Environmental Fate of EDTA and DTPA

摘要: EDTA can be extremely persistent in WWTP and also natural waters; DTPA seems more biodegradable. However, the biodegradability of might negligible significance as EDTA, some cases DTPA, are generally found receiving waters many industrial areas, thus being classified one major organic pollutants discharged waters. The photochemical degradation Fe(III) complexes these compounds is documented, but extent to which results applied not clear. There exist still uncertainties chemical speciation, adsorption, overall degradation, ultimately eutrophication effect especially DTPA. It inferred that affect essential nonessential metal balance well aquatic organisms, even long term. estimation speciation a challenging task because complexicity system should based only on equilibrium calculations direct analytical determinations diverse species. Unfortunately, methods for studies at environmentally relevant concentrations available. Also, monitoring or sediments solid particles has been initiated. expected acutely toxic organisms. On other hand, waters, several organisms simultaneously. Therefore, contribute toxicity significantly lower concentration than those determined by short-term tests. directed estimating chronic effects, including possible imbalance body calcium animals certainly desorb heavy metals bound prevent sedimentation, increasing their cycle water. bioavailable free ions. Taken together, compounds, general chemicalization environment. They cause indirect and, under extreme circumstances, effects Thus, release into minimized wherever possible.