摘要
用稀硫酸吸收,离子色谱法测定乙烯中微量的氨,对吸收瓶、吸收溶液的浓度进行选择,同时对方法的吸收效率、加标回收率、检出限、精密度进行测试.该方法快速、简便,不需要复杂的样品前处理,完成一次测定只需16min.该方法检出限为0.003 mg/L,当采样体积为100L时,最低检出浓度为0.003 mg/m3.样品测定结果的相对标准偏差为2.8%(n=4),加标回收率为93.8%～109%.
Sulfuric acid used as the absorbing solution, ammonia in ethylene was determined by ion chromatography. Comparing with the other methods, such as photometric method, titration method and selective electrode method, this method could be operaed simply without complicated pretreatment for samples. IonPac CS12A separation column and IonPac CG12A protection column were used in the test. The mobile phase composed of 20 mmol/L MSA solution was used at a flow rate of 1.0 mL/min. Linear relationship was found in the range of 0.05 - 40 mg/L with the correlation coefficient of 0. 993. Detection limit was 0. 003 mg/L for ammonia. When sampling volume was 100 L, the limit concentration for the determination was 0.003 mg/m^3. The relative standard deviation was 2.8% （ n =4）, and the recoveries of samples were 93.8% - 109%.
出处
《化学分析计量》
CAS
2005年第6期12-14,共3页
Chemical Analysis And Meterage
关键词
氨
阳离子检测
离子色谱法
乙烯
ion chromatographic, cation detection, ammonia, ethylene
