Pedosphere 1(2): 109--116, 1991
ISSN 1002-0160/CN 32-1315/P
©1991 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Studies on Oxidation States of Cobalt Extracted from Soils with EDTA·HO Ac·NH4OAc |
| CAI ZU-CONG, LIU ZHENG |
| Institute of Soil Science, Academia Sinica, P. O. Box 821, Nanjing |
| ABSTRACT |
| A method determining di-and tri-valeht cobalt extracted from soils with EDTA·2HOAc·NH4OAc solution (pH 4.65) was developed based on the difference of the stability constants of Co(II)EDTA and Co(III)EDTA. Analytical results indicated that soil cobalt existed in both two oxidation states, i. e. , di-and tri-valent cobalt. Extractable di-valent cobalt in 60 soil samples collected from various soils in China ranged from 0.02 ppm to 3.54 ppm, with the mean of 0.62 ppm, and extractable tri-valent cobalt from 0.04 ppm to 27.65 ppm, with the mean of 2.93 ppm. |
| Key Words: |
| Citation: Cai, Z. C. and Liu, Z. 1991. Studies on Oxidation States of Cobalt Extracted from Soils with EDTA·HO Ac·NH4OAc. Pedosphere. 1(2): 109-116. |
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