阿维菌素•虫螨腈在青菜上的残留特性及其膳食摄入风险评估

Residue behavior and dietary intake risk assessment of abamectin and chlorfenapyr in pakchoi (Brassica chinensis L.)

中文关键词:  青菜  阿维菌素  虫螨腈  残留  大棚  露地  风险评估

英文关键词:pakchoi  abamectin  chlorfenapyr  residue  greenhouse  open field  risk assessment

中文摘要:

      目的 研究阿维菌素?虫螨腈复配剂在青菜上的残留特性, 评估其膳食摄入风险。方法 对上海市松江区冬季与夏季不同生长季节及露地与大棚不同种植环境下青菜上进行阿维菌素?虫螨腈残留试验, 通过串联质谱法检测有效成分在青菜上阿维菌素?虫螨腈的残留量, 并对其膳食摄入风险进行评估。结果 阿维菌素及虫螨腈在青菜上的降解趋势符合一级动力学方程, 原始沉积量平均值分别为0.315～0.418 mg/kg、1.422～3.446 mg/kg, 消解半衰期分别为0.88～2.30 d、4.36～5.02 d。最后一次施药3 d后阿维菌素及虫螨腈最终残留量均低于相应最大残留限量值。各类人群通过青菜摄入阿维菌素及虫螨腈的风险商最大值均远低于1, 风险概率均低于100%。结论 消解时间、环境因素及施药浓度均对虫螨腈的残留有显著影响(P<0.05), 而影响阿维菌素消解残留的主要因素为消解时间。在推荐使用浓度下(45~60 g a.i/hm2), 20%阿维菌素?虫螨腈在青菜上的安全间隔期为5 d。

英文摘要:

      Objective To study the residual characteristics of avermectin and chlorfenapyr on pakchoi, and evaluate their dietary intake risk assessment. Methods Abamectin and chlorfenapyr residue tests were carried out on pakchoi in Songjiang district of Shanghai under different growing seasons in winter and summer and under different planting conditions in open field and greenhouses. The residual amount of abamectin and chlorfenapyr in pakchoi was detected by tandem mass spectrometry and the dietary intake risk was evaluated. Results Field experiments showed that the dissipation dynamics of abamectin and chlorfenapyr in pakchoi exhibited a first- order kinetic decline, and their initial residues were 0.315–0.418 mg/kg and 1.422–3.446 mg/kg, while half~lives were 0.88–2.30 d and 4.36–6.60 d, respectively. The final residues of abamectin and chlorfenapyr after the last application for 3 d were lower than the corresponding maximum residue limits. The risk assessment showed that maximal hazard quotient (HQ) of abamectin and chlorfenapyr for different groups consuming pakchoi was far below 1, and highest risk probability (RP) was below 100%. Conclusion Digestion time, environmental factors and application concentration all have significant effects on chlorfenapyr residue (P<0.05), while the main factor affecting abamectin digestion residue is digestion time. At the recommended concentration (45-60 g a.i/hm2), the safe interval of 20% abamectin and chlorfenapyr on green vegetables is 5 days.