饮用水中苯系物的顶空气相色谱测定法

刘利亚; 王娅芳; 张卫国

饮用水中苯系物的顶空气相色谱测定法

Determination of Benzene by Headspace Gas Chromatography in Drinking Water

摘要

摘要:
目的探讨饮用水中7种苯系物(苯、甲苯、乙苯、邻二甲苯、间二甲苯、对二甲苯、苯乙烯)在顶空分离时气相与液相之比和顶空平衡温度的关系。
方法水样经气液平衡后, 用FFAP毛细管柱分离, FID检测器测定水中苯系物含量。
结果当气液相比为4:6, 平衡温度为50℃时, 7种苯系物最低定量浓度为0.0023~0.0063 mg/L, 相对标准偏差RSD为6.71%~1.89%, 实际样品的加标回收率为96.6%~103.9%。
结论在选定的平衡温度、气液相之比条件下, 水中苯系物回收率和重复性较好, 能满足限值规定的检出限要求。

Abstract:
Objectives To explore the relationship between balance temperatures and gas-liquid ratios of seven kinds of Benzene compounds(benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, styrene)in drinking water during headspace separations.
Methods Contents of benzene in drinking water in diffrernt headspace were detemined after gas-lipuild balanced by GC FID detector and FFAP capillary column.
Results When gas-liquid ratio was 4:6, the equilibrium temperature was 50℃, the lowest detectable concentration of seven kinds benzene was 0.0023~0.0063 mg/L, RSD of the method was 6.71%~1.89%, the spiked recovery rate was 96.6%~103.9%.
Conclusions With the selected balance temperature and gas-liquid ratio, benzene compounds in water have better recovery and repeatability, and have satisfactory required detection limit.

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