Pedosphere 2(4): 317--326, 1992
ISSN 1002-0160/CN 32-1315/P
©1992 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Adsorption of Chloride, Nitrate and Perchlorate by Variable Charge Soils |
| JI GUO-LIANG, KONG XIAO-LING |
| Institute of Soil Science. Academia Sinica, P. O. Box 821, Nanjing 210008 |
| ABSTRACT |
| Two cells consisting of a chloride-selective electrode and a nitrate-selective electrode or of a chloride-selective electrode and a perchlorate-selective electrode were directly put in the soil suspension to determine the concentration ratios Cl-/ NO3- or Cl-/ ClO4- for studying the adsorption of the three anions by variable charge soils. It was found that all the concentration ratios CCl- / CNO3- and CCl- / CClO4- in suspension were smaller than unity when soil samples were in equilibrium with mixed KCl and KNO3 or KCl and KClO4 solutions of equal concentration. The order of the amount of chloride, nitrate and perchlorate adsorbed by variable charge soils was Cl-> NO3-> ClO4- when the soils adsorbed these anions from the solution containing equal concentrations of Cl-, NO3- and ClO4-. Such factors as the pH of the suspension, the iron oxide content of the soil etc. could affect the amounts and the ratios of anions adsorbed. |
| Key Words: |
| Citation: Ji, G. L. and Kong, X. L. 1992. Adsorption of Chloride, Nitrate and Perchlorate by Variable Charge Soils. Pedosphere. 2(4): 317-326. |
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