- P-ISSN 1225-0163
- E-ISSN 2288-8985
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- P-ISSN1225-0163
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A Study on the Quantitative Recovery of Dissolved Inorganic Carbonates in Ground Water for Radiocarbon Measurement
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1999, v.12 no.4, pp.284-289
Chun,
S., Woo,
H., Cho,
S., Kim,
N., &
Lee,
J.
(1999). A Study on the Quantitative Recovery of Dissolved Inorganic Carbonates in Ground Water for Radiocarbon Measurement. Analytical Science and Technology, 12(4), 284-289.
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Abstract
Dissolved inorganic carbonates in ground water were quantitatively recovered by using gas evolution method. Gas evolution method was found to be less time-consuming, less susceptible to the contamination fromatmospheric <TEX>$CO_2$</TEX> and little affected by the sulfate ions in comparison to the direct precipitation method. Extraction efficiency of nearly 99% could be achieved by gas evolution method in two hours using recirculated gas at a sweeping rate of 4 liter per minute. Samples for carbon isotope fractionation study were collected in three fractions with collection times. The evolution time for the first fraction was one hours, and then second and third fractions were collected at intervals of 30 minutes, respectively. A small portion of each fraction was analyzed to evaluate <TEX>${\delta}^{13}C$</TEX> values, which were measured to be -7.9‰, -3.0‰ and +0,4‰ for the each fraction. The result clearly indicated that gas evolution method generates isotopically lighter carbon at the beginning of the purging process and heavier isotopes at the end. However, this isotope fractionation effect could be neglected by the almost complete recovery of carbonates.
- keywords
- ground water, gas evolution method, isotope fractionation, radiocarbon
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