Abstract：
The estuary of Huelva is constituted by the common mouth of the Odiel and Tinto rivers, which are extreme cases of acid mine drainage contamination due to the Iberian Pyrite Belt, the world\'s largest sulfide mineral province. The drained acidic waters are subjected to seawater mixing and thus, to dilution and precipitation processes that drive the load of contaminants entering the oceanic environment. This research reports the distribution of major metal(loid)s present in the highly acidic waters across the entire Tinto and Odiel estuarine systems as they are subjected to acid mine drainage neutralization, until reaching the ocean. The datasets presented are divided in low- and high-flow periods, corresponding to dry/warm and wet/cold seasons, respectively. Iron and Al were almost entirely removed from solution with pH increase at both periods due to their precipitation as schwertmannite and basaluminite, respectively. These mineral phases also, controlled the behavior of As, Cu and Pb, which were removed from solution, with >90 % of their concentration ending up in the particulate phase due to sorption processes. However, at pH >7, As returned entirely to the dissolved phase at both sampled seasons because of desorption, similarly to Cu at the low-flow period. On the other hand, concentrations of Zn, Cd, Mn, Co and Ni in solution decreased only by dilution with seawater, with null partitioning to any sorption processes during estuarine mixing until reaching the Atlantic Ocean.
摘要：
韦尔瓦河口由奥迪尔河和丁托河的共同河口组成，这是由于伊比利亚黄铁矿带造成的酸性矿山排水污染的极端情况，世界上最大的硫化物矿物省。排出的酸性水经过海水混合,稀释和沉淀过程驱使污染物进入海洋环境。这项研究报告了在整个Tinto和Odiel河口系统中，高酸性水域中存在的主要金属（类）的分布，直到到达大海。所提供的数据集分为低流量时期和高流量时期，对应于干燥/温暖和潮湿/寒冷的季节，分别。铁和铝几乎完全从溶液中去除，pH在两个时期都随着pH值的增加而增加，这是由于它们沉淀为schwertmannite和碱铝石，分别。这些矿物相也是，控制了As的行为，Cu和Pb,从溶液中移除，由于吸附过程，它们的浓度>90％最终处于颗粒相。然而,在pH>7时，由于解吸，在两个采样季节都完全返回到溶解相，与低流量时期的Cu相似。另一方面,锌的浓度，Cd,Mn,溶液中的Co和Ni仅通过用海水稀释而减少，在河口混合直至到达大西洋之前，对任何吸附过程进行零分配。
