Impacts of microbial activity on the optical and copper-binding properties of leaf-litter leachate.

Frontiers in Microbiology
C W Cuss, C Guéguen

Abstract

Dissolved organic matter (DOM) is a universal part of all aquatic systems that largely originates with the decay of plant and animal tissue. Its polyelectrolytic and heterogeneous characters make it an effective metal-complexing agent with highly diverse characteristics. Microbes utilize DOM as a source of nutrients and energy and their enzymatic activity may change its composition, thereby altering the bioavailability and toxicity of metals. This study investigated the impacts of microbial inoculation upon the optical and copper-binding properties of freshly produced leaf-litter leachate over 168 h. Copper speciation was measured using voltammetry, and using fluorescence quenching analysis of independent fluorophores determined using parallel factor analysis (PARAFAC). Two protein/polyphenol-like and two fulvic/humic-like components were detected. Thirty-five percent of total protein/polyphenol-like fluorescence was removed after 168-h of exposure to riverine microbes. The microbial humic-like and tryptophan-like PARAFAC components retained significantly different log K values after 168 h of incubation (p < 0.05), while their complexing capacities were similar. Using voltammetry, a sixfold increase in copper-complexing capacit...Continue Reading

Citations

May 12, 2018·Environmental Science and Pollution Research International·Scott HumeStefan Siemann
Dec 22, 2020·Water Research·Urban J Wünsch, Kathleen Murphy

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Methods Mentioned

BETA
Fluorescence
fluorescence scattering

Software Mentioned

Statistica
MATLAB
StatSoft
DOMFluor

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