著者

丸茂 克美 江橋 俊臣 氏家 亨

出版者

The Society of Resource Geology

雑誌

資源地質 (ISSN:09182454)

巻号頁・発行日

vol.53, no.2, pp.125-146, 2003-12-04 (Released:2009-06-12)

参考文献数

20

被引用文献数

8

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Soil Contamination Countermeasures Law (referred to hereafter as the Law) was made on 29 May 2002, for preventing health damage which toxic substances as Pb, As, Cr(VI) and Cd in soils could cause by oral ingestion.In order to carry out the Law, we must judge whether soils have high toxic metal concentrations or high leachabilities caused by anthropogenic or natural processes. If high toxic metal concentrations or high leachabilities are caused by natural processes, the administration of the Law should not oblige landowners, managers and occupiers of contaminated sites to remedy them.Therefore, it is essential to determine natural levels of Pb, As, Cr(VI) and Cd concentrations and their leachabilities of Japanese soils which have a wide range of chemical and mineralogical composiotion. It is also very important to develop chemical and mineralogical analytical methods to judge whether soils have high toxic metal concentrations or high leachabilities caused by anthropogenic or natural processes.We obtained Pb, As, Cr(VI) and Cd concentrations and leachabilities of stream and marine sediments, as well as soils formed by weathering of volcanic ashes and granite and granitoid, using XRF and conventional wet chemical analytical methods. We also obtained mineralogical data of these sediments and soils, using XRD, TG-DTA and analytical TEM. Furthermore, we obtained lead isotope ratios of these sediments and soils, using ICP-Mass.

著者

伊藤 健一 宮原 英隆 氏家 亨 武島 俊達 横山 信吾 中田 弘太郎 永野 哲志 佐藤 努 八田 珠郎 山田 裕久

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.11, no.4, pp.255-271, 2012 (Released:2012-11-15)

参考文献数

27

被引用文献数

8 11

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In the radiation dosimetry of radiocesium in Iitate, Fukushima, the level of radiocesium around the environment did not exceed the criteria in liquid phases such as puddle water, but was distributed in solid phases such as some soil types and organic matter. On the other hand, retting of the cut bamboo grass and hemlock fir in water allowed the release of radiocesium, about 230 Bq/kg exceeding the criteria for a bathing area. The flow-thru test using zeolite showed the removal of radiocesium from the liquid phase. The wet classification test was performed for 3 types of radiocesium-contaminated soil. According to the results of wet classification, radiocesium was detected and its level exceeded the cropping restriction level in almost all classified particle fractions. The decontamination effect of wet classification on radiocesium contamination was smaller than that on heavy metal contamination. Specifically, the wet classification could not induce volume reduction. Accordingly, preprocessing and intermediate treatments such as dispersion or attrition by vibration or mixing in the wet classification process were devised and examined as improved processing techniques. As a result, the effectual volume reduction of the radiocesium-contaminated soil was confirmed by adding an intermediate process such as the surface attrition in the vibrator.