Alteration of arsenopyrite in soils under different vegetation covers
Jazyk angličtina Země Nizozemsko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
20035968
DOI
10.1016/j.scitotenv.2009.12.003
PII: S0048-9697(09)01180-2
Knihovny.cz E-zdroje
- MeSH
- arsenikové přípravky analýza MeSH
- difrakce rentgenového záření MeSH
- kinetika MeSH
- látky znečišťující půdu analýza MeSH
- mikroskopie elektronová rastrovací MeSH
- minerály MeSH
- monitorování životního prostředí MeSH
- počasí MeSH
- půda analýza MeSH
- sloučeniny železa analýza MeSH
- stromy růst a vývoj MeSH
- sulfidy analýza MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- arsenikové přípravky MeSH
- arsenopyrite MeSH Prohlížeč
- látky znečišťující půdu MeSH
- minerály MeSH
- půda MeSH
- sloučeniny železa MeSH
- sulfidy MeSH
The weathering of arsenopyrite (FeAsS) has been monitored in soils using an in situ experimental approach. Arsenopyrite in nylon experimental bags was placed in individual horizons in soils in spruce (litter, horizons A, B, and C), beech (litter, horizons A, B, and C) and unforested (horizons A, B, and C) areas and left in contact with the soil for a period of 1 year. The individual areas on the ridge of the Krusné hory Mts., Czech Republic, had the same lithology, climatic and environmental conditions. Scorodite (FeAsO(4).2H(2)O) was identified as a principal secondary mineral of arsenic (As) formed directly on the surface of the arsenopyrite. Scorodite was formed in all the areas in all soil horizons. The amount of scorodite formed decreased in the series beech, spruce and unforested areas. In forested areas, there was a larger amount of scorodite on arsenopyrites exposed in organic horizons (litter, A horizon). The greater rate of arsenopyrite alteration in organic horizons in the beech stand compared to spruce stand is probably a result of faster mineralization of organic material with resulting production of nitrate and better seepage conditions of soil in this area. Speciation of As determined using the sequential extraction technique demonstrated that As was bonded in the soils primarily in the residual fractions prior to the experiment. The As content in the mobile fractions increased in the organic horizon in the forested areas after the experiments.
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