Comparison of methane concentration and stable carbon isotope data for natural samples analyzed by discrete sample introduction module - cavity ring down spectroscopy (DSIM-CRDS) and traditional methods
Description
A discrete sample introduction module (DSIM) was developed and interfaced to a cavity ring-down spectrometer to enable measurements of methane and CO2 concentrations and 13C values with a commercially available cavity ring-down spectrometer (CRDS). The DSIM-CRDS system permits the analysis of limited volume (5 - 100-ml) samples ranging six orders-of-magnitude from 100% analyte to the lower limit of instrument detection (2 ppm). We demonstrate system performance for methane by comparing concentrations and 13C results obtained by the DSIM and traditional methods for a variety of sample types, including low concentration (nanomolar) seawater and high concentration (> 90%) natural gas. The expansive concentration range the CRDS is able to analyze while being packaged in a field-portable analytical system greatly enhances functionality for investigating methane and CO2 dynamics, as well as other gases measured by laser absorption spectroscopy.
Resources
| Name |
Format |
Description |
Link |
|
55 |
The metadata original format |
https://data.usgs.gov/datacatalog/metadata/USGS.60d60d72d34e960393674818.xml |
|
55 |
Landing page for access to the data |
https://doi.org/10.5066/P99B34V1 |
Tags
- environment
- northern-u-s-atlantic-margin
- oceans
- temperate-northern-pacific
- ocean-characteristics
- u-s-geological-survey
- oceanography
- cavity-ring-down-spectroscopy
- carbon-isotope-analysis
- carbon-dioxide
- gas-hydrate-resources
- sediment-geochemistry
- geochemistry
- carbon-cycling
- carbon-cycle
- methane-hydrate
- usgs-60d60d72d34e960393674818
- biogeochemistry
- isotope-geochemistry
- usgs
- northern-cascadia-margin
- marine-chemistry
- methane
- geochemical-data
- stable-isotopes
- temperate-northern-atlantic
- eastern-continental-margin-of-india