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利用火焰光度法测定水样中钾离子,高含量钠对钾测定有一定的影响。为此,本文通过对0.50 mg/L、2.00 mg/L、5.00 mg/L、10.00 mg/L、20.00 mg/L钾的标准溶液中分别加入50~3 000 mg/L不同浓度的钠进行了实验,探讨了不同浓度的钠对钾测定的影响,即对于钾的浓度小于5.00 mg/L时,钠的浓度对钾的测定结果影响不明显;对于钾的浓度大于5.00 mg/L时,钠的浓度将影响钾的测定结果,且随着钾离子含量增加,高含量钠对钾的测定影响越明显,造成测定结果偏低。
The potassium ion in water samples was determined by flame photometry. The high content of sodium had a certain influence on the determination of potassium. For this reason, we added 50 ~ 3 000 mg / L different concentrations of sodium into standard solutions of 0.50 mg / L, 2.00 mg / L, 5.00 mg / L, 10.00 mg / L and 20.00 mg / L potassium respectively The effects of different concentrations of sodium on the determination of potassium were investigated. When the concentration of potassium was less than 5.00 mg / L, the effect of sodium on the determination of potassium was insignificant. When the concentration of potassium was more than 5.00 mg / L, sodium Of the concentration will affect the determination of potassium, and with the increase of potassium content, the higher the sodium content of potassium on the determination of the more obvious, resulting in lower measurement results.