Year: 1997
Type: article
Abstract: A high‐accuracy, batch‐equilibration, static‐headspace technique for the determination of the fugacity of CO2 (fCO2) in discrete water samples is described. The technique was designed for monitoring small changes of CO2 in the ocean and has accuracy and precision (<1% for water samples) comparable to that of the best techniques available. The method uses several novel approaches to maximize accuracy, requires only a small water sample (60 ml), and is very rapid (~2 min per analysis). Precision of the calculated total alkalinity, based on the measured fCO2 and CT, is comparable to or better than is generally attained using potentiometric titration. Compared with CT and total alkalinity measurements, the small sample volume and rapid analysis time makes it practical to perform analysis of multiple replicates in order to improve confidence in the result. The method is readily applicable to experimental studies such as incubations as well as to time‐series measurements of in situ biological metabolism. Because the analysis employsgas chromatography, the technique can be acapted to measure simultaneously a suite of gases dissolved in seawater.
Source: Limnology and Oceanography
Institution: Brookhaven National Laboratory
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Climate action
Open Access status: bronze
OpenAlex ID: W1965577863