Changes in element availability induced by sterilization in heavy metal contaminated substrates: A comprehensive study

Krauße, Thomas; Schütze, Eileen; Phieler, René; Furst, D.A.; Merten, D.; Büchel, Georg; Kothe, Erika

doi:10.1016/j.jhazmat.2017.11.008

Cited by 13 publications

(9 citation statements)

References 45 publications

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“…The slight changes in DTPA-Cu, Fe, and Mn with irradiation may be due to effects on some soil mineral constituents. For instance, Bank et al [12] found that 20 kGy gamma radiation increased sorption of U (VI) ions by increasing divalent iron in soil and Krausse et al [8] suggested that irradiation with 55 kGy changed hydrous metal oxides, thereby affecting adsorption processes in soil. It has been proposed that gamma irradiation forms OH• and H• radicals which impart oxidizing or reducing properties [4] and reducing conditions generally increase availability of Mn and Fe [48].…”

Section: Gamma-irradiated Samplesmentioning

confidence: 99%

“…Any heat treatment above 40-60 • C (i.e., equivalent to air drying) changes many soil physico-chemical properties, as interlayer water is driven out of the clay matrix, irreversibly changing soil characteristics such as soil surface area and soil structure [6,7]. Dry heat treatments will also change hydrous metal oxides, and this can affect the availability of elements due to changes in sorption characteristics [8]. Fumigation changes chemical properties of soils, making this method unsuitable for samples destined for chemical analysis [4].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, it has been reported that 20-100 kGy gamma irradiation may increase [5,9], decrease [12,13] or not affect [8,10] soil pH. Likewise, micronutrients may increase [5,13,14], decrease [15] or remain unchanged [5,15,16] after gamma irradiation.…”

Section: Introductionmentioning

confidence: 99%

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Gamma Irradiation with 50 kGy Has a Limited Effect on Agronomic Properties of Air-Dry Soil

Wehr

Kirchhof

2021

Soil Systems

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International collaboration on agronomy projects often requires the shipment of soil samples between countries to conduct analyses. However, quarantine regulations in numerous countries restrict the importing of soil samples unless they are sterilized, or analysis is carried out only in quarantine facilities, which greatly increases cost. Yet, sterilization is only an option if it does not change the soil properties. There is conflicting information about the effect of irradiation on soil chemical properties. To assess the effect of gamma irradiation on some soil chemical properties, one hundred randomly selected air-dried (40 °C) soil samples were split into two samples. One sample was left untreated and the other sample was irradiated with 50 kGy as prescribed by Australian biosecurity regulations. Commonly measured agronomic soil chemical properties were then measured and results from the non-irradiated samples were compared to the irradiated samples. The results show no effect of irradiation on soil cation exchange capacity, exchangeable cations, total carbon and nitrogen content, and DTPA-extractable Zn. Small (<5%) but statistically significant effects of irradiation were observed for pH (1:5 water), electric conductivity (EC1:5), DTPA-extractable Cu, Fe and Mn, and Colwell P. The irradiation effects on Fe were greater in the topsoil than subsoil. Considering that irradiation-induced changes to soil chemical properties were below 5%, gamma irradiation can be considered a suitable method to sterilize air-dried soil to meet import requirements, without affecting the interpretation of soil fertility reports.

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Section: Gamma-irradiated Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gamma Irradiation with 50 kGy Has a Limited Effect on Agronomic Properties of Air-Dry Soil

Wehr

Kirchhof

2021

Soil Systems

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“…These Gram-positive bacteria are mostly recognized for their vast metabolic capacity that makes them interesting, among other fields, for bioremediation of soil ( 3 ). Streptomyces mirabilis P16B-1 had been isolated from a former uranium mining site, which features high ambient concentrations of metal ions in the soils ( 2 , 4 ). This strain shows extreme tolerance and grows on media containing 130 mM Ni 2+ or 5 mM Cu 2+ .…”

Section: Introductionmentioning

confidence: 99%

Extremophile Metal Resistance: Plasmid-Encoded Functions in Streptomyces mirabilis

Brangsch

Höller

Krauβe

et al. 2022

Appl Environ Microbiol

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“…The previous studies are mostly concentrated on the total metal concentrations in soil near smelters to assess the potential risks resulted 2 of 11 from excessive accumulation of heavy metals in agricultural crops, which could not accurately represent the part that can be absorbed and utilized by plants [12,13]. Meanwhile, the accurate evaluation for the potential health risks of heavy metals in contaminated soils largely depends on how precisely predicting the uptake concentrations of soil heavy metals by plants [14]. Moreover, although various chemical extraction methods have been developed to estimate the metal bioavailability in soils, the current knowledge of the bioavailability of heavy metals in smelting contaminated soils is still limited [15,16].…”

Section: Introductionmentioning

confidence: 99%

Bioavailability Assessment of Heavy Metals Using Various Multi-Element Extractants in an Indigenous Zinc Smelting Contaminated Site, Southwestern China

Wang

et al. 2021

IJERPH

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Despite recent studies have investigated the strong influences of smelting activities on heavy metal contamination in the soil environment, little studies have been conducted on the current information about the potential environmental risks posed by toxic heavy metals in smelting contaminated sites. In the present study, a combination of the bioavailability, speciation, and release kinetics of toxic heavy metals in the indigenous zinc smelting contaminated soil were reliably used as an effective tool to support site risk assessment. The bioavailability results revealed that the bioavailable metal concentrations were intrinsically dependent on the types of chemical extractants. Interestingly, 0.02 mol/L EDTA + 0.5 mol/L CH3COONH4 was found to be the best extractant, which extracted 30.21% of Cu, 31.54% of Mn, 2.39% of Ni and 28.89% of Zn, respectively. The sequential extraction results suggested that Cd, Pb, and Zn were the most mobile elements, which would pose the potential risks to the environment. The correlation of metal bioavailability with their fractionation implied that the exchangeable metal fractions were easily extracted by CaCl2 and Mehlich 1, while the carbonate and organic bound metal fractions could be extracted by EDTA and DTPA with stronger chelating ability. Moreover, the kinetic modeling results suggested that the chemical desorption mechanism might be the major factor controlling heavy metal release. These results could provide some valuable references for the risk assessment and management of heavy metals in the smelting contaminated sites.

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Changes in element availability induced by sterilization in heavy metal contaminated substrates: A comprehensive study

Cited by 13 publications

References 45 publications

Gamma Irradiation with 50 kGy Has a Limited Effect on Agronomic Properties of Air-Dry Soil

Gamma Irradiation with 50 kGy Has a Limited Effect on Agronomic Properties of Air-Dry Soil

Extremophile Metal Resistance: Plasmid-Encoded Functions in Streptomyces mirabilis

Bioavailability Assessment of Heavy Metals Using Various Multi-Element Extractants in an Indigenous Zinc Smelting Contaminated Site, Southwestern China

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