Determination of the δ13C of dissolved inorganic carbon in water; RSIL lab code 1710
Techniques and Methods
10-c18
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Abstract
The purpose of the Reston Stable Isotope Laboratory (RSIL) lab code 1710 is to present a method to determine the δ13C of dissolved inorganic carbon (DIC) of water. The DIC of water is precipitated using ammoniacal strontium chloride (SrCl2) solution to form strontium carbonate (SrCO3). The δ13C is analyzed by reacting SrCO3 with 100-percent phosphoric acid (H3PO4) to liberate carbon quantitatively as carbon dioxide (CO2), which is collected, purified by vacuum sublimation, and analyzed by dual inlet isotope-ratio mass spectrometry (DI-IRMS). The DI-IRMS is a DuPont double-focusing mass spectrometer. One ion beam passes through a slit in a forward collector and is collected in the rear collector. The other measurable ion beams are collected in the front collector. By changing the ion-accelerating voltage under computer control, the instrument is capable of measuring mass/charge (m/z) 45 or 46 in the rear collector and m/z 44 and 46 or 44 and 45, respectively, in the front collector. The ion beams from these m/z values are as follows: m/z 44 = CO2 = 12C16O16O, m/z 45 = CO2 = 13C16O16O primarily, and m/z 46 = CO2 = 12C16O18O primarily. The data acquisition and control software calculates δ13C values.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Determination of the δ13C of dissolved inorganic carbon in water; RSIL lab code 1710 |
| Series title | Techniques and Methods |
| Series number | 10-c18 |
| DOI | 10.3133/tm10C18 |
| Year Published | 2012 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Reston Stable Isotope Laboratory |
| Description | viii, 12 p.; Appendices; Chapter 18, Section C |
| Larger Work Type | Book |
| Larger Work Subtype | Other Government Series |
| Larger Work Title | Chapter 18 of Section C, Stable Isotope-Ratio Methods, Book 10, Methods of the Reston Stable Isotope Laboratory |
| First page | i |
| Last page | 28 |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |