Influence of metal complex formation on heavy metal and free EDTA and DTPA acute toxicity determined by Daphnia magna

Sorvari, Jaana; Sillanpää, Mika

doi:10.1016/0045-6535(96)00251-2

Cited by 81 publications

(45 citation statements)

References 13 publications

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“…The increasing amounts of loosely bound Cu occurred in descending sequence as follows: DTPA [ EDTA [ EDDS [ CA, which indicates that DTPA was the most effective chelator for transforming stable adsorbed Cu to loosely bound Cu, due to the stability constant commonly expressed as log K; the higher the stability constant, the higher the complexing ability. The stability constants (log K) for DTPA-Cu, EDTA-Cu, EDDS-Cu and CA-Cu were 21.2, 20.5, 18.4 and 7.6, respectively, indicating that DTPA was the most prominent chelator for enhancing Cu complexing, while CA was the least effective (Sorvari and Sillanpaa 1996;Sillanpaa and Oikari 1996;Bostjan and Domen 2004;Polettini et al 2007). …”

Section: Resultsmentioning

confidence: 99%

“…For instance, the stability constants (log K) of Zn for EDDS, EDTA, DTPA and CA were 13.5, 16.5, 18.3 and 6.1, respectively, and the stability constants (log K) of Cu for EDDS, EDTA, DTPA and CA were 18.4, 20.5, 21.2 and 7.6, respectively (Sillanpaa and Oikari 1996;Sorvari and Sillanpaa 1996;Bostjan and Domen 2004;Polettini et al 2007;Meers et al 2008). Similar extraction results have been found by other researchers (Polettini et al 2007).…”

Section: Reedsmentioning

confidence: 99%

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Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

Yeh

Lin

et al. 2014

Int. J. Environ. Sci. Technol.

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The phytoextraction of copper and zinc assisted by the chelators such as ethylene diamine tetraacetic acid, diethylene triamino pentaacetic acid, ethylene diamine disuccinate and citric acid into sunflowers (Hh can act as effective cation exchangers. The negatively charged chelator complexes prevented binding to the cell walls of the roots and allowed complexes to enter the cells. Organic content contains fewer soil nutrients and has fewer negatively charged functional groups, such as carboxical, phenolical and hydroxyl; these adsorb negative free metal cations and reduce metal mobility, leading to less plant uptake. Regardless of different soils' varying organic content, plant propagation ability can be listed in descending order as follows: cattails [ reeds [ sunflowers [ Chinese cabbage. The mechanism of metal uptake was apoplastic transportation. Metal accumulation levels in different parts of plants are listed in descending order as follows: roots [ stems [ leaves. This is similar to the findings of most studies.

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Section: Resultsmentioning

confidence: 99%

Section: Reedsmentioning

confidence: 99%

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

Yeh

Lin

et al. 2014

Int. J. Environ. Sci. Technol.

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“…The toxicity of mercury in aquatic organisms is infl uenced by the chemical speciation of mercury, the exposure related properties and the sensitivity or tolerance of the organism [13][14][15]. Inorganic mercury is less acute toxic to aquatic organisms than methyl mercury, but the range in sensitivity between species for either compound is large.…”

Section: Introductionmentioning

confidence: 99%

Some ecological effects of underwater self-explosion of ammunition in lake lomtjärn, sweden: the impact from mercury

Liljedahl¹,

Qvarfort²,

Berglind³

et al. 2012

Int. J. DNE

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After the Second World War, dumping in lakes was a rational way to solve the security problem with the extensive amount of unreliable or unused ageing ammunition. Most commonly the ammunition was dumped in sealed boxes or as pieces. In some cases the ammunition was deliberately detonated when dumped. In Lake Lomtjärn, a small lake in central Sweden, extremely high levels of mercury (300 mg/kg dry weight Hg) were detected in the sediments. The mercury was expected to originate from years of dumping followed by an underwater self-explosion of ignition capsule containing mercury. The lake is unique in the sense that the mercury levels are among the highest found so far in Sweden and that no other source of pollutant is present in the area. The aim of this study was to evaluate the environmental impact from the underwater explosion. Samples of sediment, bottom water, surface water, bottom fauna, littoral fauna and fi sh (muscle and liver) were analysed for metals as well as physical parameters in order to investigate effects on biota. Acute toxicity of bottom water was determined by Daphnia magna. Results showed very high mercury content (2-338 mg/kg dry weight) in sediment down to 15 cm depth evenly distributed over the whole lake and low levels for other heavy metals (As, Cd, Cu, Pb and Zn). Water showed low levels of mercury (0.02 µg/L in bottom and surface water) as for the other heavy metals (As, Cd, Cu, Pb and Zn). Disturbance of bottom fauna was found for BQI index and O/C index. Disturbance in littoral fauna was seen around the lake (low taxa in six families, ASPT index 5.4. Danish fauna index 4 and acidity index 2). Acute toxicity (Daphnia magna) was high. Levels of mercury in perch were high (muscle 0.6-3.59 mg/kg and liver 1.05-7.64 mg/kg). It was concluded that the underwater detonation of ammunition in Lake Lomtjärn has caused very high levels of mercury in the sediment and a high impact on the ecological chain. In risk assessments aiming to remediation decisions it is recommended early to highlight expected ecological pathways of (mercury) and relevant biomarkers in the ecosystem of concern.

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confidence: 99%

“…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).…”

mentioning

confidence: 99%

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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Influence of metal complex formation on heavy metal and free EDTA and DTPA acute toxicity determined by Daphnia magna

Cited by 81 publications

References 13 publications

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

Chelator-enhanced phytoextraction of copper and zinc by sunflower, Chinese cabbage, cattails and reeds

Some ecological effects of underwater self-explosion of ammunition in lake lomtjärn, sweden: the impact from mercury

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

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