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[SRD33-15] Source of iodine in the groundwater of Hokkaido inferred by ratios of halogens.
Keywords:Iodine, Groundwater, Hokkaido
In this study, we analyzed I, bromine (Br) and chlorine (Cl) in high concentration I groundwater (> 1 mg/L) corrected from hot springs and borehole in Hokkaido to investigate the I concentration mechanism. Their groundwater samples were grouped into two assemblages by elemental enrichment patterns; one of them has higher I/Cl and Br/Cl ratios than those of sea water (group-1), and the other is concentrated only I compare to sea water (group-2). As the result of calculating I/Br ratio except for influence of sea and meteoric water to identify source of I, the I/Br ratio of group-1 and -2 shows comparable in those of sea surface sediment and sea plants, respectively. In the future, iodine source is discussed in the more detail by comparing the I/Br ratio between groundwater and the surrounding sedimentary rock.
Aramaki N et al. (2015) Current Challenges and Future Prospects of Bio-methane Production Engineering in Subsurface Environment in Northern Hokkaido -Proposal of Subsurface Cultivation and Gasification -. Journal of MMIJ 131: 285-292.