沉淀分离-气相色谱法测定聚氯乙烯塑料制品中的磷酸甲苯酯类增塑剂

建立了沉淀分离前处理技术结合气相色谱法测定聚氯乙烯塑料制品中磷酸甲苯酯类增塑剂含量的分析方法.采用四氢呋喃作溶剂将聚氯乙烯塑料溶解,以甲醇为沉淀剂,有效地将增塑剂从聚合物中分离出来,再采用气相色谱-火焰光度检测器进行分析.磷酸甲苯酯的3种异构体在0.1～2.0 mg/L范围内线性关系良好,相关系数大于0.999,方法平均回收率在82.9％～99.1％之间,测定结果的相对标准偏差为0.8％～5.9％,方法的检出限为50 mg/kg.本方法操作简便,准确性好,适用于聚氯乙烯塑料中磷酸甲苯酯类增塑剂含量的测定.

Determination of Tricresyl Phosphate Plasticizer in Polyvinylchloride Plastic by Precipitation Separation-Gas Chromatographic Method

A method was established for the determination of tricresyl phosphate(TCP) plasticizer in polyvinylchloride(PVC) plastic by precipitation separation pretreatment and gas chromatographic(GC) method.The sample was dissolved by tetrahydrofuran(THF),and methanol was added into the solution to produce PVC precipitates,then the tricresyl phosphate was effectively separated from PVC polymer.Tricresyl phosphate in the solution was analyzed by GC with flame photometric detector(FPD).The linear range of the determination was 0.1-2.0 mg/L with the correlation coefficient of 0.999.The average recoveries ranged from 82.9% to 99.1%,and the RSD ranged from 0.8% to 5.9%.The detection limit was as low as 50 mg/kg.This developed method is simple,effective and suitable for the determination of tricresyl phosphate plasticizer in polyvinylchloride plastic.