顶空固相微萃取-气相色谱-质谱联用测定饮用水中的2-甲基异莰醇和土臭素

发布时间：2018-11-07 07:06

【摘要】：2-甲基异莰醇(2-methylisoborneol,2-MIB)和土臭素(geosmin,GSM)在水源水中大量分泌排放是造成饮用水土霉异味突发事件、引发居民用水恐慌的重用因素之一。使用顶空固相微萃取(HS-SPME)与气相色谱-质谱联用技术(GC-MS)建立了水库水、水库附近土壤、居民自来水中2-MIB和GSM的测定方法。结合正交分析优化了加盐量、萃取温度、萃取时间条件,在电子轰击(EI)-选择离子扫描(SIM)模式下进行了目标物的定性定量分析。结果表明:在5~1 000 ng/L范围内,2-MIB和GSM的色谱峰面积与其质量浓度的线性关系良好(r2≥0.998),2-MIB与GSM的检出限分别为0.72 ng/L和0.34 ng/L,定量限分别为2.40 ng/L和1.13 ng/L;目标物加标水平为10~600 ng/L时,平均回收率为93.6%~107.7%,相对标准偏差(RSD)≤6.1%(n=6)。基于上述方法,对辽宁省某地区水库水、水库附近土壤、居民自来水中的目标物进行检测,结果表明:水库水目标物质量浓度范围为3.0~3.6ng/L,水库附近土壤中提取的2-MIB为8.1 ng/L、提取的GSM为17.8 ng/L,居民自来水中的目标物未检出。该方法操作简便、准确可靠,灵敏度高,无需有机溶剂,适合于饮用水中2-MIB和GSM的分析检测。
[Abstract]:The release of 2-methylisoborneoline (2-MIB) and soil odor (geosmin,GSM) in the source water is one of the reuse factors that cause the sudden occurrence of earthy odour in drinking water and cause the residents to panic with water. Headspace solid phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS) were used to determine 2-MIB and GSM in reservoir water, soil near reservoir and tap water of residents. Combined with orthogonal analysis, the conditions of salt addition, extraction temperature and extraction time were optimized. The qualitative and quantitative analysis of the target material was carried out under the mode of electron bombardment (EI)-selective ion scanning (SIM). The results showed that the linear relationship between the peak area of 2-MIB and GSM and their mass concentration was good in the range of 5 000 ng/L (r 2 鈮，

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