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目的建立同时测定饮水中35种增塑剂的气相色谱-质谱(GC-MS)分析方法。方法采用乙酸乙酯反复萃取待测组分,经过无水硫酸钠去除残余水分后,经氮吹浓缩至1 ml,由DB-5MS色谱柱程序升温分离,选择离子监测模式(SIM)定性检测,外标法定量。结果该方法线性范围在0.05~2.0 mg/L之间,相关系数r2≥0.995,方法检出限为0.0001~0.001 mg/L,定量限0.0004~0.004 mg/L。35种增塑剂平均回收率在65%~118%,相对标准偏差为1.7%~11.5%。结论该方法操作简单、稳定、可靠,可以满足饮水中多种类增塑剂的同时分析的要求。
Objective To establish a gas chromatography-mass spectrometry (GC-MS) method for simultaneous determination of 35 plasticizers in drinking water. Methods The components were extracted repeatedly by ethyl acetate, and the residual moisture was removed by anhydrous sodium sulfate. After the solution was concentrated to 1 ml by nitrogen, the sample was heated and separated by DB-5MS column chromatography, and qualitatively detected by SIM (selective ion monitoring mode) External standard method. Results The linear range of this method was between 0.05 and 2.0 mg / L with a correlation coefficient of r2 ≥ 0.955. The limits of detection were 0.0001 ~ 0.001 mg / L and the limits of quantitation were 0.0004 ~ 0.004 mg / L. The average recoveries of 35 plasticizers ranged from 65% to 118% with relative standard deviations of 1.7% to 11.5%. Conclusion The method is simple, stable and reliable, and can meet the requirements of simultaneous analysis of various plasticizers in drinking water.