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|The River Vormbäcken is the recipient of treated AMD from the Kristineberg mine site, northern Sweden, where mining of a complex sulfidic ore has taken place since 1940. Parts of the river flow through different kinds of wetlands. The changes in metal concentrations and water chemistry that occur upon passing these wetlands have been studied by analysis of water chemistry data from a number of stations along the river collected during 11 years of monthly sampling. It is concluded that the impact and functioning of wetlands cannot be elucidated from chemistry data alone. Future studies including e.g. reconstructed water flow are needed.|