Chelating Agents in the Environment

Nowack, Bernd; VanBriesen, Jeanne M.

doi:10.1021/bk-2005-0910.ch001

Cited by 60 publications

(58 citation statements)

References 60 publications

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“…One such pollutant is a synthetic chelating agent, ethylenediaminetetraacetic acid (EDTA), which is widely used in a broad range of domestic products and industrial applications (Bucheli- Witschel and Egli 2001;Nowack and VanBriesen 2005;Nö rtemann 2005). The presence of EDTA in municipal and industrial wastewater at high concentrations may lead to the remobilization of metals from sediments and aquifers, consequently posing a risk to groundwater and drinking water (Sillanpaa 1997;Bucheli-Witschel and Egli 2001;Nowack 2002;Wenger et al 2005;Nowack and VanBriesen 2005;Nö rtemann 2005). The largest concern is that EDTA is a highly persistent compound; microorganisms capable of utilization of EDTA and metal-EDTA complexes are rare in nature (Bucheli- Witschel and Egli 2001;Weilenmann et al 2004;Nö rtemann 2005).…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on bacterial degradation of EDTA in pH-auxostat

Minkevich

Satroutdinov

Dedyukhina

et al. 2006

World J Microbiol Biotechnol

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The effect of temperature on the maximum specific growth rate and the cell yield was studied during cultivation of two bacterial strains (LPM-4 and Pseudomonas sp. LPM-410) on EDTA under unlimited cell growth conditions in a pH-auxostat. Both strains displayed linear dependence of reciprocal biomass yield against reciprocal specific growth rate, from which the values of rate of substrate expenditure for cell maintenance and the ''maximum'' yield (i.e., hypothetical yield without cell maintenance processes) were estimated. Analysis of the maximum yield values based on mass-energy balance theory suggested that oxidation of the carboxylic acid side chains of EDTA by a monooxygenase had zero or low energetic efficiency. An Arrhenius equation with different values of Arrhenius parameters within different temperature ranges gave a good fit with the temperature dependence of both growth rate and biomass yield. Specific growth rates of both strains showed a more pronounced temperature dependence than did the cell yields. A possible kinetic mechanism was suggested which might be responsible for the modes of the temperature dependences of specific growth rate and yield that were found. The mechanism is based on a hypothetical key substance governing the metabolic flows, which is formed in a zero-order reaction and destroyed in a first-order reaction, both rate constants depending on temperature according to the Arrhenius law.

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Section: Introductionmentioning

confidence: 99%

The effect of temperature on bacterial degradation of EDTA in pH-auxostat

Minkevich

Satroutdinov

Dedyukhina

et al. 2006

World J Microbiol Biotechnol

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“…Also, in other species like Helianthus annuus or Brassica juncea, EDTA significantly increased the translocation of metals within the plants (Hsiao et al 2007;Turgut et al 2004). In general, the extraction of metals from the soil into the plant in phytoremediation is also greatly improved by the addition of chelating agents (Freitas et al 2014), taking also advantage of the fact that chelators have a high affinity to many different metals (Nowack and VanBriesen 2005). Therefore, chelators minimize the amount of free Ni ions (Table 1) but this is not relevant for metal uptake and translocation within the plant.…”

Section: Discussionmentioning

confidence: 99%

Ni tolerance and its distinguished amelioration by chelating agents is reflected in root radius of B. napus cultivars

et al. 2018

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The negative effect of excess nickel (Ni) on plants is well investigated but there is only little information on its influence on root anatomy and a possible amelioration by chelating agents. In this study, we utilized light microscopy to observe anatomical changes in canola (Brassica napus) roots and investigated the element content by X-ray microanalysis. Ni-tolerant (Con-II) and Ni-sensitive cultivars (Oscar) were selected for this purpose. The plants were treated with 30 ppm NiSO 4 . Then, citric acid and ethylene-diamine-tetra-acetic acid (EDTA) (alone or in combination) were applied to observe the influence of chelating agents in metal stress amelioration. Ni treatment led to significant swelling of the roots in the Con-II variety as compared to the cultivar Oscar. Application of EDTA reduced the root radius of Con-II plants and this effect for Ni tolerance is discussed. According to Xray microanalyses, Ni ions were more dispersed in the sensitive cultivar as indicated by metal adsorption to the cell wall. We investigate the hypothesis that an enhanced capacity of binding metals to the cell wall allows the plants to tolerate more heavy metals.

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“…In the second break, the concentrations of heavy metals in fruiting bodies, in general, were much lower than those in the first break, which may be partly due to the depletion of available metal and degradation of the chelator, especially for NTA and CA [11,43]. NTA was found to be degraded as fast as CA in soils and was also rapidly degraded under anaerobic conditions, whereas EDTA was not easily degraded [44][45][46]. It is probable that the biodegradation of NTA or CA was responsible for the lack of bioextration efficiency seen.…”

Section: Effects Of Chelators On Biomass Production and Heavy Metal Cmentioning

confidence: 92%

Chelator-induced bioextraction of heavy metals from artificially contaminated soil by mushroom (Coprinus comatus)

Cen

Chen

et al. 2012

Chemistry and Ecology

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This study investigated the potential use of chelator-induced bioextraction of heavy metals from soil by Coprinus comatus in a pot experiment. Two production waves of the mushroom were obtained to determine biomass and metal concentration. The application of ethylenediaminetetraacetic acid (EDTA) or nitrilotriacetate (NTA) slightly inhibited the growth of C. comatus, but significantly enhanced the accumulation of heavy metals in fruiting bodies compared with the control. The highest concentrations of Pb, Cu and Cd reached 900.60, 783.61 and 23.64 mg·kg −1 in a single pot, respectively. However, application of citric acid (CA) had no effect on metal uptake. Moreover, chelators applied to soil after fructification increased the dry biomass and metal concentration in fruiting bodies compared with those applied before sowing mycelia. EDTA was more efficient for inducing metal uptake by C. comatus than NTA or CA, and split applications of EDTA after fructification resulted in the highest total metal uptake by mushroom, i.e. 19.08 ± 2.84, 17.57 ± 0.69 and 0.55 ± 0.06 mg for Pb, Cu and Cd, respectively, which were 130, 12 and 5 times values obtained with the control. Interestingly, many mushrooms turned blue after soil had been treated with chelator, indicating that these mushrooms are rich in Cu.

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Chelating Agents in the Environment

Cited by 60 publications

References 60 publications

The effect of temperature on bacterial degradation of EDTA in pH-auxostat

The effect of temperature on bacterial degradation of EDTA in pH-auxostat

Ni tolerance and its distinguished amelioration by chelating agents is reflected in root radius of B. napus cultivars

Chelator-induced bioextraction of heavy metals from artificially contaminated soil by mushroom (Coprinus comatus)

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