Geochemical environments at the water-sediment interface in aquaculture ponds showing metal accumulation on shrimp gills

the gill is the organ by which many toxic metals are taken up by crustaceans. fe2+ is known to precipitate at its surface, a phenomenon recently observed in some tropical aquaculture ponds. the present study uses a field approach to understand better the environmental conditions and ecological processes involved in this deposit. because shrimp are exposed to reduced products originating from organic waste accumulated in the sediment, spatial variation in ph, redox potential and concentrations of dissolved metals in pore water were investigated in these ponds. total organic carbon, acid volatile sulfide and pyrite were also analyzed in the solid phase.

鳃是甲壳类生物吸收多种有毒金属的器官。已知二价铁离子可在其表面发生沉淀，此现象最近在部分热带水产养殖池塘中被观察到。本研究采用实地调查方法，旨在深入理解导致此类沉积物形成的生态环境条件和生态过程。鉴于虾类暴露于有机废物在沉积物中积累而产生的还原产物，对池塘中pH值、氧化还原电位以及孔隙水中溶解金属浓度等空间变化进行了探究。同时，对固态相中的总有机碳、酸溶性硫化物和黄铁矿也进行了分析。