Retention capacities of several bryophytes for Hg(II) with special reference to the elevation and morphology of moss growth |
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Authors: | Shou-Qin Sun Ding-Yong Wang Ming He Xian-Yuan Li Cheng Zhang |
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Institution: | (1) Department of Resources and Environmental Sciences, Shanghai Jiaotong University, Shanghai, 201101, China;(2) College of Resources and Environmental Sciences, Southwest University, Chongqing, 400716, China;(3) College of Horticulture and Gardens, Southwest University, Chongqing, 400716, China |
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Abstract: | Hg(II) Retention capacities of nine bryophyte species, collected from Jinfo Mountains (JFM) in Chongqing, China, had been
investigated with special reference to the effect of morphology and elevation of moss growth. Results indicated that adsorption
capacities of bryophytes for Hg(II) became stronger with the increase of multi-branches and leafy-shoots, as well as the elevation
of moss growth, which was observed both in adsorption isotherm and adsorption kinetics experiments. Contrarily, the desorption
kinetics showed a decrease tendency with the increase of multi-branches and leafy-shoots and the elevation of moss growth.
The results demonstrated that bryophytes with higher multi-branches and leafy-shoots and higher growth elevation had a stronger
adsorption capacity and a weaker desorption tendency, and therefore had a stronger retention capacity to Hg(II). The results
disclosed the different relative sensitivity and retention capacity of mosses to pollution resulting from heavy metals, due
to the differences in growth elevation and morphology. These should be considered when bryophytes were chosen as a tool for
biomonitoring materials to environmental pollution, especially caused by Hg(II). |
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Keywords: | Bryophytes Adsorption Desorption Morphology Elevation Mercury |
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