研究了火焰光度法测定硼酸盐中钾和钠含量的方法.分别在0~100 mg·L-1和0~200 mg·L-1的浓度范围内,采用差示测量法测定样品中钾和钠含量.考察了硼对钾、钠测定的影响以及钾、钠的相互影响.与四苯硼钠重量法(国家标准)相比,方法测定钾含量相对误差的绝对值≤3.91%,t检验和F检验也表明两种方法无显著性差异.与原子吸收光谱法相比,方法测定钾相对误差的绝对值≤3.63%.测定钠含量相对误差的绝对值≤3.76%,t检验和F检验表明两种方法无显著性差异.钾、钠的加标回收试验结果分别在97.5%~102.5%和97.1%~99.1%之间.

Differential flame photometry was applied to the determination of potassium and sodium in borates,and accurate results were obtained in the range of 0-100 mg·L-1 for potassium and in the range of 0-200 mg·L-1 for sodium.Interference of boron to the determination of potassium and sodium and also the mutual interference of co-existence of potassium and sodium were studied thoroughly.In comparing with the sodium tetraphenylboron gravimetric method of National Standard,results of potassium obtained by the proposed method were all lower with absolute value of relative deviation ≤3.91%,but no significant difference was found between these two methods as tested by both the t-testing and F-testing.When compared with the AAS method,absolute values of relative deviation found for potassium was ≤3.63%,and for sodium was ≤3.76%,and also no significant differences were found between the present method and the AAS method as shown by the results of both the t-testing and F-testing.Test for recovery by the standard addition method was performed and results obtained were in the ranges of 97.5%-102.5% and 97.1%-99.1% for potassium and sodium respectively.