Japan Geoscience Union Meeting 2016

Presentation information


Symbol H (Human Geosciences) » H-TT Technology & Techniques

[H-TT21] Development and applications of environmental traceability methods

Tue. May 24, 2016 3:30 PM - 5:00 PM 101A (1F)

Convener:*Ichiro Tayasu(Research Institute for Humanity and Nature), Takanori Nakano(Research Institute for Humanity and Nature, Inter-University Research Institute Corporation National Institutes for the Humanities), Chair:Keisuke Koba(Center for Ecological Research, Kyoto University)

4:45 PM - 5:00 PM

[HTT21-18] Usefulness of strontium isotope composition for determining the geographical origin of Japanese horseradish (Wasabia japonica) (II)

★Invited papers

*Takafumi Kamitani1, Sachiko Nakamura1, Akira Ito1, Sayaka Ogo1, Takuya Nishijima2, Ki-Cheol Shin3, Yasuhide Muranaka1 (1.Shizuoka Institute of Environment and Hygiene, 2.Shizuoka Prefectural Research Institute of Agriculture and Forestry, 3.Research Institute for Humanity and Nature)

Keywords:discrimination of the geographic origin, Japanese horseradish (Wasabia japonica), trace element, strontium isotopic ratio, Shizuoka Prefecture

Originally, the use of strontium isotope ratios (87Sr/86Sr) was restricted to geology and petrology, but they have been used as a particularly effective tracer of geographical food origin, as plants reflect the strontium isotope composition of the regionally based rock, soil, and water.
Japanese horseradish (Wasabia japonica) is cultivated in springs and streams located at the top of rivers, where dissolved element and isotopic compositions would reflect the geological characteristics with the exception of effects of atmospheric deposition and human activity. This study aims to evaluate the usefulness of 87Sr/86Sr for determining the geographical origin of Japanese horseradish.
We collected 97 horseradish samples and 95 water samples from 34 locations of major production areas in Japan: Shizuoka, Iwate, Nagano, Tokyo, and Shimane. These samples were subjected to trace elements and 87Sr/86Sr analyses. The 87Sr/86Sr values differed, based on the geological characteristics of their site locations, and the value of horseradish sample was well accorded with that of water sample in the same location. The horseradishes collected from Izu and Fuji regions in Shizuoka, where young volcanic rocks such as Quaternary basalts are distributed, had low 87Sr/86Sr (below 0.7040), whereas those from Nagano and Tokyo, where older rocks such as Mesozoic granites and accretionary complex are distributed, showed higher ratios (over 0.7095). We conclude that 87Sr/86Sr value of the horseradish allowed us to distinguish the production area clearly.