热容冷结晶-电感耦合等离子体发射光谱法测定高纯硼酸中的钾、钠、钙、镁、硫酸根

Determination of potassium, sodium, calcium, magnesium and sulfate in high-purity boric acid by cold crystallization-inductively coupled plasma atomic emission spectrometry

利用硼酸在水中的溶解度的变化先热容硼酸再冷结晶析出硼酸,杂质元素K、Na、Ca、Mg、SO_4^(2-)留在溶液中,用电感耦合等离子体发射光谱法测定。在标准系列中加入定量基体并做了加标回收试验,回收率在97%～103%之间,分析误差在化学分析允许的范围内,检出限和精密度都非常好。该方法快速准确,简便易行,能代替原有的原子吸收光谱法等化学分析方法。

Summary of the solubility of boric acid in water first heat capacity boric acid and then cold junction Crystal precipitated boric acid,impurity elements potassium,sodium,calcium,magnesium,sulfate ions remain in the solution,inductively coupled plasma atomic emission spectrometry determination.Adding the quantitative matrix to the standard series and doing the spike recovery test,the recovery rate is between 97%-103%,the analysis error is within the allowable range of chemical analysis,the detection limit and the precision are very good.The method is fast,accurate and simple,and can replace the original method of chemical analysis such as atomic absorption spectrometry.