用电位滴定法测定工业用氢氧化钠中氢氧化钠和碳酸钠的含量

Determination of Sodium Hydroxide and Sodium Carbonate of Industrial Sodium Hydroxide by Potentiometric Titration

目前GB/T4348.1-2000测定工业用氢氧化钠中氢氧化钠和碳酸钠含量时,采用的是化学滴定法,而随着分析技术的发展,用电位滴定法是必然趋势。能够采用电位滴定法代替化学滴定法的前提条件是电位滴定法的准确度和精密度均满足国标的要求。用瑞士Metrohm682电位滴定仪对大量样品进行测定,数据表明,电位滴定法的准确度和精密度可以满足国标的要求。

According to national standard GB/T4348.1-2000, we determinate sodium hydroxide and sodium carbonate of industrial sodium hydroxide with traditional chemical titration. Now, with the development of analytic technology, the trend of analysis is potentiometric titration. The premise of applying potentiometric titration is that the accuracy and precision of potentiometic titration can meet with the requirements of national standard. We determinate many samples applying Switzerland Metrohm 682 titroprocessor. The results obtained show that the accuracy and precision of the methed can meet with the requirements of national standard.