离子选择性电极法测定工业碳酸钠中氯化物的研究

Research on Determination of Chloride in Industrial Sodium Carbonate by Ion Selective Electrode Method

文章建立了氯离子选择电极-标准曲线法测定工业碳酸钠中的氯化物含量,研究了pH值和温度对测定结果的影响,通过方法学实验证明:本方法的检出限为0.002 2%,氯离子浓度在0~500 mg/L的线性范围内呈现良好的线性关系,相对标准偏差为0.99%~2.41%,加标回收率为96.5%~99.3%。该方法检出限低,精密度好,准确度高,适用于工业碳酸钠中的氯化物的测定。

In this paper,the chloride ion selective electrode-standard curve method was established for the determination of chloride content in industrial sodium carbonate.The effects of pH value,and temperature on the determination results were studied.The methodological experiments proved that:the detection limit of this method was 0.0022%,the chloride ion concentration showed a good linear relationship in the linear range of 0~500 mg/L,the relative standard deviation was 0.99%~2.41%,and the recoveries were 96.5%~99.3%.The method has low detection limit,good precision and high accuracy,and is suitable for the determination of chloride in industrial sodium carbonate.