1367. Remediation of metal contaminated soil by organic metabolites from fungi i-production of organic acids - Arwidsson Z., Johansson E., Von Kronhelm T. et al. [Z. Arwidsson, Man-Technology-Environment Research Centre, School of Science and Technology, Orebro University, Orebro 701 82, Sweden] - WATER AIR SOIL POLLUT. 2010 205/1-4 (215-226) - summ in ENGLrnInvestigations were made on living strains of fungi in a biore-mediation process of three metal (lead) contaminated soils. Three saprotrophic fungi (Aspergillus niger, Penicillium bilaiae, and a Penicillium sp.) were exposed to poor and rich nutrient conditions (no carbon availability or 0.11 M d-glucose, respectively) and metal stress (25 μM lead or contaminated soils) for 5 days. Exudation of low molecular weight organic acids was investigated as a response to the metal and nutrient conditions. Main organic acids identified were oxalic acid (A. niger) and citric acid (P. bilaiae). Exudation rates of oxalate decreased in response to lead exposure, while exudation rates of citrate were less affected. Total production under poor nutrient conditions was low, except for A. niger, for which no significant difference was found between the poor and rich control.
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