Abstract
The effects of chemical speciation on mineralization of organic compounds was studied using citric acid as a model substance. The degradation of14C-labeled Al-, Co-, Cu-, and Zn-citrate was followed in chemically well-defined media inoculated with mixed cultures of microorganisms (soil extracts from two soils). The degradation of citrate was completely inhibited when the acid was bound to Zn, Cu, or Co and partly inhibited when bound to Al. The mineralization of citrate as well as histidine was also followed by incubation of the complexes (Cu, Zn, Al) in the two soils. No effect of metals on the degradation of histidine was seen. The degradation of citrate in soils was also unaffected when complexed to Cu and Zn, whereas Al exerted an inhibited decomposition in both soils.
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Brynhildsen, L., Rosswall, T. Effects of metals on the microbial mineralization of organic acids. Water Air Soil Pollut 94, 45–57 (1997). https://doi.org/10.1007/BF02407092
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DOI: https://doi.org/10.1007/BF02407092