| Direct Determination of Potassium-Sodium Activity Ratio in Soil Suspension with Two Ion-Selective Electrodes |
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| 作者姓名： | LI HONG-YAN JI GUO-LIANG |
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| 作者单位： | [1]InstituteofSoilScience,AcademiaSinica,P.O.Box821,Nanjing210008（China） [2]InstituteofSoilScience,Academia |
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| 摘 要： | A K^ -selective electrode and a Na^ -selective electrode were used to construct a measuring cell without liquid-junction for the determination of the ion activity ratio of K^ to Na^ in soil suspensions.The measured cell potential was not affected by the total electrolyte concentration when the total cation concentration was 10^-1-10^-3 mol L^-1 and the concentration ratio Ck /CNa was 10:1 to 1:50.When the concentration ratios were equal to 1 and the total electrolyte concentrations were 10^-2 and 10^-3 mol L^-1,the ion activity ratio measurenent would not be affected by pH in the pH range of 3.5 to 11.5 and 4.4 to 11 respectively.Ions other than H^ have no remarkable influence on the measurement.The ion activity ratio of K^ to Na^ measured directly in soil suspension agree well with those in centrifuged supernant solution.The relative deviation was within 4%.From the measured ion activity ratio,the difference of the bonding energies of K^ and Na^ ions was calculated.
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| 关 键 词： | 钠离子 钾离子 电极活性 离子选择电极 土壤悬浮液 |
Direct Determination of Potassium-Sodium Activity Ratio in Soil Suspension with Two Ion-Selective Electrodes |
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| LI HONG-YAN,JI GUO-LIANG.Direct Determination of Potassium-Sodium Activity Ratio in Soil Suspension with Two Ion-Selective Electrodes[J].Pedosphere,1991,1(4):363-369. |
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| Authors: | LI HONG-YAN and JI GUO-LIANG |
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| Institution: | Institute of Soil Science, Academia Sinica, P O. Box82l, Nanjing 210008;Institute of Soil Science, Academia Sinica, P O. Box82l, Nanjing 210008 |
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| Abstract: | A K^ -selective electrode and a Na^ -selective electrode were used to construct a measuring cell without liquid-junction for the determination of the ion activity ratio of K^ to Na^ in soil suspensions.The measured cell potential was not affected by the total electrolyte concentration when the total cation concentration was 10^-1-10^-3 mol L^-1 and the concentration ratio Ck /CNa was 10:1 to 1:50.When the concentration ratios were equal to 1 and the total electrolyte concentrations were 10^-2 and 10^-3 mol L^-1,the ion activity ratio measurenent would not be affected by pH in the pH range of 3.5 to 11.5 and 4.4 to 11 respectively.Ions other than H^ have no remarkable influence on the measurement.The ion activity ratio of K^ to Na^ measured directly in soil suspension agree well with those in centrifuged supernant solution.The relative deviation was within 4%.From the measured ion activity ratio,the difference of the bonding energies of K^ and Na^ ions was calculated. |
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