Changes in 14C activity over time during vacuum distillation of carbon from rock pore water

被引：0
|
作者：
Davidson, GR
Yang, IC
机构：
[1] Univ Mississippi, Dept Geol & Geol Engn, University, MS 38677 USA
[2] US Geol Survey, Lakewood, CO 80225 USA
来源：
RADIOCARBON | 1999年 / 41卷 / 02期
关键词：
D O I：
10.1017/S0033822200019494
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The radiocarbon activity of carbon collected by vacuum distillation from a single partially saturated tuff began to decline after approximately 60% of the water and carbon had been extracted. Disproportionate changes in C-14 activity and delta(13)C during distillation rule out simple isotopic fractionation as a causative explanation. Additional phenomena such as matrix diffusion and ion exclusion in micropores may play a role in altering the isotopic value of extracted carbon, but neither can fully account for the observed changes. The most plausible explanation is that distillation recovers carbon from an adsorbed phase that is depleted in C-14 relative to DIC in the bulk pore water.
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收藏
页码：141 / 148
页数：8
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