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目的了解通州区部分茶叶中六六六、滴滴涕有机氯农药残留和重金属铅的化学污染状况。方法采用气相色谱法测定茶叶中六六六和滴滴涕农药残留,用原子吸收分光光度法测定重金属铅的含量。结果茶叶中六六六检出率为92.1%(35/38),合格率97.1%(34/35),超标率为2.9%(1/35),测定值范围在<0.4～385.0μg/kg之间。滴滴涕检出率为89.4%(34/38),合格率100%,测定值范围为1.4～189.0μg/kg,以p,p′-DDT的检出最多。重金属化学污染物铅检出率97.6%(37/38),各类茶叶中铅测定结果均低于标准限值。结论有机氯农药虽然禁用多年,但茶叶中六六六仍有较高残留,提示通州区茶叶中六六六和滴滴涕的农药残留状况不容乐观;重金属铅的检出率较高,食品卫生监督机构应加强监测,保证食品的安全和消费者的健康。
Objective To understand the chemical contamination of some BHC, DDT organochlorine pesticide residues and heavy metal lead in some tea leaves in Tongzhou District. Methods The residues of BHC and DDT in tea were determined by gas chromatography, and the content of heavy metal lead was determined by atomic absorption spectrophotometry. Results The detection rate of BHC in tea was 92.1% (35/38) with the pass rate of 97.1% (34/35) and the exceeding standard rate of 2.9% (1/35). The measured value ranged from <0.4 to 385.0μg / kg between. The detection rate of DDT was 89.4% (34/38) with a pass rate of 100%. The determination range was 1.4-189.0 μg / kg, and the detection of p, p’-DDT was the most. The detection rate of lead in heavy metal chemical pollutants was 97.6% (37/38). The results of lead determination in various types of tea were lower than the standard limits. Conclusions Although organochlorine pesticides are banned for many years, the residues of BHC in tea still have higher residues, which indicates that the pesticide residues in BHC and DDT in Tongzhou District are not optimistic. The detection rate of heavy metal lead is higher. Food hygiene supervision agencies Monitoring should be strengthened to ensure food safety and consumer health.