An intercomparison of small- and large-volume techniques for thorium-234 in seawater

被引:114
作者
Buesseler, KO [1 ]
Benitez-Nelson, C
van der Loeff, MR
Andrews, J
Ball, L
Crossin, G
Charette, MA
机构
[1] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem MS25, Woods Hole, MA 02543 USA
[2] Univ Hawaii, Dept Oceanog, Honolulu, HI 96822 USA
[3] Alfred Wegener Inst, D-27515 Bremerhaven, Germany
[4] Univ British Columbia, Dept Forest Sci, Vancouver, BC V6T 1Z4, Canada
基金
美国国家科学基金会;
关键词
thorium-234; radiochemistry; beta counting;
D O I
10.1016/S0304-4203(00)00092-X
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this paper, an intercomparison of methods for the determination of Th-234 in seawater is discussed. Samples were collected either from a shore-based 600 m water source, or from standard bottle casts in deep waters off Hawaii and the Southern Ocean. We compared large-volume techniques, which rely upon Mn cartridges for the collection of dissolved Th-234 and its detection via gamma counting (> 200-1 samples), with small volume methods that employed either direct beta counting, or beta counting after radiochemical purification (2-20-1 samples). Unique to this study is the presentation of small volume (2 and 5 l) Th-234 methods. This new technique is an adaptation of 20-1 methods that are based on the coprecipitation of thorium with Mn oxides followed by direct, beta counting of the precipitate. The small volume Mn coprecipitation methods were found to be superior to other methods due to ease of sample collection, processing and low overall analytical uncertainties, (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:15 / 28
页数:14
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