Effects of pH and salinity on adsorption of hypersaline photosynthetic microbial mat exopolymers to goethite

A study using a quartz crystal microbalance and fluorescence spectroscopy

Lei Li, Wenjuan Song, Chunnuan Deng, Daoyong Zhang, Fahad A. Al-Misned, M. Golam Mortuza, Geoffrey Michael Gadd, Xiangliang Pan (Lead / Corresponding author)

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Salinity and pH are two water chemical factors that vary drastically—seasonally or daily—in a variety of aquatic environments. Drastic change of salinity and pH may have a significant impact on adsorption of microbial extracellular polymers (EPS) to sediment minerals and thus influence many other important elemental geochemical processes. However, how salinity and pH changes affect EPS adsorption to minerals is poorly known. In the present study, adsorption of EPS from a hypersaline microbial mat to goethite at different pH values (4, 7 and 10) and salinity (0.15‰, 35‰ and 70‰) was monitored online using a quartz crystal microbalance (QCM) with EEM fluorescence spectroscopy as a complementary method. The adsorption kinetics were well described by an exponential function. The adsorption capacity of EPS to goethite significantly increased as the pH and salinity increased. The pH and salinity dependence of EPS adsorption to goethite is of great importance for understanding the environmental geochemistry of heavy metals in aquatic environments. In inland lakes and estuary zones, the seasonal or daily pulse of hydrological events will drastically alter water salinity and pH and consequently exert significant influences on the mobility, chemical species and ecotoxicity of heavy metals through the EPS pathway. It is necessary to systematically investigate the geochemical behavior of EPS in such dynamic aquatic environments and their potential effects on other geochemical processes.

Original languageEnglish
Pages (from-to)332-337
Number of pages6
JournalGeomicrobiology Journal
Volume33
Issue number3-4
Early online date25 Feb 2016
DOIs
Publication statusPublished - 15 Mar 2016

Fingerprint

Quartz Crystal Microbalance Techniques
exopolymer
microbial mat
fluorescence spectroscopy
Quartz crystal microbalances
Fluorescence Spectrometry
Salinity
Fluorescence spectroscopy
goethite
Adsorption
Polymers
polymer
crystal
quartz
adsorption
salinity
aquatic environment
Heavy Metals
Minerals
heavy metal

Keywords

  • Biofilm
  • extracellular polymeric substances
  • fluorescence spectroscopy
  • iron oxide

Cite this

Li, Lei ; Song, Wenjuan ; Deng, Chunnuan ; Zhang, Daoyong ; Al-Misned, Fahad A. ; Mortuza, M. Golam ; Gadd, Geoffrey Michael ; Pan, Xiangliang. / Effects of pH and salinity on adsorption of hypersaline photosynthetic microbial mat exopolymers to goethite : A study using a quartz crystal microbalance and fluorescence spectroscopy. In: Geomicrobiology Journal. 2016 ; Vol. 33, No. 3-4. pp. 332-337.
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Effects of pH and salinity on adsorption of hypersaline photosynthetic microbial mat exopolymers to goethite : A study using a quartz crystal microbalance and fluorescence spectroscopy. / Li, Lei; Song, Wenjuan; Deng, Chunnuan; Zhang, Daoyong; Al-Misned, Fahad A.; Mortuza, M. Golam; Gadd, Geoffrey Michael; Pan, Xiangliang (Lead / Corresponding author).

In: Geomicrobiology Journal, Vol. 33, No. 3-4, 15.03.2016, p. 332-337.

Research output: Contribution to journalArticle

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T1 - Effects of pH and salinity on adsorption of hypersaline photosynthetic microbial mat exopolymers to goethite

T2 - A study using a quartz crystal microbalance and fluorescence spectroscopy

AU - Li, Lei

AU - Song, Wenjuan

AU - Deng, Chunnuan

AU - Zhang, Daoyong

AU - Al-Misned, Fahad A.

AU - Mortuza, M. Golam

AU - Gadd, Geoffrey Michael

AU - Pan, Xiangliang

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