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The role of heterotrophic bacteria in feldspar dissolution: an experimental approach

Hutchens, Elena and Valsami-Jones, Eugenia and McEldowney, Sharron and Gaze, W. and McLean, J. (2003) The role of heterotrophic bacteria in feldspar dissolution: an experimental approach. Mineralogical Magazine, 67 (6). pp. 1157-1170. ISSN 0026-461X

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Official URL: http://dx.doi.org/10.1180/0026461036760155

Abstract

This paper presents the results of a laboratory study on the influence of heterotrophic bacteria on dissolution of a silicate mineral (K-feldspar) under a variety of growth conditions. Twenty seven strains of heterotrophic bacteria were isolated from a feldspar-rich soil (Shap, NW England). Liquid and solid minimal aerobic media (C/N-sufficient, K-limited, Fe-limited, N-limited and glucose/NH4Cl only) at 26ºC were used for isolation of the bacteria. The media selected bacterial isolates that were fastgrowing aerobic heterotrophs able to use glucose as the sole source of carbon and energy. The extent of mineral dissolution (in the presence of the isolates) was assessed after 48 h of incubation by measuring the release of Al from the K-feldspar by ICP-AES. More detailed dissolution experiments were carried out with one of the strains, Serratia marcescens, an isolate that was very effective in enhancing feldspar dissolution. The main conclusions of this study are: (1) the degree of enhancement of K-feldspar dissolution varied with bacterial isolate and growth conditions; (2) enhancement of dissolution began during stationary phase growth; (3) the production of chelating compounds (exopolymers, siderophores, pigments) during the stationary phase might be a possible mechanism for bacterially enhanced K-feldspar dissolution; (4) the frequent sub-culturing of isolates can have a significant effect on their physiological characteristics and may possibly influence their capacity to enhance mineral dissolution.

Item Type:Article
Additional Information:Online ISSN 1471-8022
Uncontrolled Keywords:K-feldspar, dissolution, heterotrophic bacteria, serratia marcescens
Research Community:University of Westminster > Life Sciences, School of
ID Code:318
Deposited On:01 Dec 2005
Last Modified:07 Apr 2008 14:23

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