采用离子色谱法测定橡塑保温材料中的F-、HCOO-、Cl-、CNO-、NO3-、SO42-等6种阴离子。样品经粉碎后,以水作为提取剂,90 ℃振荡水浴提取24 h,用0.22 μm微孔滤膜过滤后,以碳酸钠-碳酸氢钠缓冲溶液为淋洗液采用阴离子交换柱分离,电导检测器检测。6种阴离子的质量浓度在一定范围内与峰面积呈线性关系,检出限(3S/N)在3.5~37.6 μg·L-1之间。加标回收率在95.3%~106%之间,测定值的相对标准偏差(n=6)小于1.5%。

Ion chromatography was applied to the determination of 6 anions, i.e., F-, HCOO-, Cl-, CNO-, NO3- and SO42- in rubber and plastic thermal insulation materials. After broken to pieces, the samples were extracted with water at 90 ℃ for 24 hours in a shaking water bath. Then 6 target anions were separated by anion exchange chromatography with Na2CO3/NaHCO3 buffer solution as eluant and detected by electro-conductivity detector.The linear relationships were found between values of peak area and mass concentrations of the 6 anions in definite ranges, with detection limits (3S/N) in the range of 3.5-37.6 μg·L-1. Recovery found by standard addition method were in the range of 95.3%-106% and RSD′s (n=6) were all below 1.5%.