生活用水中六六六和滴滴涕的残留分析

Research on hexachlorocyclohexane and dichlorodiphenyltrichloroethane residues in domestic water

目的利用气相色谱法测定自来水、桶装水、纯水、蒸馏水中的六六六和滴滴涕含量,研究六六六和滴滴涕对不同生活用水污染情况。方法采用液液萃取方法,用石油醚提取水中六六六和滴滴涕,氮吹仪浓缩后用气相色谱仪ECD检测器检测,外标法定量。结果不同生活用水中六六六和滴滴涕均有检出,其中β-BHC、o,p′-DDT检出率为100%,α-BHC检出率为75%,纯水中和桶装水中含量较低。结论六六六、滴滴涕由于其化学性质稳定及高残留性所引起的远期危害不容忽视。

Objective To determine the content of hexachlorocyclohexane (BHC) and dichlorodiphenyltrichloroethane (DDT) by gas chromatography in the tap water, bottled water, pure water and distilled water, so as to study the pollution resulted by BHC and DDT in different kinds of domestic water. Methods By using the method of liquid-liquid extraction, the BHC and DDT were extracted with petroleum ether from water firstly. They were concentrated with pressure blowing concentration secondly. Then, the analysis was detected by gas chromatography with ECD detector, and quantified the sample by external standard. Result The BHC and DDT were detected in different life water. The detectable rates ofβ-BHC and o,p′-DDT were 100%, the detectable rate of α-BHC was 75%, and the content of BHC and DDT in the pure water and bottled water were low. Conclusion The long-term harm caused by the high chemical stability and persistent of BHC and DDT can not be ignored.