TY - JOUR
T1 - Distribution and Speciation of Bromine and Iodine in Volcanic Ash Soil Profiles
AU - Takeda, Akira
AU - Nakao, Atsushi
AU - Yamasaki, Shin ichi
AU - Tsuchiya, Noriyoshi
N1 - Funding Information:
XANES experiments at beamline BL14B2 at SPring-8 were performed under program no. 2014A1749. The authors are grateful to Dr. H. Ofuchi and Dr. T. Honma (Japan Synchrotron Radiation Research Inst.) for assistance with XANES analyses. The authors thank Dr. H. Kakiuchi (Inst. for Environmental Sciences) for his support with soil sampling and useful advice, and Ms. S. Uno (Kyoto Prefectural Univ.) for her help in soil analysis.
Publisher Copyright:
© Soil Science Society of America, 5585 Guilford Rd., Madison WI 53711 USA. All Rights reserved.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - Bromine and iodine are halogens with similar chemical properties. Distributions of Br and I in the soil profile provide insights for understanding of their biogeochemical cycles and fate of these elements derived from artificial origin. Although generally not abundant in parent rock materials, they are often found in higher concentrations in soils, particularly volcanic ash soils in Japan. However, the process of Br and I accumulation in soils during soil formation remains unclear. We investigated the vertical distribution of Br and I to characterize the processes of Br and I accumulation in volcanic ash soils. Soils were collected from three pedons in the southern Shimokita Peninsula, Japan. Bromine (1.4 to 253 mg kg–1) and iodine concentrations (1.2 to 90 mg kg–1) in the soils were significantly correlated. nondestructive speciation analysis by X-ray absorption near edge structure spectroscopy showed that both Br and I mainly exist in their organic forms in soils enriched in those elements. Indices of the degree of Andosol formation (oxalate-extractable Al and fe, pyrophosphate-extractable Al and fe, phosphate absorption coefficient, and soil pH [naf]) were significantly correlated with both Br and I concentrations in the soils. These results suggest that Br and I, derived from atmospheric deposition, were retained in surface soils after transformation to organic form and accumulated during Andosol formation from their parent tephra deposits.
AB - Bromine and iodine are halogens with similar chemical properties. Distributions of Br and I in the soil profile provide insights for understanding of their biogeochemical cycles and fate of these elements derived from artificial origin. Although generally not abundant in parent rock materials, they are often found in higher concentrations in soils, particularly volcanic ash soils in Japan. However, the process of Br and I accumulation in soils during soil formation remains unclear. We investigated the vertical distribution of Br and I to characterize the processes of Br and I accumulation in volcanic ash soils. Soils were collected from three pedons in the southern Shimokita Peninsula, Japan. Bromine (1.4 to 253 mg kg–1) and iodine concentrations (1.2 to 90 mg kg–1) in the soils were significantly correlated. nondestructive speciation analysis by X-ray absorption near edge structure spectroscopy showed that both Br and I mainly exist in their organic forms in soils enriched in those elements. Indices of the degree of Andosol formation (oxalate-extractable Al and fe, pyrophosphate-extractable Al and fe, phosphate absorption coefficient, and soil pH [naf]) were significantly correlated with both Br and I concentrations in the soils. These results suggest that Br and I, derived from atmospheric deposition, were retained in surface soils after transformation to organic form and accumulated during Andosol formation from their parent tephra deposits.
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U2 - 10.2136/sssaj2018.01.0019
DO - 10.2136/sssaj2018.01.0019
M3 - Article
AN - SCOPUS:85051198900
VL - 82
SP - 815
EP - 825
JO - Soil Science Society of America Journal
JF - Soil Science Society of America Journal
SN - 0361-5995
IS - 4
ER -