title: Dynamic characteristics of sulfur, iron and phosphorus in coastal polluted sediments, north China.
abstract: 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.
authors.affiliation: Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
authors.forename: Qiyao
authors.initials: Q
authors.lastname: Sun
authors.affiliation: Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China. Electronic address: yqsheng@yic.ac.cn.
authors.forename: Yanqing
authors.initials: Y
authors.lastname: Sheng
authors.affiliation: Research Center for Coastal Environment Engineering Technology of Shandong Province, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Brackenhurst Campus, Southwell, Nottinghamshire, NG250QF, UK.
authors.forename: Marcello
authors.initials: M
authors.lastname: Di Bonito
authors.affiliation: School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Brackenhurst Campus, Southwell, Nottinghamshire, NG250QF, UK.
authors.forename: Robert J G
authors.initials: RJG
authors.lastname: Mortimer
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000032:analysis*; D010084:Oxidation-Reduction; D010758:Phosphorus / Q000032:analysis*; D045483:Rivers / Q000737:chemistry; D013440:Sulfides / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D013440:Sulfides; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D007501:Iron
keywords: DGT; Iron; Phosphorus; Sediment; Sulfur