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Appl Environ Microbiol. 1982 May; 43(5): 1011-1015

Sorption of Cadmium by Microorganisms in Competition with Other Soil Constituents

Ewa Kurek, Janusz Czaban and Jean-Marc Bollag

¹ Department of Agronomy, The Pennsylvania State University, University Park, Pennsylvania 16802

ABSTRACT

The fate of cadmium in soil is influenced to a great extent by microbial activity. Microorganisms were compared with abiotic soil components for their ability to sorb Cd from a liquid medium. When the same amount (on a dry weight basis) of bacterial cells (Serratia marcescens and Paracoccus sp.), clay (montmorillonite), or sand was separately incubated in 0.05 M phosphate buffer, pH 7.2, containing 10 ppm of Cd (10 µg/ml), bacterial cells removed the largest quantity of Cd. Dead cells sorbed much more Cd from the medium than live cells. A comparative study of Cd removal from the medium by seven soil bacteria and four fungi did not indicate appreciable differences. With increasing microbial biomass, the relative efficiency of 0.1 M NaOH as an extractant of sorbed Cd increased, whereas the extraction efficiency of 0.005 M DTPA (diethylenetriaminepentaacetic acid) decreased. It appeared that NaOH and DTPA extracted different chemical forms of Cd. This assumption was supported by vastly different correlation coefficients in the relative amount of Cd extracted by the two solvents.

Present address: Institute of Microbiology, Maria Curie-Sklodowska University, Lublin, Poland.

Paper no. 6308 of the journal series of the Agricultural Experiment Station, University Park, PA 16802.

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