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Sulfur, iron, and phosphorus geochemistry in an intertidal mudflat impacted by shellfish aquaculture.
Environ Sci Pollut Res Int. 2019 Mar; 26(7):6460-6471.ES

Abstract

Dissolved sulfide, iron (Fe), and phosphorus (P) in a mudflat (Jiaozhou Bay, China) impacted by shellfish aquaculture were measured in situ by the diffusive gradients in thin films (DGT) technique. A combination of porewater and solid-phase chemistry was used to characterize the interplays of Fe and S, and their control on P mobilization. Below the subsurface layer, two times higher fluxes (FDGT) of dissolved Fe2+ from porewater to the DGT device than those of dissolved sulfide indicate that dissimilatory iron reduction (DIR) dominates over sulfate reduction (SR). Spatial coupling of dissolved Fe2+ and P points to P release driven mainly by reductive dissolution of Fe. Much higher FDGT values of dissolved Fe2+ relative to dissolved P imply that oxidative regeneration of Fe oxides at the sediment-water interfaces (SWIs) of the transitional mudflat serves as an effective "iron curtain" of upward diffusing P. In the mudflat sediments of DIR prevalence, the accumulation of total reduced inorganic sulfur (TRIS) is dampened, which can largely ascribed to enhanced oxidative loss of sulfide and/or limited availability of degradable organic carbon in the dynamic regimes. Low dissolved sulfide concentrations in the sediments leave the majority of reactive Fe unsulfidized and thus abundantly available to buffer newly produced sulfide.

Authors+Show Affiliations

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China. zhumaoxu@ouc.edu.cn.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30623326

Citation

Meng, Tao, et al. "Sulfur, Iron, and Phosphorus Geochemistry in an Intertidal Mudflat Impacted By Shellfish Aquaculture." Environmental Science and Pollution Research International, vol. 26, no. 7, 2019, pp. 6460-6471.
Meng T, Zhu MX, Ma WW, et al. Sulfur, iron, and phosphorus geochemistry in an intertidal mudflat impacted by shellfish aquaculture. Environ Sci Pollut Res Int. 2019;26(7):6460-6471.
Meng, T., Zhu, M. X., Ma, W. W., & Gan, Z. X. (2019). Sulfur, iron, and phosphorus geochemistry in an intertidal mudflat impacted by shellfish aquaculture. Environmental Science and Pollution Research International, 26(7), 6460-6471. https://doi.org/10.1007/s11356-018-04114-w
Meng T, et al. Sulfur, Iron, and Phosphorus Geochemistry in an Intertidal Mudflat Impacted By Shellfish Aquaculture. Environ Sci Pollut Res Int. 2019;26(7):6460-6471. PubMed PMID: 30623326.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sulfur, iron, and phosphorus geochemistry in an intertidal mudflat impacted by shellfish aquaculture. AU - Meng,Tao, AU - Zhu,Mao-Xu, AU - Ma,Wei-Wei, AU - Gan,Zai-Xin, Y1 - 2019/01/08/ PY - 2018/10/02/received PY - 2018/12/27/accepted PY - 2019/1/10/pubmed PY - 2019/4/26/medline PY - 2019/1/10/entrez KW - Biogeochemical cycling KW - Buffering capacity KW - DGT technique KW - Iron reduction KW - Phosphorus mobilization KW - Sulfide toxicity SP - 6460 EP - 6471 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 26 IS - 7 N2 - Dissolved sulfide, iron (Fe), and phosphorus (P) in a mudflat (Jiaozhou Bay, China) impacted by shellfish aquaculture were measured in situ by the diffusive gradients in thin films (DGT) technique. A combination of porewater and solid-phase chemistry was used to characterize the interplays of Fe and S, and their control on P mobilization. Below the subsurface layer, two times higher fluxes (FDGT) of dissolved Fe2+ from porewater to the DGT device than those of dissolved sulfide indicate that dissimilatory iron reduction (DIR) dominates over sulfate reduction (SR). Spatial coupling of dissolved Fe2+ and P points to P release driven mainly by reductive dissolution of Fe. Much higher FDGT values of dissolved Fe2+ relative to dissolved P imply that oxidative regeneration of Fe oxides at the sediment-water interfaces (SWIs) of the transitional mudflat serves as an effective "iron curtain" of upward diffusing P. In the mudflat sediments of DIR prevalence, the accumulation of total reduced inorganic sulfur (TRIS) is dampened, which can largely ascribed to enhanced oxidative loss of sulfide and/or limited availability of degradable organic carbon in the dynamic regimes. Low dissolved sulfide concentrations in the sediments leave the majority of reactive Fe unsulfidized and thus abundantly available to buffer newly produced sulfide. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/30623326/Sulfur_iron_and_phosphorus_geochemistry_in_an_intertidal_mudflat_impacted_by_shellfish_aquaculture_ L2 - https://dx.doi.org/10.1007/s11356-018-04114-w DB - PRIME DP - Unbound Medicine ER -