离子色谱法测定土壤中氯离子、硫酸根离子、硝酸根离子

摘要

建立离子色谱法测定土壤中Cl-,SO42-,NO3-3种阴离子的含量.淋洗液为30 mmol/L KOH溶液,等浓度淋洗,流速为1.0 mL/min.Cl-,SO42-,NO3-的线性范围均为0～20 mg/L,线性相关系数均大于0.9999,检出限为0.051～0.082 mg/L,混合标准溶液测定结果的相对标准偏差为0.31～0.38％(n=10).对土壤样品进行重复测定,3种离子测定结果的相对标准偏差均小于3％(n=7),加标回收率在95.0％～104.5％ 之间.该方法测定结果准确,操作简单、快速,适用于土遗址中Cl-,SO42-,NO3-的测定.%The ion chromatography for determining the anions of Cl-,SO42-,NO3- in soil was established. The eluent was 30 mmol/L KOH solution, isocratic elution with flow rate of 1.0 mL/min. The linear ranges of Cl-, SO42- , NO3-were 0-20 mg/L,the linear correlation coefficients were more than 0.9999. The detection limits were 0.051-0.082 mg/L for three kinds of anions,the relative standard deviations of mixed standard solution determination results were 0.31％-0.38％(n=10). The relative standard deviations of repetitive determination for soil samples were less than 3％(n=7). The recoveries ranged from 95.0％ to 104.5％. The method is simple to operate and the result is accurate,so it is suitable for the determination of Cl-,SO42- and NO3- in earthen ruins.