离子色谱电导检测法测定水基胶黏剂中氨的残留

摘要

An ion chromatographic(IC) method was developed for the quantitative analysis of ammonia in water-borne adhesives. After extracted with 10 mmol/L hydrochloric acid and purified by oscillation centrifugation and filtration, the ammonia was separated by ion chromatography and detected with electrical conductivity detector. The results showed that the ammonia had a good linearity (r2 = 0. 999 8) in the range of 0. 05 -2. 0 mg/L. The detection limit(S/N = 3) was 0. 007 mg/L and the quantitation limit ( S/N= 10) was 0.024 mg/L. The average recoveries were between 93% and 102% with relative standard deviations not more than 4. 3% . The analysis of real samples verified the reliability of this method. The stability test of ammonia results suggested that the processed samples should be measured in 12 h.%建立了一种离子色谱电导检测法测定水基胶黏剂中氨残留的方法.样品经10 mmol/L盐酸水溶液振荡、离心、过滤提取后,采用阳离子交换色谱柱分离和电导检测.在优化实验条件下,样品中的氨在0.05～2.0 mg/L范围内呈良好的线性关系(r2=0.9998),加标回收率在93％～ 102％之间,相对标准偏差不高于4.3％,检出限(S/N=3)为0.007 mg/L,定量下限(S/N=10)为0.024 mg/L.结果表明该方法能够达到定量检测的目的.将该方法用于实际样品检测,结果可靠.通过对氨的稳定性实验发现,处理好的样品宜在12 h内测定.