Japan Geoscience Union Meeting 2014

Presentation information

Print

Oral

Symbol U (Union) » Union

[U-05_30PM2] Interrelation between Life, Water, Mineral, and Atmosphere

Wed. Apr 30, 2014 4:15 PM - 5:45 PM 419 (4F)

Convener:*Tsubasa Otake(Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University), Yohey Suzuki(Graduate School of Science, The University of Tokyo), Fumito Shiraishi(Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University), Ken Takai(Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology), Yuichiro Ueno(Department of Earth and Planetary Sciences, Tokyo Institute of Technology), Takeshi Naganuma(Graduate School of Biosphere Science), Takeshi Kakegawa(Graduate School of Science, Tohoku University), Tadashi Yokoyama(Department of Earth and Space Science, Graduate School of Science, Osaka University), Kentaro Nakamura(Precambrian Ecosystem Laboratory (PEL), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)), Chair:Yohey Suzuki(Graduate School of Science, The University of Tokyo), Takeshi Naganuma(Graduate School of Biosphere Science)

5:00 PM - 5:15 PM

[U05-19] Adsorption behavior of organoarsenic compounds in soils

*Masato TANAKA1, Yoshio TAKAHASHI1 (1.Graduate School of Science, Hiroshima University)

Keywords:soil, adsorption, XAFS, organoarsenic

The arsenic pollution is a world problem. Natural originated inorganic arsenic compounds are predominant cause of the water-related disease. In addition, anthropogenic originated organoarsenic compounds such as phenylarsonic acid (PAA) and diphenylarsinic acid (DPAA) are also pollution source. For example, DPAA polluted well water caused serious health problems in Kamisu, Japan [1]. These phenyl arsenic compounds are considered as a decomposition product of chemical warfare agents produced during World Wars I and II, and even now such compounds still remain in the ground [2]. Recently, adsorption and mobility of these aromatic arsenic compounds in agricultural soils have been investigated [3]. However, their adsorption mechanisms on soil are still unknown. In general, the adsorption property of chemical compounds influences its migration process in natural environments such as soil-water system. Thus, it is important to understand the adsorption mechanism of the arsenic compounds to predict future fate of them in environment. Recently, we reported adsorption structures of PAA and DPAA on ferrihydrite obtained by X-ray absorption fine structure (XAFS) analysis and quantum chemical calculations [4]. In this study, we conducted As K-edge XAFS measurements for organoarsenic compounds adsorbed on soil, as well as a sequential extraction, to understand their adsorption behavior in the soil. EXAFS analysis suggests that all arsenic compounds in this study adsorbed on Fe or Al (oxyhydr)oxide in the soil mainly regardless of the organic functional groups. This fact indicates that the Fe/Al (oxyhydr)oxide can control the mobility of organorasenic compounds in the ground.References:[1] Hanaoka S, Nagasawa E, Nomura K, Yamazawa M and Ishizaki M 2005 Appl. Organometal. Chem. 19 265.[2] Wang A, Li S, Teng Y, Liu W, Wu L, Zhang H, Huang Y, Luo Y and Christie P 2013 J. Environ. Sci. 25 1172.[3] Maejima Y, Murano H, Iwafune T, Arao T and Baba K 2011 Soil Sci. Plant Nutr. 57 429.[4] Tanaka M, Togo Y S, Yamaguchi N and Takahashi Y 2014 J Colloid Interface Sci., 415, 13.