The effects of soil properties and temperature on the adsorption isotherms of lead on some temperate and semiarid surface soils of Iran |
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Authors: | Ali Akbar Safari Sinegani Hossein Mirahamdi Araki |
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Institution: | (1) Bu-Ali Sina University, Hamadan, Iran |
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Abstract: | Sorption of metal ions by soil and clay minerals is a complex process involving different mechanisms, and controlled by different
variables that can interact. The aim of this work was to study the retention mechanisms of Pb ions on different soil samples.
Surface soils were sampled from Guilan and Hamadan provinces in north and northwest of Iran with temperate and semiarid climates.
The adsorption isotherms of Pb on the soils have been studied at 15, 27 and 37°C. The adsorption data for different soils
were fitted into Langmuir and Freundlich models. Temperate soil samples had higher clay content, cation exchange capacity,
dichromate (oxidable) organic carbon, total Kjeldahl-nitrogen, biological activity, amorphous and crystalline Fe and Al, but
semiarid soil samples had higher sand content, pH, equivalent calcium carbonate, available P and K. Lead adsorption data obtained
from semiarid soils against those obtained from temperate soils were better fitted in both Langmuir and Freundlich models.
Langmuir constants Q
0 for Pb adsorption in semiarid soils were considerably lower than those for Pb adsorption in temperate soils. However, the
binding energy (K
L) of Pb and Freundlich constant n were higher for data of semiarid soils. The effect of temperature on the Pb adsorption was positive especially in temperate
soils; however, soil properties had higher effects on Pb adsorption. |
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