Effects of zeolite and vermiculite addition on exchangeable radiocaesium in soil with accelerated ageing

Yamaguchi, Noriko; Hikono, Atsuko; Saito, Takashi

doi:10.1016/j.jenvrad.2019.02.011

Cited by 14 publications

(4 citation statements)

References 35 publications

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“…Our work showed that phytoavailability of 137 Cs assessed by TF of rice and exchangeable 137 Cs fraction of the soil continue to decrease even after 4 to 8 years from the fall out in an actual paddy field in Iitate Village in Fukushima Prefecture This slow decrease may be partly due to the type of soil of the allophanic Andosol of the test field, lower ageing speed, compared to mineral soil, 14,15) and also due to probable presence of 137 Cs in organic materials not exchangeable (co. 6% in case of Date-city soil 7) ) in soil and 137 Cs in harvest residue returned which may…”

Section: Resultsmentioning

confidence: 68%

“…The annual decrease rate by year of 13% is much less than those of the TF of about 40%, suggesting other factor (s) not identified concerned. Further, this is less than the annual decrease rate of 34% calculated from the data in Tsukada s report 7) of a paddy field in Date-city in Fukushima during 1.5 years from 2012 to 2013, but more than that of 4-10% calculated from the half-time of 6.6-17.7 year of 137 Cs/ 133 Cs in the exchangeable fraction, using the data from 2011 to 2015, as better index of 137 Cs fixation by ageing 10) This consecutive field work from 2015 to 2019 indicates that 137 Cs in the soil was gradually transformed to a form more difficult to be absorbed by rice, that is considered due to gradual radiocesium fixation with ageing, as shown by Roig et al, 4) Absalom et al, 14) Yamaguchi et al 15,16) and Takeda et al 17,18) who investigated fixation mechanism and conditions in details mainly under artificial conditions. However, their data are from those within 3 years from radiocesium fall-out or addition to soils.…”

Section: Resultsmentioning

confidence: 97%

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Annual Reduction of Transfer Factor of Radiocesium from Soil to Rice Cultivated in a KCl Fertilized Paddy Field from 2015 to 2019

Ichio¹,

Nihei

Hirose

et al. 2021

RADIOISOTOPES

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We performed consecutive field trials of rice cultivation to monitor radiocesium contamination in harvested rice from 2012, in the Iitate Village in Fukushima Prefecture, where people were forced to be evacuated due to high level of radioactive contamination caused by the disaster at the Fukushima Dai-ichi Nuclear Power Plant of Tokyo Electric Power. The early year results (2012-2013) 1,2) showed the radiocesium concentration in the brown rice was reduced depending on the decontaminated level of paddy soil and on the exchangeable K content of the soil. This report of later year results (2015)(2016)(2017)(2018)(2019) showed further more than 80% reduction of 137 Cs concentration in the brown rice and straw at KCl fertilized paddy soil, in spite of little reduction of 137 Cs concentration of the soil. The transfer factor of 137 Cs from soil to brown rice reduced from 0.0022 in 2015 to 0.0003 in 2019 and that to straw reduced from 0.0262 in 2015 to 0.0028 in 2019, respectively. Exchangeable positive ions of the soil were also analyzed. Multiple regression analyses of all data of transfer factor in 2015 to 2019 to year (ageing) and exchangeable K ion as variables shows that the main causal factor is year (ageing) with some supportive effect of increase of exchangeable K ion. This implicates that radiocesium in soil was gradually transformed to a form more difficult to be absorbed by rice, that is, 137 Cs immobilization or fixation on clay minerals by ageing, not only in early years after the accident (

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 97%

Annual Reduction of Transfer Factor of Radiocesium from Soil to Rice Cultivated in a KCl Fertilized Paddy Field from 2015 to 2019

Ichio¹,

Nihei

Hirose

et al. 2021

RADIOISOTOPES

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“…The authors found that none of their tested plant species resulted in a significant decrease in radiocesium in soil likely because of the strong fixation of 137 Cs to clay particles. This result was confirmed by Yamashita et al (2014), who showed that 99 wild plants grown in paddy and upland fields had a very low phytoextraction efficiency. Tamaoki et al (2016) reached the same conclusions, although they suggested Kochia (Bassia scoparia) as a potential candidate for phytoremediation even though its efficiency in removing 137 Cs would require numerous cultivation rounds.…”

