Trace metal elements (TME) can be real threats for living organisms. However, few studies dealt with TME in reservoirs in rural areas where farming practises could induce negative effects. Mae Thang reservoir (northern Thailand) has been studied for 3 years to understand the seasonal behaviour of dissolved TME: Fe, Mn, Cd, Al, Pb, V, Cr, Co, Ni, Cu, Zn, Mo, U and As and associated physicochemical parameters. In situ measurements of these parameters were done during the dry and the wet seasons as well as water samples along the water column for further analyses and TME determination by inductively coupled plasma-mass spectrometry (ICP-MS). In the dry season, the water column was characterized by a strong stratification and anoxic conditions in the hypolimnion. High rain and water input from the watershed during the wet season induced mixing of the water. All TME, except Ni, Co and Cr were less concentrated in the wet season indicating a dilution effect by water input. There was thus no important dissolved pollution coming from the watershed. The anoxic conditions in the dry season enhanced the reduction of Fe and Mn and the desorption processes. Depth, and thus oxic-anoxic conditions were the main drivers of TME in the dry season, while in the wet season, dissolution processes from parent rocks of watershed were favoured. The average concentrations of TME in the reservoir were in the limit of the international and Thai standards. Only localized values in the bottom of the reservoir for Fe and Mn were higher than the limits.

译文

微量金属元素 (TME) 可能是活生物体的真正威胁。然而,很少有研究涉及农村地区水库中的TME,在这些地区,农业实践可能会产生负面影响。对Mae Thang水库 (泰国北部) 进行了3年的研究,以了解溶解的TME的季节性行为: Fe,Mn,Cd,Al,Pb,V,Cr,Co,Ni,Cu,Zn,Mo,U和As以及相关的理化参数。在干燥和潮湿季节以及沿水柱的水样中对这些参数进行了原位测量,以进一步分析和通过电感耦合等离子体质谱法 (icp-ms) 测定TME。在干旱季节,水柱的特征是hypolimnion中的强分层和缺氧条件。在雨季期间,流域的高雨水和水输入会引起水的混合。除Ni,Co和Cr外,所有TME在雨季的浓度均较低,表明水分输入具有稀释作用。因此,流域没有重要的溶解污染。干旱季节的缺氧条件增强了Fe和Mn的还原和解吸过程。在干旱季节,深度和缺氧条件是TME的主要驱动力,而在雨季,则有利于流域母岩的溶解过程。水库中TME的平均浓度在国际和泰国标准的限制内。仅储层底部的Fe和Mn局部值高于极限值。

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