液液萃取-气相色谱-质谱法测定涉水管材水浸液中17种邻苯二甲酸酯类化合物

Determination of 17 phthalate esters in water soaking solution of plastic pipes for water supply by gas chromatography-mass spectrography

目的建立涉水改性聚丙烯（PP-R）塑料管材水浸液中的17种邻苯二甲酸酯类化合物的液液萃取-气相色谱-质谱方法,并应用于市售涉水塑料管材的抽样调查。方法对色谱分离条件进行了优化,并对市面上的多种不同品牌的塑料管进行了水浸泡取样,采用液液萃取-气相色谱-质谱方法,对浸出量及其影响因素进行了研究。结果浸泡温度、pH值、浸泡时间均对邻苯二甲酸酯类化合物的浸出量有影响。当浸泡温度高于50℃时,浸出量会明显增加;pH值为5.0~9.0,p H值越低,邻苯二甲酸酯的浸出量越大;浸泡时间越长,浸出量越高。邻苯二甲酸二甲酯、邻苯二甲酸二乙酯、邻苯二甲酸二丁酯、邻苯二甲酸二异丁酯和邻苯二甲酸二（2-乙基己基）酯在塑料给水管中浸泡液中均有检出。结论该方法快速、有效,可用于给水管材中17种邻苯二甲酸酯类塑化剂的检测。

Objective To establish a method for the simultaneous determination of 17 phthalate esters in water soaking solution from polypropylene random（ PP-R） water-supply pipes by gas chromatography-mass spectrometry（ GC-MS）,and to investigate the phthalate esters leaching content from plastic water-supply pipes. Methods The chromatographic and separation method was optimized. Different brands of plastic water pipes were collected and soaked; the content of phthalate esters in water soaking solution from plastic water-supply pipes were detected by combination of liquid-liquid extraction and gas chromatography-mass spectrometry. Results The soaking temperature,p H,and time have influences on the concentration of phthalate esters in soaking solutions. The concentrations increased significantly when the temperature increased up to 50 ℃,and the leaching amount would be significantly increased. When p H value was within 5. 0-9. 0,the lower p H was,the higher of the leaching amount of Phthalate Esters was Five PAEs were detected in the soaked water samples of these water-supply product,namely Dimethyl phthalate（ DMP）,Diethyl phthalate（ DEP）,Diisobutyl phthalate（ DIBP）,Di-n-butyl phthalate（ DBP）,and Di（ 2-ethylhexyl） phthalate（ DEHP）. Conclusion This method is simple,accurate,and it is suitable for the determination of the 17 phthalate esters in water samples soaked from plastic water-supply pipes.