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Adsorption and Desorption of Mercury by Bangpakong River Sediments as Influenced by Salinities

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dc.contributor.author Waewtaa Thongra-ar
dc.contributor.author Preeda Parkpoin
dc.contributor.author Ronald D. DeLaune
dc.contributor.author Aroon Jugsujinda
dc.contributor.other Institute of Marine Science en
dc.date.accessioned 2019-03-25T09:14:48Z
dc.date.available 2019-03-25T09:14:48Z
dc.date.issued 2001
dc.identifier.uri http://dspace.lib.buu.ac.th/xmlui/handle/1234567890/2381
dc.description.abstract Mercury adsorption and desorption by Bangpakong River sediments (pH range 6.8-7.8) of Thailand were investigated at salinity levels of 0, 5, 15 and 30@1000 using a batch equilibration techniques. Using Freundlich isotherm adsorption and desorption data collected represented a nonlinear form. A significant portion (90-99%) of added Hg (2-10 mg L-1) was sorbed by the sediment. Mercury adsorption isotherms or percentage adsorbed were similar among the four salinities tested. In the absence of salinity, Hg adsorption was highly influenced by pH. Whereas in the presence of salinity gradients, Hg(II)-organic complexes predominated over Hg(II)-Cl complexes, neutralizing effect of chloride concentrations and pH on the adsorption phenomena. Organic matter and clay contents of sediment were responsible for the Hg adsorption. Fe and Mn oxides showed negative correlation with the Hg adsorption capacity (r = -0.549 and -0.594 respectively). Increase in Hg desorbed from the sediments occurred only at the 30@1000 salinity level. The Hg adsorption-desorption characteristics of the sediments studied exhibited a very strong irreversible sorption of added inorganic Hg. River sediment such as sediment as shown in this study with significant levels of organic matter and clay have the potential to retain Hg making it less bioavailable and mobile thus reducing potential toxicity to aquatic organisms in the environment. th_TH
dc.language.iso eng th_TH
dc.subject Adsorption th_TH
dc.subject Desorption th_TH
dc.subject Freundlich isotherm th_TH
dc.subject Mercury th_TH
dc.subject River sediment th_TH
dc.subject Salinity th_TH
dc.subject Salt water intrusion th_TH
dc.title Adsorption and Desorption of Mercury by Bangpakong River Sediments as Influenced by Salinities en
dc.type บทความวารสาร th_TH
dc.issue 5
dc.volume 36
dc.year 2001
dc.journal Journal of Environmental Science and Health, Part A: Toxic/Hazardous Substances and Environmental Engineering.
dc.page 623-640.

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