Heavy metal retention in secondary precipitates from a mine rock dump and underlying soil, Dalarna, Sweden |
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| Authors: | Zhixun Lin Roger B Herbert Jr |
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| Institution: | Environmental Geology, Institute of Earth Sciences, Uppsala University, Norbyv?gen 18 B, S-752 36 Uppsala, Sweden, SE
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| Abstract: | This study investigates the retention of heavy metals in secondary precipitates from a sulfidic mine rock dump and underlying
podzolic soils by means of mineralogical and chemical extraction methods. The rock dump, which is at least 50 years old, consists
of a 5–10-cm-thick leached zone and an underlying 110–115-cm-thick accumulation zone. Optical microscopy and electron microprobe
analyses confirm that pyrrhotite weathering has proceeded much further in the leached horizon relative to the accumulation
horizon. The weathering of sulfides in the leached zone has resulted in the migration of most heavy metals to the accumulation
zone or underlying soils, where they are retained in more stable phases such as secondary ferric minerals, including goethite
and jarosite. Some metals are temporarily retained in hydrated ferrous sulfates (e.g., melanterite, rozenite).
Received: 28 October 1996 · Accepted: 24 February 1997 |
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| Keywords: | Acid mine drainage Sulfide oxidation Goethite Jarosite Heavy metals Hydrated ferrous sulfates |
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