were all greater than 0.999. The limits of detection were 0.007– 0.010 μg/L. The recovery rates were 85.10%-105.85%, and the relative standard deviations were 0.43%–2.68%. Conclusion The method has high separation effect, high sensitivity, good repeatability and high accuracy, and can be used to determine benzene hexachloride and dichlorodiphenyl trichloroethane in water samples under laboratory conditions.