Revised Sampling Procedure for Determination of Dissolved Gases in Solution by Gas Chromatography.

Swinnerton, J. W.; Linnenbom, V. J.; Cheek, C. H.

doi:10.1021/ac60191a047

Cited by 50 publications

(10 citation statements)

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“…Glass syringes containing pore waters or Niskin water were analyzed for TCO 2 by injecting a calibrated volume into a Swinnerton stripper (Swinnerton et al, 1962), adding acid, and measuring CO 2 with a Coulemetrics Coulometer. Sample sizes were either 0.917 mL or 2.185 mL, and replicate bottom waters yielded a precision of analysis of 0.5%.…”

Section: Methodsmentioning

confidence: 99%

Anaerobic diagenesis of silica and carbon in continental margin sediments: Discrete zones of TCO2 production

Berelson¹,

Prokopenko²,

Sansone³

et al. 2005

Geochimica et Cosmochimica Acta

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Pore water profiles of dissolved Si, Ca 2ϩ , SO 4 2-, CH 4 , and TCO 2 (Dissolved Inorganic Carbon; DIC) were determined from multicores and gravity cores collected at nine sites off Southern California, the west coast of Mexico, and within the Gulf of California. These sites were located within the eastern North Pacific oxygen minimum zone at depths of 400 to 900 m and in settings where bottom water oxygen concentrations were Ͻ3 M and sediments were laminated. Pore water profiles were defined at a resolution of millimeters (whole core squeezing), centimeters (sectioning and squeezing) and meters (gravity core sectioning and squeezing), and diffusive fluxes were calculated for different zones within the sediment column. The flux of dissolved silica across the sediment-water interface (SWI) ranged from 0.3 to 3.4 mmol Si m -2 d -1 , and TCO 2 fluxes ranged from 0.8 to 4.6 mmol C m -2 d -1 . A positive correlation (r ϭ 0.74) existed between these fluxes, yet these two constituents exhibited significantly different diagenetic behavior downcore; dissolved Si generally reached a constant concentration (between 450 and 900 M) in the upper few cm, whereas TCO 2 concentrations increased monotonically with depth.Methane was detected at micromolar levels in sediment intervals between 0 and 60 cm and at five sites, increased to millimolar levels at depths of 80 to 170 cm. At the horizon marking the appearance of millimolar levels of methane, there was a distinct change in slope of the sulfate and TCO 2 gradients. A flux budget for this horizon was determined by using linear fits to pore water profiles; these budgets indicate that the upward TCO 2 flux away from this horizon is 40 to 50% greater than the downward sulfate flux to this horizon. Given that the TCO 2 flux to this horizon from below was quite small, this imbalance suggests that anaerobic oxidation of methane by sulfate is not the only process producing TCO 2 within this horizon. A budget for TCO 2 at this horizon is balanced when 40 to 80% of the sulfate flux is attributed to organic carbon remineralization. Of the DIC that diffuses across the SWI, 20 to 40% is generated by reactions occurring within or below this deep reaction horizon.

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Section: Methodsmentioning

confidence: 99%

Anaerobic diagenesis of silica and carbon in continental margin sediments: Discrete zones of TCO2 production

Berelson¹,

Prokopenko²,

Sansone³

et al. 2005

Geochimica et Cosmochimica Acta

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“…A modification 43 of the stripping method eliminated the traps and used carrier gas (He) to quantitatively strip gases directly from liquid samples into a gas chromatograph. A further modification 44 involving use of a sampling valve to ensure uniform liquid sample sizes led to wide application. Central to these modifications was use of a 1 cm diameter stripping chamber equipped with a coarse glass frit.…”

Section: Water Columnmentioning

confidence: 99%

Oceanic Methane Biogeochemistry

2007

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from 1968 until 1993, when he joined the University of California Irvine as one of the founding faculty of the Program in Geosciences, now the Department of Earth System Science. He was editor of Global Biogeochemical Cycles from 1998 to 2004 and was elected AGU Fellow in 2001. His research focus has been on methane geochemistry, particularly documenting the occurrence and extent of anaerobic oxidation of methane, and recent measurements of natural stable isotopes ( 2 H-CH 4 , 13 C-CH 4 ) and radiocarbon ( 14 C-CH 4 ) in methane from anoxic marine sediments and waters.

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“…The methods based on extraction from the headspace are an elegant choice (Swinnerton et al, 1962). The more often used procedures are the so called "purge and trap" techniques Servili et al, 1995; in which the compounds of interest are trapped in a suitable adsorbent, from which they can be taken either directly (using a special "thermal desorber" injector) or after retro-extraction into a suitable solvent which, once again, includes an extra extraction step.…”

Section: Sample Preparation Proceduresmentioning

confidence: 99%

Olive Oil Composition: Volatile Compounds

Silva¹,

Freitas²,

Cabrita³

et al. 2012

Olive Oil - Constituents, Quality, Health Properties and Bioconversions

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The health-promoting effects attributed to olive oil, and the development of the olive oil industry have intensified the quest for new information, stimulating wide areas of research. This book is a source of recently accumulated information. It covers a broad range of topics from chemistry, technology, and quality assessment, to bioavailability and function of important molecules, recovery of bioactive compounds, preparation of olive oil-based functional products, and identification of novel pharmacological targets for the prevention and treatment of certain diseases.

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Revised Sampling Procedure for Determination of Dissolved Gases in Solution by Gas Chromatography.

Cited by 50 publications

References 0 publications

Anaerobic diagenesis of silica and carbon in continental margin sediments: Discrete zones of TCO2 production

Anaerobic diagenesis of silica and carbon in continental margin sediments: Discrete zones of TCO2 production

Oceanic Methane Biogeochemistry

Olive Oil Composition: Volatile Compounds

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