Study on the residues amount of hexachloro-cyclohex ane and dichlorodiphenyl trichloroethane in rice and its rhizosphere soil

The residue status of hexachloro-cyclohexane （BHC） and dic hlorodiphenyl trichloroethand（DDT） in rice and its rhizosphere soil in Sichuan Province was studied.The results show that BHC or DDT still exists in soil,however,they are not detected in rice samples.BHC and DDT residue levels accord with the National Health Food Standard.Although DDT is detected in most of rhizosphere soil,BHC is also found in soil from Xiaoquan Town in Deyang County,the status of these two organochlorine pesticides residues in soil don't exceed the standard content according to the GB15618-95.So,all the investigated soils accord with the standard of natural background value. In addition,BHC and DDT are advised to be forbidden from using continuously,whilst the code must be established as soon as possible so as to forbid the use of dicofol in the edible vegetable production.