松叶中有机氯农药HCH、DDT的研究

 利用气相色谱-电子捕获检测(GC-ECD)方法对我国华北、华东、华南和西南地区松叶中六六六(HCH)和滴滴涕(DDT)的残留量进行了测定,结果表明,松叶中HCH 4种异构体(a,b,g,d)的含量以b-HCH为最高,占HCH总量的38%～46%.HCH、DDT和滴滴伊(DDE)的含量范围分别为24.7～35.5ng/g干重,2.4～7.0ng/g干重,2.4～2.8ng/g干重.DDE的含量趋势为华北>华东>华南>西南.总HCH为华东>华北>华南>西南.华北和华东地区DDE/DDT>1,华南和西南地区DDE/DDT<1,这表明在华南和西南地区大气中新近有DDT的输入.

Studies on the organic chlorine pesticide HCH and DDT in pine needles

The residual amount of HCH and DDT in pine needles of north, east, south and southwestern areas in China were determined with gas chromatography-electron capture detector (GC-ECD). The results indicated that b-HCH content was the highest among four HCH isomers (a, b, g, d) amounting 38%~46% of the total amount. The content ranges of HCH, DDT and DDE were 24.7~35.5ng/g, 2.4~7.0ng/g and 2.4~2.8ng/g respectively. The contents of DDE and total HCH tended to be north China>east China>south China>southwestern China, and east China>north China>south China> southwestern China, respectively. The ratio of DDE and DDT in north and east China was greater than 1; and the ratio was less than 1 in south and southwestern China, which showed that in these two regions there was recent input of DDT.