固相微萃取-气相色谱法测定水中痕量甲萘威

建立了固相微萃取-气相色谱法测定水中痕量甲萘威的方法,并对固相微萃取条件进行了优化。结果显示,固相萃取的最佳条件为:水样pH值≤3,不添加无机盐,聚二甲基硅氧烷(PDMS,100μm)作为萃取纤维,萃取温度为80℃,萃取时间为30 min,解吸时间为90 s。优化后的方法,在甲萘威质量浓度0.01~1.0 mg/L范围内线性良好,相关系数为0.999 5,方法的精密度为1.9%,检出限为0.3μg/L,加标回收率为85.6%~92.4%,可满足地表水中甲萘威的测定要求。

Determination of Trace Carbaryl in Water by Gas Chromatography with Solid Phase Micro extraction

A new method was developed for the detection of carbaryl in water by gas chromatography (GC) with solid phase micro-extraction (SPME).The operating conditions of SPME were optimized at first.Phosphoric acid was added to the water sample to adjust the pH value less than or equal to 3.No need to add inorganic salts to the water sample.The best response of carbaryl was obtained using 100 μm PDMS.10.0 mL water sample was extracted at 80 ℃ for 30 min, and the desorption time was 90 s.Under the optimized conditions, the linear coefficient of carbaryl was 0.999 5 in the range of 0.01~1.0 mg/L.The precision of this method was 1.9%, and the detection limit was 0.3 μg/L.The recovery rate was 85.6%~92.4%.This method can fully meet the requirements of determination of carbaryl in surface water.