Aqueous Dissolved Gas Measurements Using Near-Infrared Raman Spectroscopy

Berger, Andrew J.; Wei, Xiawei; Sammeth, David M.; Itzkan, Irving; Kneipp, Katrin; Feld, Michael S.

doi:10.1366/0003702953965047

Cited by 41 publications

(35 citation statements)

References 9 publications

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“…The Raman spectrum of CO 2 , in turn, is a moderately accurate monitor of its density, [22][23][24][25][26][27][28][29][30] and Raman spectroscopy can be used to determine the concentration and speciation (e.g., into CO 3 2Ϫ and HCO 3 Ϫ ) of CO 2 dissolved in water. [31][32][33] Our laboratory work 22 and that of others has shown that, as CO 2 density increases, the Raman band positions of both bands of the Fermi diad 34 downshift, whereas the spectral separation increases between these two bands. 23,25,26 We used the equation of state of Span and Wagner 35 as implemented with the program CO2Tab from ChemicaLogic Corporation 36 to calculate the density of the CO 2 in our previous laboratory experiments 22 and in the ocean experiment.…”

Section: Fig 6 Comparison Of the Raman Spectra Of Deionized Water (mentioning

confidence: 83%

“…However, direct Raman spectroscopic -2 -observation of HCO and CO in solution is possible, although acquisition of spectra in-situ is difficult due to low 33 concentrations in natural waters. We are attempting to address this problem using the DORISS instrument.…”

Section: Discussionmentioning

confidence: 99%

“…We are attempting to address this problem using the DORISS instrument. The first -2 -objective is to determine the Raman scattering efficiency of HCO and CO , and thereby define the instrument requirements 33 to enable direct determination of carbonate speciation in a ~2 mM TCO solution. The second step is to increase the 2 sensitivity of the system through improvements to the optical path and advanced post-processing techniques.…”

Section: Discussionmentioning

confidence: 99%

“…Raman spectroscopy is a promising potential technique for direct quantitative measurement of the oceanic carbonate system as it requires no sample preparation -2 -and can readily distinguish between HCO and CO 33 -2 -The Raman spectra of HCO and CO were first described by 33 Davies and Oliver (1972). They analyzed saturated solutions (~8 M) of KHCO and K CO , determined the molecular symmetry 32 3 -2 -of HCO and CO , and assigned the observed Raman active 33 bands to given vibrational modes.…”

Section: Raman Spectroscopy Is Based On the Weak Inelastic Scatteringmentioning

confidence: 99%

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Feasibility of Large-Scale Ocean Co2 Sequestration

Brewer¹,

Barry²

2004

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ABSTRACT:The past year has been one of continued high productivity and technical innovation for research conducted under support of this contract. We report here on the successful completion of development of a deep-ocean laser Raman spectrometer, and the use of this novel system for direct in situ measurement of the dissolution rate of CO 2 from a N 2 /CO 2 gas mixture at 300m ocean depth. We have carried out the deepest ever ocean CO 2 injection experiment at 3960m depth, and have observed the behavior of the plume of low pH/high CO 2 water emanating from this source. This was made possible by the design, construction, and operation of a novel flume to contain the liquid CO 2 and to force flow in a controlled manner over the liquid CO 2 surface. In carrying out this experiment we observed for the first time the extraordinarily rapid hydration kinetics of CO 2 with water at high pressure. This initial observation was later confirmed in a carefully controlled series of acid and CO 2 injection studies at varying depths. In carrying out this research we are aware of the environmental concerns, and we have been in the forefront of identifying the challenges resulting from the far greater quantities of CO 2 being passively absorbed from the atmosphere. This quantity now is approximately 1 million metric tons CO 2 per hour, and reasonable projections for the 21 st century project ocean pH changes of 0.3 or more by mid-century. The PIs have played a key role in organizing a major international meeting on this topic, and on reporting the results. We are now engaged in developing the novel techniques required to investigate this problem. INTRODUCTIONThe primary mechanism preventing very fast accumulation of CO 2 in the atmosphere is ocean absorption through the sea surface. This absorption, driven by the accumulated mean pCO 2 difference between air and sea, now proceeds at a rate of about 1 million metric tons CO 2 per hour. Thus ocean passive "disposal" of fossil fuel CO 2 is the primary greenhouse gas control technique used by all nations at all times, and the accumulated oceanic fossil fuel burden is now ≅ 500 billion tons CO 2 . In the few years that CO 2 is resident in the atmosphere it affects the planetary radiation balance and contributes to global warming. Thus some 25 years ago it was first suggested that direct injection of CO 2 into the deep ocean, thus bypassing the atmospheric disposal step with its attendant global warming, would be a useful greenhouse gas control technology. We have investigated this process in a series of studies carried out in part through the support of this award. These have involved creation of advanced experimental techniques for injection of CO 2 into the deep ocean, the measurement of the fate and behavior of the injected liquid, the formation and dissolution of a solid hydrate, and the environmental consequences of both direct and indirect CO 2 injection into the ocean. EXECUTIVE SUMMARYIn this report we detail research carried out in the period October 1, 2003 through Septemb...

