火焰光度法测定循环水中K^+时Ca^(2+)的干扰及消除

Interference and Elimination of Ca^(2+) in Determining K^+ in Recirculating Water by Flame Photometric Method

通过实验研究了以火焰光度法测定循环水中K^+时Ca^(2+)对测定结果的干扰及消除干扰的方法。结果表明,随着水中Ca^(2+)浓度的增加,测定结果的误差增大。当水样中的Ca^(2+)浓度大于300mg/L时,需要对其干扰进行消除。采用稀释法、干扰离子等量校正法和干扰离子去除法均能够较好地消除Ca^(2+)对测定结果的影响,但后两种方法操作相对比较复杂。

It had been investigated that interference and elimination of Ca^2＋ in determining K^＋ in recireulating water by flame photometric method. The results showed that the error increased with the increase of Ca^2＋ concentration. The interference of Ca^2＋ should be eliminated when Ca^2＋ concentration was higher than 300mg/L. Three methods could be used to eliminate the interference preferably： （1） diluting the raw water; （2） adding Ca^2＋ as same amount as the raw water to K^＋ standard solution; （3） eliminating Ca^2＋ from the raw water. The last two methods operated more tediously than the first one.