• 关键词：有机氯农药  蔬菜  残留量  生物富集  人类健康

• 基金项目：国家杰出青年科学基金(40325001);国家重点基础研究发展规划项目(2002CB410805);中国科学院知识创新工程领域前沿项目(ISSASIP0202)

• 郜红建
• 中国科学院南京土壤研究所, 南京 210008

• 蒋新
• 中国科学院南京土壤研究所, 南京 210008

• 摘要：用气相色谱电子捕获检测器(GC-ECD)测定南京市郊蔬菜中的有机氯农药残留.结果表明,12种有机氯农药在所有的供试蔬菜中均有检出,DDT和HCH在各蔬菜中的含量较高,分别占有机氯农药总残留量的49.5%~75.0%和13.9%~28.2%.W_α-HCH/W_γ-HCH和W_DDEW_DDT的比值在各蔬菜体内均小于或等于1,说明这些蔬菜生长的环境中可能有新的有机氯污染物的输入.各种蔬菜对有机氯农药总量的富集因子为0.41~0.78,富集能力最大的为胡萝卜,蒜苗和菠菜.HCH类农药在各种蔬菜体内的生物富集因子(0.7~0.10)要高于DDT类(0.28~0.80).胡萝卜对HCH和DDT等有机氯农药的富集能力较强,而莴苣、蒜苗和菠菜对六氯苯、狄氏剂,异狄氏剂和硫丹有较高的生物富集能力.虽然各种蔬菜体内有机氯农药的残留量低于国家最大残留限量,但其检出率仍为100%,仍然对农产品质量安全和人类健康造成潜在的威胁.

• Abstract：Accumulation of representative POPs in vegetables was determined in raw vegetables from vegetable base of Nanjin, China. Organochlorine pesticide residues were extracted from chopped samples by using a mixture of hexane and acetone (4:1, V/V), cleaned up with SPEcolumn and subsequent eluted with dichloromethane and petroleum ether (1:9, V/V), then analyzed by gas chromatography equipped with a ⁶³Ni electron-capture detector (ECD) system. Twelve organochlorine pesticides which were : p,p'-DDT, p,p'-DDE, p,p'-DDD, o,p'-DDT, o,p'-DDE,α-HCH,β-HCH,γ-HCH,δ-HCH, dieldrin and endrin were 100% detected in all ten vegetables. The residue levels in carrot, spinach and garlic leaf were higher than that in other vegetables. In each vegetable, the concentration order of OCPs was ∑DDT>∑HCH>dieldrin, endrin and HCB. DDTand HCHwere the main OCPs residues in vegetables, accounting for 49.5% to 75.0% and 13.9% to 28.2% of all OCPs residues detected, respectively. The ratio of W_α-HCH/W_γ-HCH and W_DDE /W_DDT were below or equal to 1.0, which indicated that Lindane and DDTmight be input into environment recently. The bioconcentration factors of OCPs in different vegetables were between 0.41 and 0.78, and bioconcentrating ability of carrot, garlic leaves and spinach were higher than others. The BCFs of HCHs(0.70 to 1.10) in all vegetables were higher than DDTs'(0.28 to 0.80). In all vegetables investegated, carrot could bioconcentrate more HCHs and DDTthan other vegetables, whose BCF were 1.10 and 0.80 respectively. Meanwhile, lettuce, garlic leaves and spinach could absorb more HCB, Dieldrin and Endrin from environment. Though the average levels were generally low and none of then was above MRLof national standard, it still was dangerous to food quality and human health.

• Key words：organochlorine pesticide residues  vegetables  residue levels  bioconcentration  human health

• 
  摘要点击次数： 2563 全文下载次数： 3439