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Section: Fig 6 Comparison Of the Raman Spectra Of Deionized Water (mentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Raman Spectroscopy Is Based On the Weak Inelastic Scatteringmentioning

confidence: 99%

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Feasibility of Large-Scale Ocean Co2 Sequestration

Brewer¹,

Barry²

2004

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“…[32][33][34] The first biological sample study was conducted on serum and whole blood samples from 69 patients over a seven-week period. 23 No sample processing or selection criteria were employed, with the exception of locating a few samples with extreme glucose concentrations to represent the range of diabetes patients' glucose levels.…”

Section: Unprocessed Samplesmentioning

confidence: 99%

Noninvasive Glucose Sensing with Raman Spectroscopy

Shih

Bechtel

Feld

2009

In Vivo Glucose Sensing

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Surface‐enhanced Raman scattering of CO₂ dissolved in aqueous colloidal solutions of silver and gold

Kneipp

Wang

Berger

et al. 1995

J Raman Spectroscopy

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The observation of surface-enhanced Raman scatterings (SERS) from CO, molecules dissolved in aqueous solutions of silver and gold colloids measured with 850 nm near-IR excitation is reported. Different types of surface enhancement and surface-enhanced Raman spectra were observed. The SERS spectrum of CO, on colloidal gold is in good agreement with the spectrum of COz dissolved in water. Two different types of SERS spectra were found for CO, on colloidal silver. They can be assigned to physisorbed and/or weakly chemisorbed CO, molecules and to strongly bonded CO, -negatively charged surface radicals, respectively. The enhancement factor for the stretching mode of carbon dioxide is estimated to be of the order of 102-104, depending on the kinds of metal and types of adsorption, which demonstrates that SERS on colloidal silver or gold particles in solution offers possibilities for detecting CO, dissolved in liquids at low concentrations.

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Aqueous Dissolved Gas Measurements Using Near-Infrared Raman Spectroscopy

Cited by 41 publications

References 9 publications

Feasibility of Large-Scale Ocean Co2 Sequestration

Feasibility of Large-Scale Ocean Co2 Sequestration

Noninvasive Glucose Sensing with Raman Spectroscopy

Surface‐enhanced Raman scattering of CO₂ dissolved in aqueous colloidal solutions of silver and gold

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Aqueous Dissolved Gas Measurements Using Near-Infrared Raman Spectroscopy

Cited by 41 publications

References 9 publications

Feasibility of Large-Scale Ocean Co2 Sequestration

Feasibility of Large-Scale Ocean Co2 Sequestration

Noninvasive Glucose Sensing with Raman Spectroscopy

Surface‐enhanced Raman scattering of CO2 dissolved in aqueous colloidal solutions of silver and gold

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Product

Resources

About

Surface‐enhanced Raman scattering of CO₂ dissolved in aqueous colloidal solutions of silver and gold