Carbon isotope analysis of dissolved organic carbon in fresh and saline (NaCl) water via continuous flow cavity ring-down spectroscopy following wet chemical oxidation
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Abstract
This work examines the performance and limitations of a wet chemical oxidation carbon analyser interfaced with a cavity ring-down spectrometer (WCO-CRDS) in a continuous flow (CF) configuration for measuring δ13C of dissolved organic carbon (δ13C-DOC) in natural water samples. Low-chloride matrix (<5 g Cl/L) DOC solutions were analysed with as little as 2.5 mg C/L in a 9 mL aliquot with a precision of 0.5 ‰. In high-chloride matrix (10–100 g Cl/L) DOC solutions, bias towards lighter δ13C-DOC was observed because of incomplete oxidation despite using high-concentration oxidant, extended reaction time, or post-wet chemical oxidation gas-phase combustion. However, through a combination of dilution, chloride removal, and increasing the oxidant:sample ratio, high-salinity samples with sufficient DOC (>22.5 µg C/aliquot) may be analysed. The WCO-CRDS approach requires more total carbon (µg C/aliquot) than conventional CF-isotope ratio mass spectrometer, but is nonetheless applicable to a wide range of DOC concentration and water types, including brackish water, produced water, and basinal brines.
Suggested Citation
Conaway, C.H., Thomas, R.B., Saad, N., Thordsen, J., Kharaka, Y.K., 2015, Carbon isotope analysis of dissolved organic carbon in fresh and saline (NaCl) water via continuous flow cavity ring-down spectroscopy following wet chemical oxidation: Isotopes in Environmental and Health Studies, v. 51, no. 2, p. 344-358, https://doi.org/10.1080/10256016.2015.1009910.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Carbon isotope analysis of dissolved organic carbon in fresh and saline (NaCl) water via continuous flow cavity ring-down spectroscopy following wet chemical oxidation |
| Series title | Isotopes in Environmental and Health Studies |
| DOI | 10.1080/10256016.2015.1009910 |
| Volume | 51 |
| Issue | 2 |
| Publication Date | February 17, 2015 |
| Year Published | 2015 |
| Language | English |
| Publisher | Taylor and Francis |
| Contributing office(s) | National Research Program - Western Branch |
| Description | 15 p. |
| First page | 344 |
| Last page | 358 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |