2007
DOI: 10.1007/s11224-007-9192-8
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Spectrometric and theoretical investigation of the structures of Cu and Pb/DTPA complexes

Abstract: Spectrometric and theoretical tools have been employed in this study in order to elucidate the structures of DTPA (diethylenetriaminepentaacetic acid) complexed to copper and lead. Mass spectrometry allowed determining the 1:1 stoichiometry of metal:ligand, while infrared spectroscopy demonstrated that both N and O are sites for complexation. 13 C NMR analysis showed the existence of free and complexed carboxyl groups, due to a straight singlet at 180.7 ppm (free carboxylic 13 C) and to a broad signal at 179.3… Show more

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Cited by 27 publications
(16 citation statements)
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“…32,33 Considerando que o DTPA se assemelha muito aos aminoácidos presentes na seiva das plantas, parece razoável atribuir a baixa translocação de metais pesados, notadamente Pb, à formação de estruturas semelhantes nas plantas. .…”
Section: Chumbounclassified
“…32,33 Considerando que o DTPA se assemelha muito aos aminoácidos presentes na seiva das plantas, parece razoável atribuir a baixa translocação de metais pesados, notadamente Pb, à formação de estruturas semelhantes nas plantas. .…”
Section: Chumbounclassified
“…, é absorvido pelas plantas devido à sua semelhança com os metais de transição essenciais, diferindo no que se refere à translocação nas plantas, devido à sua facilidade de formar complexos com elevado impedimento estéreo [5][6]. As altas concentrações de Pb interferem na divisão celular e inibem a extensão do sistema radicular e concentrações abaixo do nível considerado tóxico podem estimular o crescimento radicular [7].…”
Section: +unclassified
“…Vegetable plants growing on heavy metal contaminated medium can accumulate high concentrations of trace elements to cause serious health risk to consumers (LONG et al, 2010). Pb in its cationic form Pb2 + is absorbed by plants because of its similarity with metals essential transition, differing in respect to the translocation plants, due to their ease of forming complexes with high steric hindrance (SILVA et al , 2007a(SILVA et al , , 2007b.…”
Section: Introductionmentioning
confidence: 99%