SPE-GC-ECD法测定塑料食品包装材料中的短链氯化石蜡

Determination of Short Chain Chlorinated Paraffins in Plastic Food Packaging Materials by SPE-GC-ECD

目的建立固相萃取-气相色谱法(SPE-GC-ECD)测定塑料食品包装材料中7种短链氯化石蜡(SCCPs)的检测技术。方法利用丙酮和正己烷的混合溶液在50℃下超声萃取塑料食品包装材料中7种SCCPs成分,SCCPs经硅胶固相萃取柱净化,采用气相色谱-电子捕获检测器进行定性与定量测定。结果在0.1~100.0 mg/kg范围内,SCCPs质量浓度与色谱峰面积呈良好的线性关系,线性相关系数均大于0.9997;检出限为0.01~0.10 mg/kg,加标回收率为86.4%~102.7%,相对标准偏差为1.2%~3.7%。结论该方法准确度高、精密度好、检出限低,可为塑料食品包装材料中SCCPs的检测提供新方法。

The work aims to establish the solid phase extraction-gas chromatography to determine seven short chain chlorinated paraffins（SCCPs） in plastic food packaging materials. Seven kinds of SCCPs in plastic food packaging materials were ultrasonically extracted by the mixed solution of acetone and n-hexane at 50 ℃, purified by silica gel column chromatography and qualitatively and quantitatively determined by gas chromatography-electron capture detector. In the range of 0.1～100.0 mg/kg, the mass concentration and chromatographic peak area had a good linear relation and the linear correlation coefficients were all greater than 0.9997. The detection limit ranged from 0.01 mg/kg to 0.10 mg/kg, the recoveries ranged from 86.4% to 102.7%, and RSD ranged from 1.2% to 3.7%. The method has high accuracy, good precision and low detection limit, which can provide a new method for the detection of SCCPs in plastic food packaging materials.