Determination of water by near-infrared spectrophotometry

Keyworth, D.A.

doi:10.1016/0039-9140(61)80120-3

Cited by 17 publications

(6 citation statements)

References 4 publications

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“…Although careful calibration of the NIRS absorptivity would be required for different monomer systems 15 , the usefulness of the NIRS technique for assessing the influence of filler properties on water uptake is supported since the outcome is not affected by the dissolution of polymeric components. [14][15][16] In the present study, all test materials contained an initial amount of water following 'dry' storage. This may reflect the effect of ambient humidity during specimen production and/ or at the source of manufacture of the monomer paste.…”

Section: Discussionmentioning

confidence: 99%

“…A Fourier transform infrared (FTIR) spectrometer (Matrix-F, Bruker, WI, USA) was used to determine water content from the absorbance band centred around 5200 cm À1 (symmetric stretch and bend of the O-H bond of water [14][15][16] ). The absorbance spectrum was collected by averaging 62 scans over the spectral region of 11,000-4000 cm À1 with a resolution of 4 cm À1 and a base-line correction conducted.…”

Section: Near-infrared Spectroscopymentioning

confidence: 99%

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Water uptake and strength characteristics of a nanofilled resin-based composite

Curtis

Shortall

Marquis

et al. 2008

Journal of Dentistry

152

101

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Section: Discussionmentioning

confidence: 99%

Section: Near-infrared Spectroscopymentioning

confidence: 99%

Water uptake and strength characteristics of a nanofilled resin-based composite

Curtis

Shortall

Marquis

et al. 2008

Journal of Dentistry

152

101

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“…Higher harmonics are less absorbing than lower harmonics. The NIR region is particularly useful in studying the IR absorptions of bonds containing hydrogen [1]. The strongest NIR absorption for water, the υ 2 + υ 3 combination band of the asymmetric stretch ( υ 2 ) and the bending vibration ( υ 3 ), is at about 5200 cm −1 .…”

Section: Introductionmentioning

confidence: 99%

Estimation of concentration and bonding environment of water dissolved in common solvents using near infrared absorptivity

Dickens¹,

Dickens²

1999

J. Res. Natl. Inst. Stand. Technol.

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Integrated near infrared (NIR) absorbance has been used to determine the absorptivity of the υ2 + υ3 combination band of the asymmetric stretch (υ2) and the bending vibration (υ3) for water in several organic solvents. Absorptivity measured in this way is essentially constant across the absorption envelope and is found to be 336 L mol−1 cm−1 with a standard deviation of 4 L mol−1 cm−1 as estimated from a least squares fit of a straight line to data from water concentrations between 0.01 mol/L and 0.06 mol/L. Absorptivity measured from the peak maximum of the υ2 + υ3 combination band of water varies with the type of hydrogen bonding of the water molecule because the shape of the NIR absorption envelope changes with the hydrogen bonding.Because the integrated NIR absorptivity of the υ2 + υ3 combination band of water is essentially constant across the absorption envelope, the NIR absorption envelope reflects the distribution of hydrogen bonding of the water. The shape and location of the absorption envelope appear to be governed mostly by the number of hydrogen bonds from the water molecules to easily polarized atoms. Water that is a donor in hydrogen bonds to atoms which are not easily polarized (such as the oxygen of a typical carbonyl group) absorbs near 5240 cm−1 to 5260 cm−1. Water that donates one hydrogen bond to an easily polarized atom (such as a water molecule oxygen) absorbs near 5130 cm−1 to 5175 cm−1, and water that donates two hydrogen bonds to easily polarized atoms is estimated to absorb near 5000 cm−1 to 5020 cm−1. Water donating two hydrogen bonds to other water molecules may be said to be in a water-like environment. In no case does a small amount of water absorbed in a host material appear to have a water-like environment.

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“…HerZberg [6] assigns the 5332 cm-1 band observed under low water pressures to the w2 + Ws vibration combination. This region of the spectrum has ':>een utilized for the quantitative determination of water [7]. The molar extinction coefficient of water is dependent on the solvent in each case, as is the wavelength of the maximum absorbance.…”

Section: Introductionmentioning

confidence: 99%

New Infrared Study of Water in Ion Exchange Resins

Cohen

Peretz

1969

Israel Journal of Chemistry

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The water present in cation and anion exchange resins for a series of counter-ions was examined spectroscopically using the 1.9 /l water band. The spectrum of the water in the resins dried to constant weight was characteristic for the counter-ion present. The changes in the wavelength of the maximum absorbance was compared to the behaviour of the spectrum of ions in solution. The spectra of these resins were also related to the hydration numbers of various ions.

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Determination of water by near-infrared spectrophotometry

Cited by 17 publications

References 4 publications

Water uptake and strength characteristics of a nanofilled resin-based composite

Water uptake and strength characteristics of a nanofilled resin-based composite

Estimation of concentration and bonding environment of water dissolved in common solvents using near infrared absorptivity

New Infrared Study of Water in Ion Exchange Resins

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