Toxicity evaluation of complex metal mixtures using reduced metal concentrations: application to iron oxidation by Acidithiobacillus ferrooxidans.

Abstract:

:In this study, we investigated the inhibition effects of single and mixed heavy metal ions (Zn2+, Ni2+, Cu2+, and Cd2+) on iron oxidation by Acidithiobacillus ferrooxidans. Effects of metals on the iron oxidation activity of A. ferrooxidans are categorized into four types of patterns according to its oxidation behavior. The results indicated that the inhibition effects of the metals on the iron oxidation activity were noncompetitive inhibitions. We proposed a reduced inhibition model, along with the reduced inhibition constant (alpha i), which was derived from the inhibition constant (KI) of individual metals and represented the tolerance of a given inhibitor relative to that of a reference inhibitor. This model was used to evaluate the toxicity effect (inhibition effect) of metals on the iron oxidation activity of A. ferrooxidans. The model revealed that the iron oxidation behavior of the metals, regardless of metal systems (single, binary, ternary, or quaternary), is closely matched to that of any reference inhibitor at the same reduced inhibition concentration, [I]reduced, which defines the ratio of the inhibitor concentration to the reduced inhibition constant. The model demonstrated that single metal systems and mixed metal systems with the same reduced inhibitor concentrations have similar toxic effects on microbial activity.

journal_name

J Microbiol Biotechnol

authors

Cho KS,Ryu HW,Choi HM

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

1298-307

issue

7

eissn

1017-7825

issn

1738-8872

pii

7481

journal_volume

18

pub_type

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