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IR
SPECTROMETRICANALYSIS
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What is IR Spectrometry?Infrared spectroscopy (IR spectroscopy)
is thespectroscopy that deals with the infrared region ofthe
electromagnetic spectrum, that is light with alonger wavelength and
lower frequency than visiblelight.
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* Rapid and mobile determination of alcoholic strengthusing a
flow-through infrared sensor
*Ever since Gay-Lussac's time, the alcoholicstrength by volume
(% vol) has beendetermined by using densimetricmeasurements.
*At present, infrared (IR) spectroscopy incombination with
multivariate regression iswidely applied as a screening
procedure,which allows one to determine alcoholic
strength in less than 2 min without any samplepreparation.
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Alcoquick 4000The device uses a patented, spectroscopic
multiple-beam measuring procedure, which is based on
specialwavelengths in the infrared spectrum. Sample, waste,and
water hoses are connected to the device andpositioned in the
appropriate receptacles. When thedevice is switched on, the system
first conducts areference measurement with water. Next, the
samplemeasurement is started by using the device's touch-screen
display. The device samples approximately 40ml of alcoholic
beverage and displays the alcoholicstrength in less than 60 s.
After that, the next samplecan be directly measured. Following each
measuringseries, a cleansing cycle removes dirt and sampleresidue
from the measuring head. For this, cleaningfluid is used in the
sample position and a cleansingcycle is initiated by the
software.
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Steps for measuring alcoholic beverages using infrared
spectroscopy
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Notice the deep round p
eek after 3000
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*During method validation, the precision of the infrared sensor
wasfound to be equal to or better than densimetric or FTIR
methods.For example, the average repeatability, as determined in
6different wine samples, was 0.05% vol and the relative
standard
deviation was below 0.2%. Accuracy was ensured by analyzing
260different alcoholic beverages in comparison to densimetric or
FTIRresults. The correlation was linear over the entire range
fromalcohol-free beers up to high-proof spirits, and the results
were insubstantial agreement (R = 0.99981, p < 0.0001, RMSE =
0.279%
vol).
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CREDITS"Rapid and Mobile Determination of Alcoholic Strength in
Wine, Beerand Spirits Using a Flow-through Infrared Sensor."
Chemistry CentralJournal. Web. 07 Aug. 2011.
.
