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以钾钠电极互为参比,采用一次标准加入法可以分别求出钾钠离子的浓度。电极的测定斜率为:钾53.9mV,钠52.7mV。标准混合物的测定误差分别为:钾-0.23％～+2.4％,钠-1.5％～+4.7％。实验中采用0.5mol/L BaCl_2溶液作为浸提剂及离子强度调节剂,电位法同时测定了5种不同盐化程度的(土娄)土、潮土及水稻土中钾钠的含量。回收率为:钾98.7％～102％,钠98.6％～102％.以火焰光度法作为对照,其结果与电极法完全一致。
Potassium sodium electrode to each other as a reference, using a standard addition method can be obtained separately sodium potassium concentration. The measured slope of the electrode was: potassium 53.9 mV, sodium 52.7 mV. The standard error of the determination of the mixture were: potassium -0.23% ~ + 2.4%, sodium -1.5% ~ + 4.7%. In the experiment, 0.5 mol / L BaCl 2 solution was used as extractant and ionic strength regulator. The potentials were used to determine the contents of potassium and sodium in (Lou) soil, Chao soil and paddy soil with different salinities. The recoveries were 98.7% ~ 102% potassium and 98.6% ~ 102% sodium, and the results were consistent with the electrode method by flame photometry.