QuEChERS-气相色谱法检测大米中28种农药残留量

QuEChERS-gas chromatography method for detection of 28 kinds of pesticide residues in rice

中文关键词:  大米  QuEChERS法  气相色谱法

英文关键词:rice  QuEChERS method  gas chromatography

中文摘要:

      目的 采用QuEChERS法净化-气相色谱法检测大米中28 种菊酯及有机氯类农药残留量。方法 补水还原的方法加入去离子水将样品的含水率模拟至大致75%(5 g样品+12 mL水), 选取无水硫酸镁、PSA、C18作为吸附剂, 根据秤样量确定3 种吸附剂的量为 150 mg: 25 mg: 25 mg。提取净化后的大米用气相色谱-ECD检测。结果 待测物质在0.01~2.00 μg/mL范围内呈良好的线性关系(r为0.9735~0.9991), 28种农药加标回收率为71.1%~116.8%, 精密度为4.1%~15.2%。该方法的检测低限可达0.01~0.10 mg/kg。结论 此法完全可满足日常进出口大米农残检验工作, 同其他方法相比具有节能环保、操作简单、节约成本、省时高效的特点。

英文摘要:

      Objective To detect 28 kinds of pesticide residues in rice by QuEChERS-gas chromatography method. Methods The percentage of moisture of samples were analog to about 75% (5 g sample +12 mL water), by adding deionized water based on the method of replenishment reduction. The anhydrous magnesium sulfate, PSA, and C18 were selected as adsorbent, and the amount of the three adsorbent was determined as 150 mg:25 mg:25 mg. Extraction of rice after purification were detected by gas chromatography with ECD detection. Results It showed a good linear relationship of material in 0.01~2.00 μg/mL (r=0.9735~0.9991). The recoveries of 28 kinds of pesticide were 71.1%~116.8%, with the precision of 4.1%~15.2%. The limit of detection could reach 0.01~0.10 mg/kg. Conclusion This method could meet the daily inspection work of import and export of rice residue. Compared to other methods, it had the characteristics of energy saving and environmental protection, simple operation and cost saving, time saving, and high efficiency.