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12- Effect of pyoverdin I
produced by Pseudomonas aeruginosa on the mobilization of copper (II)
and iron (III) contaminated in natural soil and sea sand samples
Panadda T.
Tansupo1, Herbert Budzikiewicz2, Saksit Chanthai1
& Chalerm Ruangviriyachai1*
1Department of Chemistry, Faculty of
Science,
Khon
Kaen
University, Khon
Kaen
40002,
Thailand,
e-mail:
chal_ru@kku.ac.th,
Tel. 66-4302-2222-41 ext. 12243, Fax. 66-4320-2373
2Institute
of Organic Chemistry, University of
Cologne, 50939
Cologne,
Germany
Abstract
The effect of pyoverdin I, a natural product from Pseudomonas
aeruginosa strain found in Thailand, on the availability of Cu2+
and Fe3+ ions contaminated in natural soil and sea sand
samples was investigated. The mobilized concentrations of both metal
ions in the different sample matrices were determined by atomic
absorption spectrometry. It was found that the presence of pyoverdin
I in both sample extracts mainly as metal-pyoverdin I complexes could
significantly increase the amount of extractable Cu2+ and
Fe3+ compared with control. The adsorption and desorption
of these metal ions depend directly on pH variation of the soil and
sand solutions due to differences in the metal species and their
organic matter. From these results, it is implied that the ability of
pyoverdin I to mobilize such metal ions in the natural contaminated
soil indicates its important roles in soil extraction and weathering
as well as soil toxicity and remediation. Therefore, the mobilization
of the metal ions by the bacterial pyoverdin I as a function of pH can
suggest a transport mechanism for chemical association of heavy metals
in soil.
Keywords:
Pyoverdin I; mobilization; copper; iron; natural soil; sea sand
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