Speciation and fate of ethylenediaminetetraacetate (EDTA) in municipal wastewater treatment

Kari, Franz Günter; Giger, Walter

doi:10.1016/0043-1354(95)00125-5

Cited by 181 publications

(100 citation statements)

References 19 publications

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“…However, potential side effects related to the addition of chelants, such as metal leaching to groundwater, have led to health, safety, and environmental concerns. Many synthetic chelants and their complexes with heavy metals can have negative effects on the environment (Bucheli-Witschel and Egli, 2001) and are poorly photo-, chemo-, and biodegradable in soils (Bucheli-Witschel and Egli, 2001;Egli, 2001;Kari and Giger, 1996;Nortemann, 1999). EDDS, a structural isomer of EDTA, is a promising new alternative synthetic chelant.…”

Section: Introductionmentioning

confidence: 99%

Influence of [S, S]-EDDS on Phytoextraction of Copper and Zinc byElsholtzia SplendensFrom Metal-Contaminated Soil

Sun

Luo

et al. 2007

International Journal of Phytoremediation

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Section: Introductionmentioning

confidence: 99%

Influence of [S, S]-EDDS on Phytoextraction of Copper and Zinc byElsholtzia SplendensFrom Metal-Contaminated Soil

Sun

Luo

et al. 2007

International Journal of Phytoremediation

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“…Performance of the solution of Fe(III) in excess EDTA was first checked as a representative metal species, because Fe(III)-EDTA solution is the main EDTA species released from solid waste treatment processes and comprises 20-90% of total EDTA in the effluents (Kari and Giger, 1996;Nowack, 2002). Similar experiments were repeated with aqueous solutions The recovery efficiency of AnaLig TE-01 was much better, compared with Chelex-100, MetaSEP ME-1 and NOBIAS Chelate PA-1.…”

Section: Recovery (%) With Different Spe Materials and Apcsmentioning

confidence: 76%

Non-destructive separation of metal ions from wastewater containing excess aminopolycarboxylate chelant in solution with an ion-selective immobilized macrocyclic material

et al. 2010

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Although the excellent metal-binding capacities of aminopolycarboxylate chelants (APCs) facilitate their extensive use, pre-and post-toxicity of APCs and their high persistence in aquatic environments evoke concerns. Several treatment techniques with a principal focus on the degradation of APCs at the pre-release step have been proposed. Here, we report a technique for the separation of metal ions from waste solution containing excess APCs using a solid phase extraction system with an ion-selective immobilized macrocyclic material, commonly known as a molecular recognition technology (MRT) gel. Synthetic metal solutions with 100-fold chelant content housed in H 2 O matrices were used as samples.The MRT gel showed a higher recovery rate compared with other SPE materials at 20 °C using a flow rate of 0.2 mL min -1 . The effects of solution pH, metal-chelant stability constants and ionic radii were assessed for 32 metals. Compared to the conventional treatment options for such waste solutions, our proposed technique has the advantage of nondestructive separation of both metal ions and chelants. (Ayres, 1970; Bell, 1977; Grasso, 1993;Roundhill, 2001 APCs have been introduced into the natural environment, the aqueous transport of metals, which characteristically form stable complexes with chelates, can be expected to occur (Means et al., 1980;Nowack and VanBriesen, 2005). Residence time of the metals is thus extended, as they are remobilized from soils and sediments into the water phase. EDTA and its homologs are poorly photo-, chemo-and biodegradable in the environment (Means et al., 1980; Bolton Jr. et al., 1993;Kari and Giger, 1995; Egli, 2001;Nowack, 2002;Nörtemann, 2005) and, in most cases, metal complexation raises the threshold values for toxic effects (Sillanpää and Oikari, 1996;Sorvari and Sillanpää, 1996;Sillanpää, 2005).Excess chelant also increases the total nitrogen content and the phosphate solubility in interstitial waters (Norvell, 1984; Horstmann and Gelpke, 1991; Erel and Morgan, 1992;Li and Shuman, 1996; Hering and Morel, 2002).Wastewater with excess APCs entails subsequent separation or degradation treatment before it can be safely discharged. In Europe, treatment of EDTA-containing wastewaters is increasingly required because of the increasingly stringent environmental regulations (Grundler et al., 2005; van Ginkel and Geerts, 2005). Several processes have been proposed for the degradation of APCs to restrict their intrusion to the environment (Sillanpää and Oikari, 1996; Kagaya et al., 1997;Madden et al., 1997;Krapfenbauer and Getoff, 1999;Muñoz and von Sonntag, 2000;Rämö et al., 2000; Bucheli-Witschel and Egli, 2001;Rämö and Sillanpää, 2001;Sillanpää and Pirkanniemi, 2001;Sillanpää and Rämö, 2001;Pirkanniemi et al., 2007). The cost of chelants is also an important issue surrounding their use in metal ion sequestration. Methods that recycle not only the processed water, but also the chelant, may therefore be economically feasible (Lim et al., 2005;Leštan et al., 2008).Separation and pre-conce...

