Journal
ENVIRONMENTAL POLLUTION
Volume 219, Issue -, Pages 588-595Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.06.019
Keywords
Sulfur; Iron; Phosphorus; Sediment; DGT
Categories
Funding
- National Natural Science Foundation of China [41373100]
- Science and Technology Program for Public Wellbeing of Shandong Province [2013kjhm060308]
- CAS Key Technology Talent Program
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The cycling of sulfur (S), iron (Fe) and phosphorus (P) in sediments and pore water can impact the water quality of overlying water. In a heavily polluted river estuary (Yantai, China), vertical profiles of fluxes of dissolved sulfide, Fe2+ and dissolved reactive phosphorus (DRP) in sediment pore water were investigated by the Diffusive Gradients in Thin films technique (DGT). Vertical fluxes of S, Fe, P in intertidal sediment showed the availability of DRP increased while the sulfide decreased with depth in surface sediment, indicating that sulfide accumulation could enhance P release in anoxic sediment. In sites with contrasting salinity, the relative dominance of iron and sulfate reduction was different, with iron reduction dominant over sulfate reduction in the upper sediment at an intertidal site but the reverse true in a freshwater site, with the other process dominating at depth in each case. Phosphate release was largely controlled by iron reduction. (C) 2016 Elsevier Ltd. All rights reserved.
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