The impact of radiocesium input forms on its extractability in Fukushima forest soils

Teramage, Mengistu T.; Carasco, Loïc; Orjollet, Daniel; Coppin, Frédéric

doi:10.1016/j.jhazmat.2018.01.047

Cited by 15 publications

(22 citation statements)

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“…The extracted 137Cs concentrations at each four successive extractions were used to estimate the coefficient of distribution, k'd (as the slope of the straight line) of the extractable fraction and the fixed 137Cs fraction in solid materials (as the y-intercept) from the graph plotting the final concentration of 137Cs in the solids against the final 137Cs concentration in the solution obtained at each extraction stage. The detailed sampling and the analysis of the various parameters were the same as described by Teramage et al (2018). ANOVA at the 0.05 significance level was used for statistical analysis and comparison whenever required.…”

Section: Methodsmentioning

confidence: 99%

“…The evolution of 137Cs in terms of water-extractable fraction (w-available) for the liquid contamination only, the acetate-extractable fraction (Ac-available) for both contaminations and the associated distribution coefficient (k'd) during the entire observation period, including the drying and wetting treatment is given in Table 1. Except for the results related to drying and wetting treatment, the rest of the observations have been discussed in detail elsewhere (Teramage et al, 2018). The information is provided here for further comparison and discussion of the results related to the impact of drying and wetting cycle treatments.…”

Section: Impact Of Drying and Wetting On The Availability Of 137cs Anmentioning

confidence: 99%

“…However, in our observation it is clear that the water-extractable 137Cs fraction for this contamination treatment was below a measurable amount, even after drying and wetting cycles. Both low 137Cs in the organic contaminated material or desorption and resorption of 137Cs by mineral particles in the way beyond the water desorption capacity is highly probable, which would result in no water-extractable 137Cs (Teramage et al, 2018), and hence it is not discussed here. Compared to the acetate-extractable 137Cs fraction from the soils contaminated with liquid 137Cs input, the acetate-extractable 137Cs fraction from the soils contaminated with solid (OL and OF)137Cs inputs was generally very low and practically unchanged with time, implying the nature of contamination affects the 137Cs availability and the absence of further 137Cs ageing.…”

Section: Soils Contaminated By Solid 137cs Inputsmentioning

confidence: 99%

“…Therefore, depending on the binding strength, 137Cs in soil can be available and mobile by rain, soil water as well as exudates secreted by plants. In a laboratory incubation experiment using constant soil moisture content, Teramage et al (2018) recently demonstrated that the extractability of 137Cs in forest soils depends on its input forms (i.e., aqueous 137Cs vs. solid organic sources of 137Cs). They found that both the water-and acetate-extractable 137Cs fractions were greater for aqueous amended soils than for solid organic amended soils.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, studies on the impact of drying and wetting cycles in the laboratory can provide information on the behavior of 137Cs in soils of varying moisture contents. The objective of this study was to complete the previous study (i.e., Teramage et al, 2018) by including and investigating the impact of drying and wetting cycles on the 137Cs availability in soils.…”

Section: Introductionmentioning

confidence: 99%

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Impact of drying and wetting cycles on 137Cs ageing in forest soils contaminated with different input forms

Teramage

Carasco

Coppin

2019

Journal of Environmental Radioactivity

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Water and acetate extractable radiocesium (137Cs) concentrations were monitored for >400 days in soils that were amended with aqueous 137Cs or solid organic sources of 137Cs (plant litter or fragmented organic materials) and subjected to a series of wet-dry cycles. The soils were collected from broadleaf and cedar forests in Fukushima, Japan. In soils amended with aqueous 137Cs, the water extractable 137Cs fraction was very low (<1%) and decreased over time while it was below the detection limit in soils amended with solid organic sources of 137Cs. The acetate extractable 137Cs in soil amended with aqueous 137Cs also exhibited an exponential decrease over time (~55% to 30%) but, remained higher than in soils amended by solid organic sources of 137Cs which remained stable (ranging from 2% to 15%). These results collectively indicate that: (1) drying and wetting cycles have little impact on 137Cs availability, possibly due to the relatively short observation period; (2) 137Cs ageing (increased binding to soil) was apparent only when 137Cs was applied in the aqueous form; and (3) both the water and acetate-extractable 137Cs fractions were greater for aqueous amended than for solid organic amended soils. More acetate extractable 137Cs was observed in soils contaminated with broadleaf materials compared to their cedar counterparts, which may be linked to the nature of the organic material itself. For natural conditions, such kind of information is useful to improve our understanding of the evolution of 137Cs availability with time from different contamination sources.

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Section: Methodsmentioning

confidence: 99%

Section: Impact Of Drying and Wetting On The Availability Of 137cs Anmentioning

confidence: 99%

Section: Soils Contaminated By Solid 137cs Inputsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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