【摘要】 建立了一种测定水中土臭素、2-甲基异莰醇、吲哚和3-甲基吲哚的方法——顶空固相萃取(HS-SPME)和气相色谱/质谱(GC/MS)法,该方法可以检测到ng/L级的致嗅物质。详细研究了萃取纤维头的选择、萃取时间和温度、样品含盐量对HS-SPME的影响。在优化条件下,本法测定2-甲基异莰醇和土臭素的线性范围为5~200 ng/L,相关系数分别为0.999 7、0.999 8;测定吲哚和3-甲基吲哚的线性范围为200~5 000 ng/L,相关系数>0.995;方法检出限分别为2.34、2.04、98.1、93.1 ng/L;低浓度下RSD<20%,高浓度下RSD<10%;水样加标回收率为89.7%~109.5%。以IBMP为内标物,将本法成功应用于饮用水源、饮用水、河涌水中土臭素、2-甲基异莰醇、吲哚和3-甲基吲哚的测定,结果令人满意。更多还原

【Abstract】 A method to determine geosmin,2-methylisoborneol( 2-MIB),indole and skatole in water was built,namely headspace solid-phase microextraction( HS-SPME) coupled with gas chromatography/mass spectrometry( GC/MS). The method could detect odorous compounds of the order of ng/L.The influence of fiber head,extraction time and temperature,salt content of sample on HS-SPME was investigated. Under the optimized conditions,the linear ranges of the method for 2-MIB and geosmin were5 to 200 ng/L,and the correlation coefficients were 0. 999 7 and 0. 999 8,respectively. The linear ranges of the method for indole and skatole were 200 to 5 000 ng/L,and the correlation coefficients were both greater than 0. 995. The limits of detection( LOD) were 2. 34 ng/L,2. 04 ng/L,98. 1 ng/L and93. 1 ng/L respectively. The relative standard deviation at low level was less than 20%,and that at high level was less than 10%. The recovery rates of water samples were between 89. 7% and 109. 5%. Using IBMP as internal standard,the method was successfully applied to the determination of geosmin,2-MIB,indole and skatole in source water,drinking water and watercourse water,with satisfactory results.更多还原