Recycling EDTA solutions used to remediate metal-polluted soils

Zeng, Qingru; Sauvé, Sébastien; Allen, Herbert E.; Hendershot, William H.

doi:10.1016/j.envpol.2004.06.006

Cited by 98 publications

(34 citation statements)

References 15 publications

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“…The data indicate that the total concentrations of Pb, Cd, Cu, and Zn in both types of soils are significantly higher than Hunan soil background values of heavy metals, and even higher than their respective standard levels set for agricultural soils recommended by the Ministry Environment Protection of China (MEP). These findings are consistent with the results reported by other researchers (Liao et al 2005a, b;Liu et al 2005;Zeng et al 2005). According to Eq.…”

Section: Heavy Metal Pollutionsupporting

confidence: 83%

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Pollution, fractionation, and mobility of Pb, Cd, Cu, and Zn in garden and paddy soils from a Pb/Zn mining area

Lei

Yong

Khan

et al. 2009

Environ Monit Assess

106

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This study was conducted to investigate the pollution load index, fraction distributions, and mobility of Pb, Cd, Cu, and Zn in garden and paddy soils collected from a Pb/Zn mine in Chenzhou City, China. The samples were analyzed using Leleyter and Probst's sequential extraction procedures. Total metal concentrations including Pb, Cd, Cu, and Zn exceeded the maximum permissible limits for soils set by the Ministry of Environmental Protection of China, and the order of the pollution index was Cd > Zn > Pb > Cu, indicating that the soils from both sites seriously suffered from heavy metal pollution, especially Cd. The sums of metal frac- tions were in agreement with the total contents of heavy metals. However, there were significant differences in fraction distributions of heavy metals in garden and paddy soils. The residual fractions of heavy metals were the predominant form with 43.0% for Pb, 32.3% for Cd, 33.5% for Cu, and 44.2% for Zn in garden soil, while 51.6% for Pb, 40.4% for Cd, 40.3% for Cu, and 40.9% for Zn in paddy soil. Furthermore, the proportions of water-soluble and exchangeable fractions extracted by the selected analytical methods were the lowest among all fractions. On the basis of the speciation of heavy metals, the mobility factor values of heavy metals have the following order: Cd (25.2-19.8%) > Cu (22.6-6.3%) > Zn (9.6-6.0%) > Pb (6.7-2.5%) in both contaminated soils.

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Section: Heavy Metal Pollutionsupporting

confidence: 83%

“…Nevertheless, most of the contaminated farmlands are still cultivated presently. There were some previous studies on heavy metal pollution in soils and plants around this area (Liao et al 2005a, b;Liu et al 2005;Zeng et al 2005).…”

Section: Site Descriptionmentioning

confidence: 99%

Pollution, fractionation, and mobility of Pb, Cd, Cu, and Zn in garden and paddy soils from a Pb/Zn mining area

Lei

Yong

Khan

et al. 2009

Environ Monit Assess

106

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“…In order to minimize these problems associated with the use of chelating agents, nowadays research is being focussed on the gradual application of small doses of the chelating agent during the growth period. However, EDTA utilization in the future will most likely be limited to ex situ conditions where control of the leachates can be achieved (Zeng et al 2005). There are other mobilizing agents which are much less harmful to the environments such as citric acid, NTA, and particularly EDDS (Alkorta et al 2004a, b;Tandy et al 2004;Luo et al 2005;Hauser et al 2005).…”

Section: Bioavailability and Phytoremediationmentioning

confidence: 99%

Developments in Bioremediation of Soils and Sediments Polluted with Metals and Radionuclides. 3. Influence of Chemical Speciation and Bioavailability on Contaminants Immobilization/Mobilization Bio-processes

Hullebusch

Lens

Tabak

2005

Rev Environ Sci Biotechnol

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The biotransformation of metals is an exciting, developing strategy to treat metal contamination, especially in environments that are not accessible to other remediation technologies. However, our ability to benefit from these strategies hinges on our ability to monitor these transformations in the environment. That's why remediation of contaminated sediments and soil requires detailed in situ characterization of the speciation of the toxic substances and their transformations with respect to time and spatial distribution. The present paper gives an overview of the literature regarding research performed in the laboratory as well as in the field.

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“…Soil washing, however, has the potential of causing problems. For example, the washing agent EDTA is difficult to decompose (Tandy et al, 2004;Zeng et al, 2005), and hence is detrimental to soil microbial health (BucheliWitschel and Egli, 2001), soil porosity (Heil et al, 1999), and groundwater quality. FeCl 3 and strong acids could acidify soil and adversely affect soil fertility and microbial activity (Rousk et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Immobilization may involve the addition to soil of solid adsorbents such as biochar (Yang et al, 2016;Lu et al, 2017;Wu et al, 2017), while mobilization is often achieved by washing soil with one or more of the following chemicals: metal chelating agents (e.g., EDTA), salts (e.g., CaCl 2 , FeCl 3 ), strong acids (e.g., HCl, CH 3 COOH), or surfactants (e.g., 1-dodecylpyridinium chloride) (Mulligan et al, 2001;Conte et al, 2005;Zeng et al, 2005;Makino et al, 2007Makino et al, , 2008Makino et al, , 2016Kulikowska et al, 2015a,b;Guo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%