高分子复合材料中残余甲醛的萃取及高效液相色谱分析

Extraction of Residual Formaldehyde in Polymer Complex and High Performance Liquid Chromatographic Analysis

依据顶空 /气 液平衡原理 ,较为系统地研究了高分子复合材料中残余甲醛的萃取及高效液相色谱定量分析方法 ,探讨了影响萃取率的主要因素 ,进行了萃取及色谱分离条件的优化 ,并实现了复合材料中微量残余甲醛的准确定量测定。方法检测限为 0 1mg/kg ;相对标准偏差小于 5 % ,加标回收率为 96 %～ 10 3%。

This paper presents a simple and accurate method for analyzing formaldehyde in polymer complex by headspace extraction derivatization and HPLC analysis The sample preparation of formaldehyde in polymer complex was based on a simple thermodynamic equilibrium in a closed and thermostat jar, and the gaseous formaldehyde in equilibrium could be absorbed and extracted by the liquid in the bottom of the jar The formaldehyde was derivatized with 2,4 dinitrophenyl hydrazine before chromatography. The influences of temperature, equilibrium time, sample quantity and geometric form on the extraction efficiency were studied The extraction and HPLC conditions were optimized The limit of detection (LOD) was 0 1 mg/kg, and the relative standard deviation (RSD) was below 5%, and the recoveries were between 96% 103% As a result, this method would meet the demands for analyzing microamounts of residual formaldehyde in polymer complex