In:
Radiocarbon, Cambridge University Press (CUP), Vol. 25, No. 2 ( 1983), p. 511-518
Abstract:
The extraction of dissolved carbonate species for age dating from a 100L water sample by the direct-precipitation method (DPM) and by the gas-evolution method (GEM) has been investigated. Stable carbon-isotope fractionation between initial and final carbon dioxide evolved was ca 11‰ by GEM and 1‰ by DPM. GEM will produce isotopically lighter carbon dioxide compared with DPM if carbonate recovery is low. Extraction efficiency of 〉 95% can be achieved by GEM in 3 hours using nitrogen gas at a sweeping rate of 2000cc per minute. DPM requires precipitates to settle overnight to assure 〉 95% recovery. GEM is little affected by a high concentration of sulfate ions, whereas DPM is greatly affected by sulfate resulting in less yield.
Type of Medium:
Online Resource
ISSN:
0033-8222
,
1945-5755
DOI:
10.1017/S0033822200005804
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1983
detail.hit.zdb_id:
2028560-7
SSG:
11
SSG:
13
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