Leaching characteristics of naturally derived toxic elements in the alluvial marine clay layer beneath Osaka Plain, Japan: implications for the reuse of excavated soils
| العنوان: | Leaching characteristics of naturally derived toxic elements in the alluvial marine clay layer beneath Osaka Plain, Japan: implications for the reuse of excavated soils |
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| المؤلفون: | Hiroko Ito, Harue Masuda, Akihiko Oshima |
| المصدر: | Environmental Earth Sciences. 78 |
| بيانات النشر: | Springer Science and Business Media LLC, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 0208 environmental biotechnology, Soil Science, 02 engineering and technology, 010501 environmental sciences, Silt, ホウ素, complex mixtures, 01 natural sciences, Groundwater pollution, Environmental Chemistry, Leaching (agriculture), ヒ素, 0105 earth and related environmental sciences, Earth-Surface Processes, Water Science and Technology, lead, Global and Planetary Change, arsenic, Geology, Contamination, excavated surplus soils, Pollution, 020801 environmental engineering, Environmental chemistry, Soil water, Environmental science, host phases of toxic elements, Alluvium, boron, Clay minerals, 鉛, Groundwater, 大阪平野 |
| الوصف: | The contamination risks by naturally derived toxic elements must be assessed to achieve a sustainable geo-environment when utilizing excavated surplus soils. To estimate the controlling factors and risks of groundwater pollution associating with the application of recycled excavated surplus soils, the sequentially extracted fractions of major and toxic elements were analyzed and compared to the results of the simple batch leaching test. The concentrations of bulk B and Pb of the Holocene marine clay layer Ma13 were the maximum 75 ppm and 28 ppm at the middle depth and varied similar to the change of clay fraction, while the bulk As concentration was the maximum 12 ppm at the upper part of the Ma13. The B adsorbed onto the clay minerals was easily desorbed under the neutral pH condition. Arsenic was released especially from the transitional sandy silt layers at the upper and lower parts of Ma13 where contacting with oxic groundwater. The 0.45-µm filter required by Japanese regulations does not efficiently remove colloidal particles resulting in poor reproducibility of batch leaching tests, especially for Pb. Also, relative indices of metal mobility suggest that the long-term risk of groundwater contamination via the reuse of excavated surplus soils will not be accurately estimated only by the simple batch leaching test. The change of redox and pH conditions associating with relocation and preservation must be considered to fully evaluate the risk of toxic element mobilization of the excavated surplus soils. |
| تدمد: | 1866-6299 1866-6280 |
| DOI: | 10.1007/s12665-019-8595-3 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7bfd20f4dbaa3dcb6e34efae808a3e2b https://doi.org/10.1007/s12665-019-8595-3 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....7bfd20f4dbaa3dcb6e34efae808a3e2b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18666299 18666280 |
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| DOI: | 10.1007/s12665-019-8595-3 |