30%亚硫酸氢钠溶液样品中Cl-和SO2-4的同时测定

建立了采用离子色谱测定30%亚硫酸氢钠溶液样品中的氯化钠和硫酸钠含量的新方法。采用IonPac AS14分析柱，选择三乙醇胺为亚硫酸氢钠的稳定剂,以丙酮为有机改进剂，淋洗液组成为1.5 mol/L Na2CO3-3.5 mol/L NaHCO3-10% （体积分数）(CH3)2CO,流速为1.0 mL/min,抑制电导检测。实验结果表明，氯离子、硫酸根离子分别在0.05~1.5 mg/L,0.20~15 mg/L时，其峰面积与质量浓度呈线性关系，相关系数均大于0.999，检出限分别为0.01 mg/L和0.03 mg/L。该法用于实际样品分析,操作便捷,结果可靠。

Simultaneous Determination of Cl- and SO2-4 in 30% Sodium Bisulfite Solution Samples by Ion Chromatography

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.