膜萃取-气相色谱／微分离子迁移谱检测水中的1，4-二恶烷

摘要

利用膜萃取-气相色谱/微分离子迁移谱（ME-GC / DMS）对水中的1，4-二恶烷污染物进行了检测。考察了射频电压、采样流速、膜渗透时间、Trap 预富集时间等参数对检测二恶烷的影响规律。结果显示：在优化条件下，二恶烷的定量线性范围为2.0~20.0μg / L，检出限为0.67μg / L。实验证明，二恶烷与5种氯代烃的混合物在 ME-GC /DMS 的二维分离谱图中得到特异性响应，增加了识别的准确性。该研究为发展现场实时监测地下水中污染物的方法提供了重要参考。%The method of detecting trace 1,4-dioxane in water using membrane extraction cou-pled with gas chromatography / differential mobility spectrometry( GC / DMS)was developed. The parameters including radio frequency voltage,sampling flow rate,permeation time and trapping time were optimized to 1000 V,50 mL / min,30 min and 150 s,respectively. The linear range for dioxane was obtained from 2. 0 μg / L to 20. 0 μg / L. The LOD was found to be 0. 67μg / L. The specificity towards 1,4-dioxane in the presence of five chlorinated hydrocarbons was improved by using two-dimensional GC separation with optimized DMS compensation voltage. This method paves a way for developing field-deployable sensors for real-time monitoring con-taminants in groundwater.