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目的建立气相色谱法(GC)测定水样中扑草净残留量的方法。方法采用顶空-固相微萃取(HS-SPME)分离、净化和富集水样中的分析物,并对实验参数如萃取时间、萃取温度、离子强度和pH范围进行了优化。结果 GC结合HS-SPME检测扑草净的线性范围为0.5~10μg/L,相关系数r2=0.999 9,方法的检出限为0.05μg/L。水样的加标回收率为101.5%~103.0%,相对标准偏差为1.01%。结论该方法适于测定水样中扑草净残留量。
Objective To establish a method for the determination of prometryn in water samples by gas chromatography (GC). Methods Headspace-solid phase microextraction (HS-SPME) was used to purify and enrich the analytes in aqueous samples. The experimental parameters such as extraction time, extraction temperature, ionic strength and pH range were optimized. Results The linear range was 0.5-10 μg / L for GC combined with HS-SPME. The correlation coefficient r2 was 0.999 9. The detection limit was 0.05 μg / L. The spiked recoveries of water samples ranged from 101.5% to 103.0% with relative standard deviations of 1.01%. Conclusion The method is suitable for the determination of prometryn in water samples.