Pedosphere 8(4): 355--360, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of phosphate on zinc transport in lou soil
LÜ Jia-Long, DONG Ling-Xiao, ZHANG Yi-Ping, ZHANG Fu-Cang and PAN Zhi
Department of Resources and Environmental Sciences, Northwestern Agricultural University, Yangling, Shaanxi 712100 (China)
      A study on the transport characteristics of zinc in lou soil with phosphate at different concentrations was carried out by the method of step input. The effects of phosphate and temperature on zinc transport were studied through analysing the diffusion-dispersion coefficients (D) and the retardation factor (R) obtained by the program CXTFIT. The results showed that D decreased and R increased with increasing concentration of phosphate so that it was difficult for zinc to break through the soil column, and zinc stopped to break through the column at high temperature. One order equation, double constant equation and the Elovich equation were all suitable for the description of zinc dynamics. Effects of phosphate and temperature on zinc transport were further confirmed by the analysis on pseudo-thermodynamic parameters of zinc transport.
Key Words:  diffusion-dispersion coefficient, phosphate, pseudo-thermodynamic parameters, retardation factor, zinc transport kinetics
Citation: LÜ Jia-Long, Dong, L. X., Zhang, Y. P., Zhang, F. C. and Pan, Z. 1998. Effect of phosphate on zinc transport in lou soil. Pedosphere. 8(4): 355-360.
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