Abstract
Citric acid forms ternary mixed-metal complexes with various metal ions involving the hydroxyl and carboxyl groups of citric acid. The coordination of the metal to citric acid has been shown to affect the biodegradation of the metal−citrate complexes and metal mobility in the environ ment. We investigated the formation and biodegradation of the ternary mixed metal Fe−U−citric acid complex. The presence of 1:1:2 Fe−U−citric acid in solution was confirmed by potentiometric titration, UV−vis spectrophotometry, gel-filtration chromatography, and extended X-ray absorption fine structure (EXAFS) analysis. Comparison of the EXAFS spectra shows that the 1:1:2 Fe−U−citric acid complex has structural characteristics similar to the 1:1 U−citric acid complex. Biotransformation studies of Fe(III)−citrate, U(VI)−citrate, and Fe−U−citrate complexes by Pseudomonas fluorescens showed that the binary 1:1 Fe−citric acid was readily biodegraded, whereas the 1:1 U−citric acid complex and the ternary 1:1:2 Fe−U−citric acid com...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
