搅拌棒萃取-热脱附／气质联用法测定水中2-MIB和土臭素

摘要

A method using stir bar sorptive extraction ( SBSE)-thermal desorption ( TD)/gas chromatogra-phy coupled with mass spectrometry ( GCMS) was developed to determinate ultra-trace level of 2-methylisoborneol (2-MIB) and geosmin in water .SBSE and TD parameters were optimized through blank spiked sample .The method showed good linearity ( r>0 .999 ) over concentration range from 1 ng/L to 200 ng/L and high sensitivity ( the MDL of 2-MIB and geosmin were 0 .31 ng/L and 0 .15 ng/L respectively ) .The spiked recovery of blank and real samples ranged from 82 .4%to 116%with RSD <10%.%采用搅拌棒萃取-热脱附/气质联用法测定水中2-甲基异莰醇和土臭素，优化了搅拌棒萃取和热脱附进样的条件。试验表明：两种目标化合物在1．00 ng/L～200 ng/L范围内线性良好，2-甲基异莰醇的相关系数为0．9993，土臭素的相关系数为0．9997，方法检出限分别为0．31 ng/L和0．15 ng/L；空白和实际样品的加标回收率为82．4％～116％，测定结果的RSD＜10％。