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Orientador(es)
Resumo(s)
The ready biodegradability of four chelating agents, N,N -(S,S)-bis[1-carboxy-2-(imidazol-4-yl)ethyl]ethylenediamine (BCIEE), N -
ethylenedi-L-cysteine (EC), N,N -bis (4-imidazolymethyl)ethylenediamine (EMI) and 2,6-pyridine dicarboxylic acid (PDA), was
tested according to the OECD guideline for testing of chemicals. PDA proved to be a readily biodegradable substance. However,
none of the other three compounds were degraded during the 28 days of the test. Chemical simulations were performed for the four
compounds in order to understand their ability to complex with some metal ions (Ca, Cd, Co, Cu, Fe, Mg, Mn, Ni, Pb, Zn) and
discuss possible applications of these chelating agents. Two different conditions were simulated: (i) in the presence of the chelating
agent and one metal ion, and (ii) in the simultaneous presence of the chelating agent and all metal ions with an excess of Ca. For
those compounds that were revealed not to be readily biodegradable (BCIEE, EC and EMI), applications were evaluated where this
property was not fundamental or even not required. Chemical simulations pointed out that possible applications for these chelating
agents are: food fortification, food process, fertilizers, biocides, soil remediation and treatment of metal poisoning. Additionally,
chemical simulations also predicted that PDA is an efficient chelating agent for Ca incrustations removal, detergents and for pulp
metal ions removal process.
Descrição
Palavras-chave
N,N -(S, S)-bis[1-carboxy-2-(imidazol-4-yl)ethyl]ethylenediamine (BCIEE) N -ethylenedi-L-cysteine (EC) N,N -bis (4- imidazolymethyl)ethylenediamine (EMI) 2,6-pyridine dicarboxylic acid (PDA) ready-biodegradability
Contexto Educativo
Citação
Editora
Taylor & Francis