Section: Soil and Farmland Decontamination And Soil To Plant Transfersmentioning

confidence: 62%

Effectiveness of landscape decontamination following the Fukushima nuclear accident: a review

Evrard

Laceby

Nakao

2019

SOIL

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The Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident in March 2011 resulted in the contamination of Japanese landscapes with radioactive fallout. Accordingly, the Japanese authorities decided to conduct extensive remediation activities in the impacted region to allow for the relatively rapid return of the local population. The objective of this review is to provide an overview of the decontamination strategies and their potential effectiveness in Japan, focussing on particle-bound radiocesium. In the Fukushima Prefecture, the decision was taken to decontaminate the fallout-impacted landscapes in November 2011 for the 11 municipalities evacuated after the accident (Special Decontamination Zone -SDZ -1117 km 2 ) and for the 40 non-evacuated municipalities affected by lower, although still significant, levels of radioactivity (Intensive Contamination Survey Areas, 7836 km 2 ). Decontamination activities predominantly targeted agricultural landscapes and residential areas. No decontamination activities are currently planned for the majority of forested areas, which cover ∼ 75 % of the main fallout-impacted region. Research investigating the effectiveness of decontamination activities underlined the need to undertake concerted actions at the catchment scale to avoid renewed contamination from the catchment headwaters after the completion of remediation activities. Although the impact of decontamination on the radioactive dose rates for the local population remains a subject of debate in the literature and in the local communities, outdoor workers in the SDZ represent a group of the local population that may exceed the long-term dosimetric target of 1 mSv yr −1 . Decontamination activities generated ∼ 20 million m 3 of soil waste by early 2019. The volume of waste generated by decontamination may be decreased through incineration of combustible material and recycling of the less contaminated soil for civil engineering structures. However, most of this material will have to be stored for ∼ 30 years at interim facilities opened in 2017 in the vicinity of the FDNPP before being potentially transported to final disposal sites outside of the Fukushima Prefecture. Further research is required to investigate the perennial contribution of radiocesium from forest sources. In addition, the re-cultivation of farmland after decontamination raises additional questions associated with the fertility of remediated soils and the potential transfer of residual radiocesium to the plants. Overall, we believe it is important to synthesise the remediation lessons learnt following the FDNPP nuclear accident, which could be fundamental if a similar catastrophe occurs somewhere on Earth in the future.

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“…In addition, additives such as zeolite or Prussian blue adsorbents must be added to Andisols to avoid the transfer of residual radioactive cesium to plants. The problem with this strategy is that, as a result of exploitation, zeolites can increase the exchangeability of 137 Cs with potassium and accelerate the transfer of 137 Cs into crop plants for longer periods [Yamaguchi et al, 2019]. These limitations show the difficulty of finding the alternatives to storing waste of decontaminated soil at intermediate sites.…”

Section: Substantiation Of the Fixation Mechanisms Of Radionuclides And Heavy Metalsmentioning

confidence: 99%

Integration of Processes of Radionuclide-Contaminated Territories Decontamination in the Framework of Their Ecological-Socio-Economic Rehabilitation

Chernysh¹,

Bálintová²,

Shtepa³

et al. 2022

Ecol. Eng. Environ. Technol.

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Effects of zeolite and vermiculite addition on exchangeable radiocaesium in soil with accelerated ageing

Cited by 14 publications

References 35 publications

Annual Reduction of Transfer Factor of Radiocesium from Soil to Rice Cultivated in a KCl Fertilized Paddy Field from 2015 to 2019

Annual Reduction of Transfer Factor of Radiocesium from Soil to Rice Cultivated in a KCl Fertilized Paddy Field from 2015 to 2019

Effectiveness of landscape decontamination following the Fukushima nuclear accident: a review

Integration of Processes of Radionuclide-Contaminated Territories Decontamination in the Framework of Their Ecological-Socio-Economic Rehabilitation

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