Ore-bearing rocks and natural waters of the Pitkäranta ore district (near the “Arsenic” shaft, the Hopunvaara mine field) were sampled and analyzed. The permanganate value as well as iron and manganese contents in surface water are higher than MPC values, while water samples from the “Arsenic” shaft have the elevated contents of zinc, copper, and arsenic. The Fe, Mn, Cu, Zn, Cr, As, and Ni speciation in waters have been determined by thermodynamic calculations, taking into account the possibility of the formation of metal complexes with humic and fulvic acids. The fulvic acid is almost completely consumed for the formation of the complex Fe(OH)2Fu-. Ni, Cd, Co occur mainly in the ionic form, and the fraction of Mn and Zn in the ionic form is also significant.

中文翻译：

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“砷”井区（南卡累利阿Pitkäranta 矿区）重金属迁移形式和地表水化学成分

对 Pitkäranta 矿区（“砷”竖井附近，Hopunvaara 矿区）的含矿岩石和天然水进行采样和分析。地表水中的高锰酸盐值以及铁和锰含量高于 MPC 值，而“砷”井水样中锌、铜和砷的含量较高。水中的 Fe、Mn、Cu、Zn、Cr、As 和 Ni 形态已通过热力学计算确定，同时考虑到与腐殖酸和富里酸形成金属络合物的可能性。富里酸几乎完全消耗以形成复合物 Fe(OH)2Fu-。Ni、Cd、Co 主要以离子形式存在，Mn 和 Zn 以离子形式存在的比例也很大。