[离子色谱法同时测定30%亚硫酸氢钠溶液样品中的Cl⁻和SO₄²⁻]

[Simultaneous determination of Cl- and SO4(2-) in 30% sodium bisulfite solution samples by ion chromatography].

作者信息

Lu Keping

机构信息

Inspection Center of Anqing Company, China Petroleum & Chemical Corporation, Anqing 246002, China.

出版信息

Se Pu. 2005 Mar;23(2):205-7.

PMID:16013571

Abstract

A novel method for simultaneous determination of Cl- and SO4(2-) in 30% sodium bisulfite solution samples by ion chromatography was established. A sample was pretreated with triethanolamine (TEA) to prevent sulfite from becoming sulfate. The mixture solution of 1.5 mol/L Na2CO3-3.5 mol/L NaHCO3-10% (v/v) (CH3)2CO was used as eluent with a flow rate of 1.0 mL/min. The injection volume was 25 microL. The separation was performed on an IonPac AS14 column and detected by suppressed conductivity with external acid mode. Both Cl- and SO4(2-) have good linearity in the ranges of 0.05 - 1.5 mg/L and 0.20 - 15 mg/L with correlation coefficients above 0.999 and the detection limits of Cl- and SO4(2-) were 0.01 and 0.03 mg/L, respectively. The proposed method is simple and rapid and has been successfully applied to the analysis of 30% sodium bisulfite samples. The entire process of analysis is completed within 12 min.

摘要

建立了一种离子色谱法同时测定30%亚硫酸氢钠溶液样品中Cl-和SO4(2-)的新方法。样品用三乙醇胺（TEA）预处理以防止亚硫酸盐转化为硫酸盐。以1.5 mol/L Na2CO3-3.5 mol/L NaHCO3-10%（v/v）（CH3）2CO混合溶液为洗脱液，流速为1.0 mL/min。进样体积为25 μL。在IonPac AS14柱上进行分离，采用外酸模式抑制电导检测。Cl-和SO4(2-)在0.05 - 1.5 mg/L和0.20 - 15 mg/L范围内均具有良好的线性，相关系数均大于0.999，Cl-和SO4(2-)的检出限分别为0.01和0.03 mg/L。该方法简单快速，已成功应用于30%亚硫酸氢钠样品的分析。整个分析过程在12分钟内完成。