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- Elgh-Dalgren, Kristin, et al.
(författare)
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Anaerobic bioremediation of a soil with mixed contaminants : Explosives degradation and influence on heavy metal distribution, monitored as changes in concentration and toxicity
- 2009
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Ingår i: Water, Air and Soil Pollution. - Dordrecht : Springer Netherlands. - 0049-6979 .- 1573-2932. ; 202:1-4, s. 301-313
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Tidskriftsartikel (refereegranskat)abstract
- Two soils with explosives and metals were evaluated for the degradation efficiency of explosives by native microorganisms under anaerobic conditions. The commercially available method Daramend®, amended with zero-valent iron (ZVI), was compared with a horse-manure amended compost and a treatment with ZVI alone. In a moderately contaminated soil, Daramend® and ZVI treatment gave significantly higher removal rates compared to compost and control treatments (Tukey’s test, P<0.05). The largest overall decrease in ecotoxicity, measured with bioluminescent bacteria (Vibrio fischeri), was achieved with ZVI-treatment. In a more contaminated soil no degradation of contaminants and no decline in soil toxicity could be distinguished after the same time period. Problems with establishment of anaerobic conditions during parts of the remediation process and low microbial activity due to acute toxicity of contaminants are plausible explanations. Redistribution that could potentially lead to mobilization of the co-contaminant Pb was not observed in either of the soils during the biological treatments.
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- Elgh-Dalgren, Kristin, et al.
(författare)
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Re-cycling of remediated soil : evaluation of leaching tests as tools for characterization
- 2011
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Ingår i: Waste Management. - : Pergamon Press. - 0956-053X .- 1879-2456. ; 31:2, s. 215-224
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Tidskriftsartikel (refereegranskat)abstract
- In Sweden, leaching tests with deionized water (D.W.) are frequently utilized in risk assessment, but implementation of these results to evaluate the risk of spreading in the environment is difficult. One problem is that most leaching procedures only consider heavy metals release, whereas organic pollutants are left out. The aim of the present study was to assess the possible pollutant mitigation in four remediated soils, three with heavy metals and one with polycyclic aromatic hydrocarbons (PAH), utilizing three different leaching solutions: D.W., a weak ionic solution (0.001 M CaCl2) and an artificially made soil water (ASW). In general, batch leaching implied larger contaminant removal than column leaching, possibly due to the more rough treatment of the soil particles, and guidelines would at times be exceeded by batch leaching but not column leaching. Utilization of CaCl2 was found to release much less heavy metal than D.W., whereas the metals mobilized by ASW were removed from solution by the filtration of soil leachates. Low molecular weight PAH was most efficiently mobilized by CaCl2, while D.W. worked better for high molecular weight PAH. Despite very low initial PAH-concentrations, tap- and groundwater criteria were exceeded by all leaching solutions.
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- Hagberg, Jessika, et al.
(författare)
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Determination of dissociation constants of low molecular weight organic acids by capillary zone electrophoresis and indirect UV detection
- 2002
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Ingår i: Chromatographia. - 0009-5893 .- 1612-1112. ; 56:9-10, s. 641-644
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Tidskriftsartikel (refereegranskat)abstract
- A capillary zone electrophoretic (CZE) method has been developed to determine dissociation constants (pK(a)) for anionic, non-UV absorbing species in the range 3.3-4.3. The procedure was evaluated by determining the ply, for two well-characterised low molecular weight organic acids: formic and lactic acids. The results correspond well with literature values (in parentheses): formic acid 3.71 (3.75) and lactic acid 3.84 (3.85). The pK(a) of two polyhydroxycarboxylic acids were also determined, namely 3.64 for gluconic acid and 3.87 for isosaccharinic acid (only poorly described in the literature).
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