کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5748969 1619148 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Trace metal behavior in sediments of Jiulong River Estuary and implication for benthic exchange fluxes
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Trace metal behavior in sediments of Jiulong River Estuary and implication for benthic exchange fluxes
چکیده انگلیسی


- Distinct spatial and temporal variations of sediment metals due to effluent discharge and biological activities.
- Precipitation as sulfides and adsorption onto Mn/Fe (hydr)oxides were important in scavenging trace metals.
- Overlying water was a major source for trace metals in sediments.
- Sediments could be the source for metals if surface remobilization (Mn/Fe reduction) dominated.
- Impacts of both natural and anthropogenic processes on the source and fate of metals.

Severe metal pollution due to industrial effluents releases has been documented in Jiulong River estuary, Southern China. However, integrated understanding of trace metal behavior in the sediment is lacking. In the present study, DGT (diffusive gradients in thin films) technique was employed together with sediment cores to study the porewater dynamics of trace metals as well as the benthic exchange fluxes from four sampling sites over three different months. The sedimentary environment showed distinct spatial and temporal variations due to effluent discharge and biological activities. Metal behavior was controlled by early diagenetic reactions below the interface, in suboxic layer and in deeper sediment. Precipitation as sulfides and adsorption onto Mn/Fe (hydr)oxides were important in scavenging trace metals. Estimated exchange fluxes at sediment-water interface in this estuary indicated that the overlying water was a major source for trace metals, whereas sediments could also be the source if surface remobilization (Mn/Fe reduction) dominated. Our results highlighted the impacts of both natural and anthropogenic processes on the source, fate and transformation of trace metals in this dynamic system.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 225, June 2017, Pages 598-609
نویسندگان
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