Title of article :
Surface Analysis of Marine Sulphate-Reducing Bacteria Exopolymers on Steel During Biocorrosion Using X-Ray Photoelectron Spectroscopy
Author/Authors :
Sahrani, Fathul Karim Fakulti Sains dan Teknologi - Pusat Pengajian Sains Sekitaran dan Sumber Alam, Malaysia , Abd. Aziz, Madzlan Fakulti Sains - Jabatan Kimia / Biologi, Malaysia , Ibrahim, Zaharah Fakulti Sains - Jabatan Kimia / Biologi, Malaysia , Yahya, Adibah Fakulti Sains - Jabatan Kimia / Biologi, Malaysia
Abstract :
The aim of this study was to determine the surface chemistry during biocorrosion process on growth and on the production of exopolymeric substances (EPS) in batch cultures of mix-strains of marine sulphate-reducing bacteria (SRB) isolated from Malaysian Shipyard and Engineering Harbours, Pasir Gudang. The EPS and precipitates were analyzed by x-ray photoelectron spectroscopy (XPS). The XPS results indicate that Fe(2p3/2) spectrum for iron sulphide can be fitted with Fe(II) and Fe(III) components, both corresponding to Fe-S bond types. The absence of oxide oxygen in the O(1s) spectrum and Fe(III)-O bond types in the Fe(2p3/2) spectrum supports the conclusion that iron sulphides are composed of both ferric and ferrous iron coordinated with monosulphide and disulphide
Keywords :
sulphate , reducing bacteria , biocorrosion , exopolymeric substances , x , ray photoelectron spectroscopy
