Nakao, Atsushi et al. (2019) Asian dust increases radiocesium retention ability of serpentine soils in Japan, Journal of Environmental Radioactivity, 204, 86-94, doi: 10.1016/j.jenvrad.2019.03.028. < 20200319155438-428602 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Radiocesium (RCs) is selectively adsorbed on interlayer sites of weathered micaceous minerals, which can reduce the mobility of RCs in soil. Therefore, soils developed from mica-deficient materials (e.g. serpentine soils) may have a higher risk of soil-to-plant transfer of RCs. Soils were collected from three serpentine soil profiles; Udepts in Oeyama, Japan, and Udepts and Udox in Kinabalu, Malaysia. Soil was sampled every 3 cm from 0 to 30 cm depth and sieved to isolate soil particles of ≤20 μm diameter for the assessment of radiocesium interception potential (RIP) after a series of pretreatments. One subset was treated with H2O2 to remove organic matter (OM). Another subset was further treated with hot sodium citrate to remove hydroxy-Al polymers (Al(OH)x). RIPuntreated was −1 whereas mica-K content was −1 and mica-K content of 0.72% by weight for the ≤20-μm particles. Furthermore, the RIP value was significantly increased to an average of 22.5 mol kg−1 after removing both OM and Al(OH)x. These results strongly suggest that weathered micaceous minerals primarily control the ability to retain RCs. These micaceous minerals cannot originate from serpentine minerals, and are probably incorporated as an exotic material, such as Asian dust. This hypothesis is supported by the δ18O value of quartz isolated from the ≤20-μm soil particles from Oeyama, Japan (+16.13‰±0.11‰), very similar to that of Asian dust. In conclusion, serpentine soils in Japan may exhibit a reduced risk of soil-to-plant transfer of RCs due to the historical deposition of Asian dust.

  • doi: 10.1016/j.jenvrad.2019.03.028
  • modified at 9 h ago


(a) IRMS with LF on SIRA Thermo-Fisher MAT253
KB1700U < 20200323153347-912470 >pub
  • place: N6°1′60.0″, E116°37′0.0″ more
  • classification: sedimentary
  • physical-form: aliquot
  • status: (unknown)
  • description: Soil sample from southern slope of Mt. Kinabalu in north-eastern Borneo, Malaysia
  • modified at 2020-03-24
OY < 20200323153320-621200 >pub
  • place: N35°28′0.0″, E135°7′60.0″ more
  • classification: sedimentary
  • physical-form: aliquot
  • status: (unknown)
  • description: Soil sample from Mt.Oeyama in Kyoto, Japan
  • modified at 2020-03-24
KB700U < 20200323153332-865257 >pub
  • place: N6°5′60.0″, E116°42′0.0″ more
  • classification: sedimentary
  • physical-form: aliquot
  • status: (unknown)
  • description: Soil sample from eastern slope of Mt. Kinabalu in north-eastern Borneo, Malaysia
  • modified at 2020-03-24
name box-type global-id
binder of selected IPM publications 1 pub container 20200319102651-400217
name latitude longitude global-id
locality of KB700U pub 6.1000 N 116.7000 E 20200323154157-128468
locality of OY pub 35.4667 N 135.1333 E 20200323153818-680533
locality of KB1700U pub 6.0333 N 116.6167 E 20200323154406-044337
name device size global-id
KB1700U pub SIRA Thermo-Fisher MAT253 1 20200323155752-008303
OY-d18O pub SIRA Thermo-Fisher MAT253 1 20200323155530-429783
KB700U-d18O pub SIRA Thermo-Fisher MAT253 1 20200323155703-790318
name spots global-id
caption ID assembly stone
d18O value in rock sample collected from OY, KB700U and KB1700U sites pub 20200323155255-189815 oxygen (d18O) 3
manual
  • name
  • Nakao, Atsushi
  • Tomita, Mayu
  • Wagai, Rota
  • Tanaka, Ryoji
  • Yanai, Junta
  • Kosaki, Takashi