Influence of small-scale gold mining and toxic element concentrations in Bonsa river, Ghana: a potential risk to water quality and public health von Affum, Andrews Obeng, Dede, Shiloh Osae, Nyarko, Benjamin Jabes Botwe, Acquaah, Samuel Osafo, Kwaansa-Ansah, Edward Ebow, Darko, Godfred, Dickson, Adomako, Affum, Enoch Acheampong, Fianko, Joseph Richmond

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