罐采样-冷聚焦-GC/MS法测定环境空气中57种臭氧前体物
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摘要
建立了苏码罐采样-冷聚焦-GC/MS测定环境空气中57种臭氧前体物的方法,空气样品进样量400 mL,用100%聚二甲基硅氧烷柱分离,通过选择色谱起始柱温、设置质谱离子扫描范围和优化冷阱捕集流速、捕集流量消除了实际样品中二氧化碳等物质对低沸点目标化合物的干扰,通过优化冷阱解析温度和阀温改善了高沸点目标化合物的线性范围问题。实验结果表明,该方法目标化合物平均响应因子相对标准偏差均在20%以内,检出限为0. 13～0. 95μg/m3,精密度均小于10%,能较好地应用于环境空气中57种臭氧前体物的定性、定量分析。
A method for simultaneous determination of 57 kinds of ozone precursors in ambient air was developed based on summa canisters-cryofocus-GC/MS. 400 m L air sample was separated by DB-1 MS column. Interference of carbon dioxide on low boiling target compounds was improved by optimizing the starting temperature of the column,the mass scanning range the capture flow rate and flow of cold trap.A good linear range of n-Dodecane was obtained by optimizing the temperature of the cold trap desorption and valve. The average response factor of the standard curve was less than 20%. The detection limit was in the ranges of 0. 13 μg/m3 to 0. 95 μg/m3,and the precision was less than 10%.The method can be used for the qualitative and quantitative analysis of 57 kinds of ozone precursors in ambient air.
A method for simultaneous determination of 57 kinds of ozone precursors in ambient air was developed based on summa canisters-cryofocus-GC/MS. 400 m L air sample was separated by DB-1 MS column. Interference of carbon dioxide on low boiling target compounds was improved by optimizing the starting temperature of the column,the mass scanning range the capture flow rate and flow of cold trap.A good linear range of n-Dodecane was obtained by optimizing the temperature of the cold trap desorption and valve. The average response factor of the standard curve was less than 20%. The detection limit was in the ranges of 0. 13 μg/m3 to 0. 95 μg/m3,and the precision was less than 10%.The method can be used for the qualitative and quantitative analysis of 57 kinds of ozone precursors in ambient air.
引文
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