Year: 1998
Type: article
Abstract: A high-accuracy, batch-equilibration, static-headspace technique for the determination of the fugacity of CO, (fC0,) in discrete water samples is described.The technique was designed for monitoring small changes of CO, 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 fC0, and C,, is comparable to or better than is generally attained using potentiometric titration.Compared with C,. 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 employs gas chromatography, the technique can be acapted to mcasurc simultaneously a suile of gases dissolved in seawater.technique.Dave Chipman and co-workers kindly offered to intercalibrate our jC0, standards with primary standards maintained at Lamont-Doherty Earth Observatory.Much of the early experience with this technique was thanks to the efforts of Bob Ramirez and Rick Wilke.
Authors: Neill, Craig, Johnson, Kenneth M., Lewis, Ernie, Wallace, Douglas W.R.
Institution: Brookhaven National Laboratory
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
Award: G969889393
OpenAlex ID: W2525122101