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建立了抑制电导检测离子色谱法同时测定甲基亚磺酸钠中氯离子和硫酸根离子的方法。Cl~-和SO_4~(2-)分别在0.2~25 mg/L(r=0.999 9)和0.1~10 mg/L(r=0.999 6)浓度范围内线性关系良好,甲基亚磺酸钠中Cl~-和SO_4~(2-)的方法平均回收率分别为102%(RSD为0.36%)和101%(RSD为0.61%),检出限分别为0.011和0.014 mg/L。该方法具有线性范围良好、检出限低、操作简便、可靠等优点,可作为甲基亚磺酸钠中的Cl~-和SO_4~(2-)质量控制方法。
A method was developed for the simultaneous determination of chloride ion and sulfate ion in sodium methanesulfinate by conductivity detection-guided ion chromatography. There was a good linear relationship between Cl ~ - and SO_4 ~ (2-) in the concentration range of 0.2 ~ 25 mg / L (r = 0.999 9) and 0.1 ~ 10 mg / L The average recoveries of Cl ~ - and SO_4 ~ (2-) were 102% (RSD 0.36%) and 101% (RSD 0.61%), respectively. The detection limits were 0.011 and 0.014 mg / L, respectively. The method has the advantages of good linear range, low detection limit, simple and reliable operation, and can be used as a quality control method for Cl ~ - and SO_4 ~ (2-) in sodium methane sulfinate.