DETERMINATION OF 60 VOLATILE ORGANIC COMPOUNDS IN GROUNDWATER OF ENTERPRISE LAND OF KEY INDUSTRIES
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摘要:
建立了吹扫捕集-气相色谱质谱法测定重点行业企业用地地下水中60种挥发性有机物的分析方法.采用屈臣氏双蒸水作为空白水，选择离子与全扫描模式交替方式进行定性定量，确定了保护剂的种类和用量，优化了吹扫捕集条件.方法检出限范围在0.3~1.2 μg/L.该方法的线性范围为0~250 μg/L，相关系数R2在0.9907~0.9999之间，3种不同浓度的加标平均回收率为87.2%~117%，相对标准偏差在1.7%~9.7%之间，优于《重点行业企业用地调查质量保证与质量控制技术规定(试行)》对地下水挥发性有机物的质控要求.本方法增加了VOCs的测试种类，线性范围宽，灵敏度高，适合于各类重点行业企业用地地下水中60种挥发性有机物的快速批量分析.
Abstract:The purge and trap gas chromatography-mass spectrometry(GC-MS) is established for the determination of 60 volatile organic compounds (VOC) in groundwater of enterprise land of key industries. The purge and trap conditions are optimized by selecting Watsons double-distilled water as blank water, ion and full scanning alternating mode for qualitative-quantitative analysis and determination of types and dosages of protective agent. The detection limit of the method is 0.3-1.2 μg/L, with the linear range of 0-250 μg/L, and correlation coefficient(R2) of 0.9907-0.9999. The spiked average recovery of three different concentrations are 87.2%-117%, with the relative standard deviation of 1.7%-9.7%, which is better than the quality control requirements of "Technical Specifications on Quality Assurance and Control of Survey for Enterprise Land of Key Industries (Trial)" for VOCs in groundwater. The method adds test types of VOCs, with wide linear range and high sensitivity, suitable for rapid batch analysis of 60 VOCs in groundwater of enterprise land of various key industries.
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表 1 空白试剂水的选择
Table 1. Selection of blank reagent water
试剂水 屈臣氏双蒸水 娃哈哈纯净水 实验室自制蒸馏水 处理过程 高纯氮气通气30 min 高纯氮气通气30 min 煮沸10 min后，高纯氮气通气30 min 二氯甲烷、三氯甲烷的检出情况 未检出 二氯甲烷检出 二氯甲烷、三氯甲烷均有检出 
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