材料期刊网

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5~1000 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3.0~3.6 ng／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。

The odorous compounds of 2-methylisoborneol(2-MIB)and geosmin(GSM)heavi-ly produced and released in water source are one of the most important factors leading to off-flavor emergencies and resident water consumption panic in drinking water. A headspace solid phase micro-extraction ( HS-SPME ) combined with gas chromatography-mass spectrometry ( GC-MS)method was established for the simultaneous determination of these two trace earthy and musty compounds in reservoir water,reservoir soil and tap water. The conditions of HS-SPME,such as salt amount,extraction time and extraction temperature,were optimized based on orthogonal analysis. The qualitative and quantitative analyses of 2-MIB and GSM were carried out in the electron impact( EI)-selective ion scanning mode. The results showed that the linear relationship between peak area and concentration of 2-MIB and GSM was good enough( r 2≥0. 998)from 5 to 1 000 ng/L,the limits of detection were 0. 72 ng/L for 2-MIB,0. 34 ng/L for GSM and the limits of quantification were 2. 40 ng/L for 2-MIB,1. 13 ng/L for GSM. When the target samples spiked in the range of 10-600 ng/L,the average recoveries of the target com-pounds were 93. 6%-107. 7%( RSD≤6. 1%,n=6 ). Based on the above method,the target
compounds in reservoir water,reservoir soil and tap water in a certain region of Liaoning Prov-ince were analyzed. The results showed that the two target odors in reservoir water were 3. 0-3. 6 ng/L. As for the extract of the soil around the reservoir,2-MIB was 8. 1 ng/L and GSM was 17. 8 ng/L. The odorous substances were not detected in the tap water. This method is simple, accurate,reliable,highly sensitive and no need of organic solvents. And it is suitable for the detection of 2-MIB and GSM in drinking water.