An infrared spectrophotometric method of estimating polyethylene glycol 4000.

Davies, Margaret; Shields, R.

doi:10.1136/gut.9.5.617

Cited by 2 publications

(3 citation statements)

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“…Davies and Shields [ 5 ] used spectrophotometry to estimate the concentration of PEG 4000 in tyrode solution. They obtained a linear relationship between absorbance and PEG concentration with a rise of absorbance as the PEG concentration increases.…”

Section: Resultsmentioning

confidence: 99%

“…Researchers and scientists resort to a number of advanced techniques such as spectrophotometry (with or without chemical treatment) [4,5] or colorimetric methods [6]. Cheng et al [7] recently provided a review of the various techniques possible to measure PEG concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Because PEG is non-ionic or inert [ 3 ], measuring its concentration by standard chemistry techniques (e.g., electrical conductivity) is not possible. Researchers and scientists resort to a number of advanced techniques such as spectrophotometry (with or without chemical treatment) [ 4 , 5 ] or colorimetric methods [ 6 ]. Cheng et al [ 7 ] recently provided a review of the various techniques possible to measure PEG concentration.…”

Section: Introductionmentioning

confidence: 99%

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Development and Validation of a New Near-Infrared Sensor to Measure Polyethylene Glycol (PEG) Concentration in Water

Buzzi

Yuan

Routley

2017

Sensors

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A near-infrared absorption based laser sensor has been designed and validated for the real-time measurement of polyethylene glycol (PEG) concentration. The wavelength was selected after the determination of the absorption spectrum of deionised water and PEG solutions using a Varian Cary 6000i spectrophotometer, in order to limit the influence of PEG molecular mass on the absorption measurement. With this new sensor, the water is treated as the attenuating species and the addition of PEG in water reduces the absorbance of the medium. The concept was validated using three different PEG types (PEG 6000, 20,000, and 35,000) and it was found that the results follow Beer Lambert’s law. The influence of temperature was assessed by testing the PEG 20,000 at four different temperatures that could be encountered in a laboratory environment. The data show a slight temperature influence (increase of absorbance by 8% when the temperature rises from about 20° to about 29°). Following the validation phase conducted ex situ, a prototype of an immersible sensor was built and calibrated for in situ measurements.

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Section: Resultsmentioning

confidence: 99%