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“…Sodium thiosulfate and ascorbic acid are commonly used to de-chlorinate drinking water; only the latter inhibited toxin detection at 0.01%. EDTA, a persistent pollutant in the environment used worldwide at home and in the industry, is a commonly used chelating agent [14]. There was a significant inhibition in presence of EDTA in the sample when 0.75 ng/mL MC-LR was used.…”

Section: Effects Of Various Water Components On Elisa To Detect Mc-lrmentioning

confidence: 99%

The Effects of Sample Matrices on Immunoassays to Detect Microcystin-LR in Water

Cruz

Lynch²,

Dionysiou³

2012

JEP

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Immunoassays are widely used biochemical techniques to detect microcystins in environmental samples. The use of immunoassays for the detection of microcystins is vulnerable to matrix components and other interferents. This study is an evaluation of the effects of interfering substances commonly found in drinking and ambient water samples using commercially-available immunoassay kits for microcystin toxins. The microplate and strip test immunoassay formats were tested in the study. For the microplate ELISA, the following were found to inhibit microcystin-LR (MC-LR) detection: 250 μg/mL Ca 2+ or Mg 2+ , 0.01% ascorbic acid, 0.1% EDTA chelating agent, 0.05 M glycine-HCl, pH 3. The following exhibited no effect: sodium chloride (NaCl, 1% to 4%) and sodium thiosulfate (0.001% and 0.01%), 0.01 to 0.1 M phosphate buffers (PB), pH 7 and 0.067 M PB at pH 5, 6, 7 and 8. Overall, up to 50 μg/mL of standard and reference natural organic matter (NOM) from various sources did not interfere in the assay system (without MC-LR) but diminished the detection of MC-LR at varying degrees. This is the first study evaluating standard and reference humic and fulvic acids from various sources in immunoassays for microcystins. The strip test also showed variable effects on MC-LR detection in the presence of NOM. This assay format was also sensitive to varying pHs and ionic strengths. MC-LR binding was inhibited at low pH (0.05 M glycine-HCl, pH 3), whereas, 0.067 M PB with pH 6, 7 and 8 can yield false positive results. Lower ionic strength of 0.01 M PB, pH 7 showed no interference in MC-LR binding whereas higher ionic strengths can interfere with MC-LR detection. NaCl at 3% and 4% can interfere with the analysis giving false positive results. Mg 2+ at 50 and 250 μg/mL showed no effect on the analysis while the same concentration of Ca 2+ can yield false positive results. The performance in marine, brackish and hard waters should be tested given the potential sensitivity to salinity. Results of this study may assist in the further refinement of existing assays and the development of practical antibody-based methods to clean-up samples and detect cyanotoxins in water.

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Speciation and fate of ethylenediaminetetraacetate (EDTA) in municipal wastewater treatment

Cited by 181 publications

References 19 publications

Influence of [S, S]-EDDS on Phytoextraction of Copper and Zinc byElsholtzia SplendensFrom Metal-Contaminated Soil

Influence of [S, S]-EDDS on Phytoextraction of Copper and Zinc byElsholtzia SplendensFrom Metal-Contaminated Soil

Non-destructive separation of metal ions from wastewater containing excess aminopolycarboxylate chelant in solution with an ion-selective immobilized macrocyclic material

The Effects of Sample Matrices on Immunoassays to Detect Microcystin-LR in Water

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