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A simple automated continuous-flow-equilibration method for measuring carbon monoxide in seawater
1Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Massachusetts 02543, USA.
Environmental Science & Technology
|May 12, 2001
Summary
A new automated method precisely measures carbon monoxide (CO) in natural waters using air-segmented continuous-flow equilibration. This robust system offers accurate CO measurements for environmental monitoring.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Oceanography
Background:
- Accurate measurement of carbon monoxide (CO) in natural waters is crucial for understanding marine biogeochemical cycles.
- Existing methods for CO analysis in aquatic environments can be complex and time-consuming.
Purpose of the Study:
- To develop and automate a simple, robust, and low-maintenance method for precise and accurate measurement of CO in natural waters.
- To establish a model for optimizing the performance of the CO extraction system.
Main Methods:
- Air-segmented continuous-flow equilibration was employed, forming discrete gas/liquid segments.
- CO-free air and water samples were precisely regulated and pumped through a glass coil.
- A semiempirical mass-balance model was used to predict and optimize system performance.
Main Results:
- The automated system achieved a response time of less than 15 minutes and an 80% CO-extraction yield.
- Analytical blank was 0.02 nM, precision was ±2.5% at the 1 nM level, and accuracy was better than 5%.
- The system was successfully applied to monitor diurnal CO variations in Sargasso Sea surface waters.
Conclusions:
- The developed method provides a precise, accurate, and efficient means for measuring CO in natural waters.
- The automated system is suitable for continuous monitoring and environmental studies.
- This technique enhances our ability to study marine carbon cycling and variability.