不同采收期及贮藏条件下冬枣中54种农药的筛查、残留消解动态与膳食风险评估

利用气相色谱-串联质谱法及液相色谱-串联质谱法,研究了不同贮藏时间、贮藏温度及采收期对冬枣在不同流通环节中农药残留的影响,并对冬枣中检出的12种农药的安全使用风险进行了评估.结果表明,对供试冬枣样品筛查了54种待测农药,共检出12种,检出率为22.6％,均未检出禁用和高毒农药.在室温条件下,多菌灵在冬枣中的半衰期为4....

Screening,residue dissipation and risk assessment of 54 pesticides in winter jujube under different harvesting and storage conditions

The effects of different storage time, storage temperature and harvesting period on pesticide residues in different circulation stages of winter jujube were studied by using GC-MS-MS and LC-MS-MS. And the risk assessment for the safe application of 12 kinds of pesticides in winter jujube was conducted. The results showed that, among the 54 pesticides tested, 12 of them were detected in the winter jujube samples, and the overall detection rate was 22.6%. No banned or highly toxic pesticides were detected. At room temperature, the half-life of carbendazim was 4.8-6.0 days, the half-life of pentazolidol was 4.9-11.2 days, and the half-life of phenyleocycloazole, imidacloprid, and pyrizoyl ester were 10.0 days, 2.8 days, and 6.9 days, respectively. Under the condition of 0 ℃, the half-life of carbendazim was 5.5-9.4 days, the half-life of pentazolidol was 14.1-57.8 days, and the half-life of phenyleocycloazole and imidacloprid were 8.6 days and 10.5 days, respectively. The dissipation of 9 pesticides in winter jujube at different harvesting stages was obvious. The dissipation of fresh jujube at commercial harvesting stage was higher than 50%. Studies on the risk assessment of chronic and acute dietary exposure to pesticide residues in winter jujube after different harvest and market procurements showed that the risk of dietary intake was low and acceptable, except for carbendazem. The chronic ingestion risks of carbendazim in winter jujube in different circulation periods (market procurement) were unacceptable.