气相色谱法测定环境空气中乙醇和异丙醇

采用蒸馏水吸收空气中的乙醇和异丙醇，气相色谱法测定，该方法在3．14 mg/L ～15．8 mg/L 范围内线性良好，乙醇标准曲线的相关系数为0．9994，异丙醇标准曲线的相关系数为0．9996。测定低浓度标准溶液，得到乙醇和异丙醇的检出限分别为0．418 mg/L 和0．399 mg/L；采样体积为0．04 m3时，乙醇和异丙醇最低检出质量浓度均为0．05 mg/m3。乙醇和异丙醇标准溶液的回收率为95．4％～104％，RSD＜5％。样品稳定性试验表明，采集的乙醇和异丙醇样品保存时间越长损失率越大，一般保存7 d为宜。

Simultaneous Determination of Ethanol and Isopropanol in Ambient Air by Gas Chromatography

Ethanol and isopropanol in the ambient air were sampled by using distilled water as absorption solution.The absorption solution was determined by gas chromatography.The method showed good linearity in the range of 3.14 mg/L～15.8 mg/L.The correlation coefficients of ethanol and isopropanol were 0.999 4 and 0.999 6,respectively.The detection limit of ethanol and isopropanol were 0.418 mg/L and 0.399 mg/L by de-termination of low concentration of standard solutions.When the sampling volume was 0.04 m3 ,the minimum de-tectable concentration of ethanol and isopropanol were both 0.05 mg/m3 .The recovery of ethanol and isopropanol standard solution was 95.4%～104%,with the RSD〈5%.The stability test showed that the shelf life of sample was less than 7 days.