论文部分内容阅读
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。
A method for the determination of geosmin, 2-methylisoxalane, indole and 3-methylindole in water was developed by headspace solid phase extraction (HS-SPME) and gas chromatography / mass spectrometry (GC / MS) Method, this method can detect ng / L-class olfactory substances. The effects of fiber head selection, extraction time and temperature, and sample salinity on HS-SPME were investigated in detail. Under the optimized conditions, the linear range of 2-methylisorbitol and geosmin was 5 ~ 200 ng / L, the correlation coefficients were 0.999 7 and 0.999 8, respectively. The linearity of indole and 3-methylindole The detection limits were 2.34, 2.04, 98.1 and 93.1 ng / L, respectively. RSD <20% at low concentration and RSD <10% at high concentration were observed in the range of 200-5 000 ng / L with the correlation coefficient> 0.995. Spike recovery was 89.7% ~ 109.5%. Using IBMP as internal standard, this method was successfully applied to the determination of geosmin, 2-methylisoxalol, indole and 3-methylindole in drinking water sources, drinking water, creek water, and the results were satisfactory .