广州郊区菜地、果园、稻田有机氯农药残留特征初步研究

Characters of Organochlorine Pestcides Residues in Vegetable Field,Orchard and Paddy Soil in Guangzhou Suburban Areas

目的研究广州郊区菜地、果园、稻田土壤中有机氯农药残留特征。方法于2008年8月采集广州市白云、从化、增城、番禺、南沙5个区域的菜地、果园、稻田0～20cm表层土壤样品,对白云和番禺两个采样点增加采集20～40cm和40～60cm两个剖面的土壤样品,采用气相色谱-电子捕获检测器法(GC-ECD)检测17种有机氯农药。结果表层土壤17种有机氯农药检出率为90.59%,其残留量范围为4.19～39.89ng/g;剖面土壤17种有机氯农药检出率为76.70%,其残留量范围为2.35～91.26ng/g。有机氯农药(OCPs)主要残留物是六六六类(HCHs)和滴滴涕类(DDTs)。结论有机氯农药检出率较高,白云和番禺的菜地20～40cm剖面土壤OCPs超标,对土壤环境有一定危害。

Objective To analyze the characteristics of of organochlorine pesticides （OCPs） residues in the soil of the suburbs of Guangzhou. Methods In Baiyun, Conghua, Zengcheng, Panyu, Nansha, surface soil （0-20 cm） samples of vegetable fields,orchard and paddy soil were collected, soil profile （20-40cm ,40-60cm） of Baiyun and Panyu were also collected, in Aug, 2008. Gas chromatography-electron capture detector method （GC-ECD）was used to determine 17 kinds of organochlorine pesticides. Results The detection rate of 17 kinds of organochlorine pesticides was 90.59% in topsoil, the residue level was 4.19-39.89 ng/g, and the detection rate in profiles soil was 76.70 %, the residue level was 2.35-91.26 ng/g. OCPs residues were mainly HCHs and DDTs. Conclusion Detection rate of organochlorine pesticides is high in soil in the investigated soil and in the 20-40 cm profiles of Baiyun and Panyu, the level of OCPs exceeds the related standard limit, which may have adverse effects on soil environment.