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- W2108966486 abstract "The purpose of the study was to examine the influence of inorganic N (NH 4 + , NO 3 - ) and phosphate on the biological oxidation of a sulfidic black-schist ore which contained pyrrhotite as the main iron sulfide. Iron was initially solubilized as Fe 2+ from the ore and subsequently oxidized to Fe 3+ in shake flask experiments. Under these experimental conditions, iron dissolution from pyrrhotite was mainly a chemical reaction, with some enhancement by bacteria, whereas the subsequent Fe 2+ oxidation was bacterially mediated, with negligible contribution from chemical oxidation. Phosphate amendment did not enhance Fe 2+ oxidation. Chemical analysis of leach solutions with no exogenous phosphate revealed that phosphate was solubilized from the black-schist ore. Ammonium amendment (6 mM) enhanced Fe 2+ oxidation, whereas the addition of nitrate (6 and 12 mM) had a negative effect. An increase in the temperature from 30 to 35°C slightly enhanced Fe 2+ oxidation, but the effect was statistically not significant. The precipitation of potassium jarosite was indicative of Fe 2+ oxidation and was absent in nitrate-inhibited cultures because of the lack of Fe 2+ oxidation. The black-schist ore also contained phlogopite, which was altered to vermiculite in iron-oxidizing cultures." @default.
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- W2108966486 date "1994-04-01" @default.
- W2108966486 modified "2023-09-23" @default.
- W2108966486 title "Nutrient Effect on the Biological Leaching of a Black-Schist Ore" @default.
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- W2108966486 doi "https://doi.org/10.1128/aem.60.4.1287-1291.1994" @default.
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