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Journal Articles

Fluxes and balance of $$^{210}$$Pb in the northwestern Japan Sea

Otosaka, Shigeyoshi; Baba, Masami*; Togawa, Orihiko; Karasev, E. V.*

Pacific Oceanography, 1(2), p.149 - 157, 2003/12

A sediment trap experiment and sediment coring were carried out in the northwestern Japan Sea (Sta MS), and lead-210 ($$^{210}$$Pb) and major components in settling particles were measured. By drawing up a balance of $$^{210}$$Pb in the water column, it was estimated that the cycle of $$^{210}$$Pb in the Sta MS was controlled by 3 processes, (1) removal and vertical transport of $$^{210}$$Pb from the surface layer by settling particles, (2) decomposition of particles in the deep layer, and (3) export by the deep current. Flux of $$^{210}$$Pb at 3 km depth was large in winter and spring. The large $$^{210}$$Pb flux in this season would be caused by the horizontal import of $$^{210}$$Pb -rich seawater from the coastal region to the bottom layer of Sta MS. It was suggested that seasonal variation of particulate $$^{210}$$Pb flux at the deep layer in the northwestern Japan Basin indicated the renewal of the deep water in this area.

JAEA Reports

Development of one-dimensional atmosphere-bare soil model

Yamazawa, Hiromi; Nagai, Haruyasu

JAERI-Data/Code 97-041, 56 Pages, 1997/10

JAERI-Data-Code-97-041.pdf:1.32MB

no abstracts in English

Oral presentation

Analysis of rare earth elements in natural water samples by Chelate resin

Watanabe, Takahiro; Kokubu, Yoko; Murakami, Hiroaki; Iwatsuki, Teruki

no journal, , 

REEs (Rare Earth Elements) pattern in geological and natural water samples possibly provides changes in past redox condition and sources of materials. However, quantitative analysis of REEs in these samples has been difficult because of those relative low content and mass interference for ICP-MS analyses. In this study, we improved pre- concentration and separation methods of the REEs using Chelate resin (Nobias Chelate PA1, Hitachi High Technologies). The authentic materials and natural water samples were used for evaluation of these methods. REEs and other elements concentrations were measured by ICP-MS (Agilent 7700). Recovery rates of REEs, U and Mo were more than 90% in this study. Additionally, more than 99% of Ba, As and Sr were removed. For the natural samples (spring water), the REEs pattern obtained from the Chelate resin method was good agreement with that of previous method (interference calibration method).

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