液液微萃取气相色谱测定水中邻苯二甲酸二(2-乙基己基)酯

Rapid Determination of Di-(2-ethylhexyl)-phthalate by Liquid-Liquid Micro-extraction and Gas Chromatography

以甲基叔丁基醚为萃取剂，采用液液微萃取和氢火焰离子化检测器气相色谱法，实现了对水中邻苯二甲酸二（2一乙基己基）酯的快速测定。该方法的检测下限可以达到1μg/L，当水中目标物的浓度为0．05～5mg／L时，该方法的检测相对标准偏差（RSD）均小于5．1％，加标回收率为96％～116％。对于各种不同浓度的目标物，该方法均具有较好的测定精密度和准确度。对实际污水样的测定结果表明，该方法可用于水中邻苯二甲酸二（2-乙基己基）酯的快速定性定量分析。

Using methyl tea-butyl ether as extractant, the concentration of di-（ 2-ethylhexyl）- phthalate （DEHP） in water was rapidly determined by liquid-liquid micro-extraction and gas chromatog- raphy with hydrogen flame ionization detector （FID）. The lower detection limit of the method is 1 Ixg/L. When the concentration of the target in water is 0.05 to 5 rag/L, the relative standard deviation is less than 5.1%, and the recovery rate with standard addition is 96% to 116%. This method has better preci- sion and accuracy, and it can be used to quickly determine trace concentration of DEHP in water.