Abstract
Several levels of cadmium (Cd), zinc (Zn), nickel (Ni), or cobalt (Co) were
added to samples of a soil as solutions of nitrate salts. The samples were
incubated at about field capacity for up to 30 days at differing temperatures
and the concentration of the metal ions in the soil solution was estimated at
4 times for each temperature. The effects of level of addition, time, and
temperature on solution concentration were well described using a mechanistic
model. The model suggests that the metals react with a differing range of soil
components and that the pathways for diffusion into the particles also differ.
The change in solution concentration was slowest for Cd and fastest for Co and
Ni but these were not significantly faster than Zn. These results suggest that
the toxic effects of Cd added to soils will not decrease greatly with time
whereas the effectiveness of fertilisers (Zn and Co), and potential
fertilisers (Ni), will decrease.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
50 articles.
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