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Effect of Extraction Variables on the Biodegradable Chelant-Assisted Removal of Toxic Metals from Artificially Contaminated European Reference Soils

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Development of aminopolycarboxylate chelants (APCs) having enhanced biodegradability is gaining increasing focus to replace the EDTA and its homologs with those used widely for the ex situ treatment of contaminated soils and are potential eco-threats. The paper reports the chelant-assisted extraction of the toxic metals (Cd, Cu, Pb, and Zn) from the metal-spiked European reference soils (Eurosoil 1 and Eurosoil 4) using biodegradable APCs, namely EDDS, GLDA, and HIDS. The effects of chelant-to-metal molar ratio, solution pH, and metal/chelant stability constants were evaluated, and compared with that of EDTA. The selectivity aptitude of the biodegradable chelants towards the toxic metals was assumed from the speciation calculations, and a proportionate correlation was observed at neutral pH. Pre- and post-extractive solid phase distributions of the target metals were defined using the sequential extraction procedure and dissolution of metals from the theoretically immobilized fraction was witnessed. The effect of competing species (Al, Ca, Fe, Mg, and Mn) concentrations was proven to be minimized with an excess of chelant in solution. The highlight of the outcomes is the superior decontamination ability of GLDA, a biodegradable APC, at minimum chelant concentration in solution and applicability at a wide range of pH environments.

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This research was partially supported by the Grants-in-Aid for Scientific Research (24310056 and 24·02029) from the Japan Society for the Promotion of Science. Additionally, the authors (ZAB and IMMR) wish to thank Mr. Rauful Alam (Department of Organic Chemistry, Stockholm University, Sweden) for his generous support in collecting the literatures.

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Correspondence to Zinnat A. Begum or Hiroshi Hasegawa.

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Begum, Z.A., Rahman, I.M.M., Sawai, H. et al. Effect of Extraction Variables on the Biodegradable Chelant-Assisted Removal of Toxic Metals from Artificially Contaminated European Reference Soils. Water Air Soil Pollut 224, 1381 (2013). https://doi.org/10.1007/s11270-012-1381-4

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  • Soil remediation
  • Ex situ
  • Eurosoil
  • Aminopolycarboxylate chelants
  • Biodegradable
  • EDDS
  • GLDA
  • HIDS
  • Chelant-to-metal molar ratio
  • pH
  • Metal/chelant stability constant
  • Sequential extraction