Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV

Abstract Pyrite oxidation by mixed mesophilic acidophiles was conducted under conditions of controlled and non-controlled redox potential to investigate the role of sessile microbes in pyrite oxidation. Microbes attached on pyrite surfaces by extracellular polymeric substances (EPS), and their high...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Chang Liu, Yan Jia, Heyun Sun, Qiaoyi Tan, Xiaopeng Niu, Xuekun Leng, Renman Ruan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/15ff0616b7c543458a636c7328c7550b
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:15ff0616b7c543458a636c7328c7550b
record_format	dspace
spelling	oai:doaj.org-article:15ff0616b7c543458a636c7328c7550b2021-12-02T11:52:59ZLimited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV10.1038/s41598-017-04420-22045-2322https://doaj.org/article/15ff0616b7c543458a636c7328c7550b2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04420-2https://doaj.org/toc/2045-2322Abstract Pyrite oxidation by mixed mesophilic acidophiles was conducted under conditions of controlled and non-controlled redox potential to investigate the role of sessile microbes in pyrite oxidation. Microbes attached on pyrite surfaces by extracellular polymeric substances (EPS), and their high coverage rate was characterized by scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). The dissolution of pyrite was negligible if the redox potential was controlled below 650 mV (near the rest potential of pyrite), even though the bacteria were highly active and a high coverage rate was observed on pyrite surfaces. However, with un-controlled redox potential the rate of pyrite oxidation increased greatly with an increasing redox potential. This study demonstrates that sessile microbes play a limited role in pyrite oxidation at a redox potential below 650 mV, and highlight the importance of solution redox potential for pyrite oxidation. This has implications for acid mine drainage control and pyrite oxidation control in biometallurgy practice.Chang LiuYan JiaHeyun SunQiaoyi TanXiaopeng NiuXuekun LengRenman RuanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chang Liu Yan Jia Heyun Sun Qiaoyi Tan Xiaopeng Niu Xuekun Leng Renman Ruan Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV
description	Abstract Pyrite oxidation by mixed mesophilic acidophiles was conducted under conditions of controlled and non-controlled redox potential to investigate the role of sessile microbes in pyrite oxidation. Microbes attached on pyrite surfaces by extracellular polymeric substances (EPS), and their high coverage rate was characterized by scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM). The dissolution of pyrite was negligible if the redox potential was controlled below 650 mV (near the rest potential of pyrite), even though the bacteria were highly active and a high coverage rate was observed on pyrite surfaces. However, with un-controlled redox potential the rate of pyrite oxidation increased greatly with an increasing redox potential. This study demonstrates that sessile microbes play a limited role in pyrite oxidation at a redox potential below 650 mV, and highlight the importance of solution redox potential for pyrite oxidation. This has implications for acid mine drainage control and pyrite oxidation control in biometallurgy practice.
format	article
author	Chang Liu Yan Jia Heyun Sun Qiaoyi Tan Xiaopeng Niu Xuekun Leng Renman Ruan
author_facet	Chang Liu Yan Jia Heyun Sun Qiaoyi Tan Xiaopeng Niu Xuekun Leng Renman Ruan
author_sort	Chang Liu
title	Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV
title_short	Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV
title_full	Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV
title_fullStr	Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV
title_full_unstemmed	Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV
title_sort	limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mv
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/15ff0616b7c543458a636c7328c7550b
work_keys_str_mv	AT changliu limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv AT yanjia limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv AT heyunsun limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv AT qiaoyitan limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv AT xiaopengniu limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv AT xuekunleng limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv AT renmanruan limitedroleofsessileacidophilesinpyriteoxidationbelowredoxpotentialof650mv
_version_	1718394909028777984

Limited role of sessile acidophiles in pyrite oxidation below redox potential of 650 mV

Ejemplares similares