联苯菊酯、氯氟氰菊酯、氰戊菊酯、溴氰菊酯在马铃薯中的稳定性研究

Study on the stability of bifenthrin, cypermethrin, fenvalerate and deltamethrin in potato matrix

中文关键词:  联苯菊酯  氯氟氰菊酯  氰戊菊酯  溴氰菊酯  稳定性

英文关键词:bifenthrin  cypermethrin  fenvalerate  deltamethrin  stability

中文摘要:

      目的 对4种拟除虫菊酯类农药联苯菊酯, 氯氟氰菊酯, 氰戊菊酯, 溴氰菊酯在马铃薯中的稳定性进行评估。方法 通过在马铃薯基质中加入梯度为0.02、0.05、0.08 μg/g的4种农药标准溶液, 放置于常温(20 ℃)、4 ℃和18 ℃环境中, 间隔一段时间对其农药残留进行检测。结果 联苯菊酯在马铃薯基质中的稳定性好, 放置50 d残留量仍可保持在90%~110%之间, 其余3种拟除虫菊酯类农药稳定性较差, 在不同环境中储藏2个月后残留量降低至10%~80%之间。结论 本研究提示氯氟氰菊酯、氰戊菊酯、溴氰菊酯稳定性低, 在农产品储藏过程中会降解, 可作为低毒农药使用。同时在各级实验室间比对和考核过程中, 应对上述参考物质的稳定性进行严格考察。

英文摘要:

      Objective To evaluate the stability of four major pyrethroid pesticides bifenthrin, cyhalothrin, fenvalerate, decamethrin using potato as matrix. Methods The mixed standard solution of four major pyrethroid pesticides was spiked into potato matrix at 0.02, 0.05 and 0.08 μg/g as low, medium and high level. The residue of pesticides was analyzed at intervals after storage at room temperature (20 ℃), 4 ℃and 18℃. Results Bifenthrin has high stability in potato matrix because its residue could be remained at 90%-110% after 50 days storage. Other three kinds of pyrethroid pesticides have low stability. Their residue sunk to 10%-80% after two months storge in different environments. Conclution The present study indicates that the cyhalothrin, fenvalerate and decamethrin can be used as low-toxic pesticides because of its instability. It also suggestes that the stability of reference material should be strictly controlled during the inter-laboratory validation.