Pedosphere 7(3): 231--235, 1997
ISSN 1002-0160/CN 32-1315/P
©1997 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of anions on toxicity of cadmium applied to microbial biomass in red soil
K. S. KHAN, XIE Zheng-Miao and HUANG Chang-Yong
College of Natural Resources and Environmental Sciences, Zhejiang Agricultural University, Hanyzhou 310029 (China)
ABSTRACT
      A laboratory incubation experiment was conducted to elucidate the effects of associated anions on toxicity of cadmium applied to microbial biomass in the red soil. Cadmium was applied at six different levels,i. e., 0 (background), 5, 15, 30, 60 and 100 μg g-1 soil in the form of either cadmium acetate or cadmium chloride. Application of cadmium as cadmium acetate markedly reduced the soil microbial biomass carbon compared to cadmium applied as cadmium chloride at all the tested levels. Similarly, organic carbon to biomass carbon ratio in the soil was markedly increased by increasing the level of the cadmium in the soil as cadmium acetate, while the change was much smaller in the case of cadmium chloride at the same cadmium levels. The results suggested that due consideration should be given to the source of cadmium while deciding the cadmium levels in experiments.
Key Words:  anions, cadmium toxicity, microbial biomass, red soil
Citation: Khan, K. S., Xie, Z. M. and Huang, C. Y. 1997. Effect of anions on toxicity of cadmium applied to microbial biomass in red soil. Pedosphere. 7(3): 231-235.
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