Department of Chemistry, College of Science, Agricultural University of Hebei, Baoding, China.
J Sep Sci. 2013 Oct;36(19):3242-8. doi: 10.1002/jssc.201300656. Epub 2013 Aug 28.
Graphene-grafted ferroferric oxide microspheres were used as the adsorbent to extract some pyrethroid pesticides (bifenthrin, λ-cyhalothrin, cyfluthrin, cypermethrin, fenvalerate, and deltamethrin) from orange and lettuce samples prior to their determination by GC-MS. The main variables that could affect the extraction, including the amount of the adsorbent, pH of the sample solution, extraction time, concentration of salt, and desorption conditions, were investigated and optimized. Under the optimized conditions, a linear response was obtained in the concentration range of 0.3-100.0 ng/g for the analytes with the coefficients of determination ranging from 0.9877 to 0.9925. The LODs for the pyrethroids ranged from 0.01 to 0.02 ng/g. The method provided a good repeatability with RSDs < 10.6%. The recoveries for the six pyrethroid pesticides were in the range from 90.0 to 103.7%. The method was applied to the determination of the pesticides in orange and lettuce samples with a satisfactory result.
石墨烯接枝四氧化三铁微球被用作吸附剂，从橙子和生菜样品中提取一些拟除虫菊酯类农药（如联苯菊酯、氯氟氰菊酯、氯氟氰菊酯、氯菊酯、氰戊菊酯和溴氰菊酯），然后用 GC-MS 进行测定。考察并优化了影响提取的主要变量，包括吸附剂的用量、样品溶液的 pH 值、提取时间、盐浓度和洗脱条件。在优化条件下，分析物在 0.3-100.0ng/g 浓度范围内呈线性响应，相关系数范围为 0.9877 至 0.9925。拟除虫菊酯的检出限为 0.01-0.02ng/g。该方法具有良好的重现性，相对标准偏差（RSD）<10.6%。六种拟除虫菊酯农药的回收率在 90.0%至 103.7%之间。该方法应用于橙子和生菜样品中农药的测定，结果令人满意。
