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4.
Turbidity Measurement Principles (cont.)
6
As detection involves the difference between the light reaching the vial and
transmitted by the sample placed at the cuvette, it is convenient to minimize the effects
that diminish the light intensity transmitted, among those the most important, it is the
absorption caused by the samples color.
Because of this it is essential to work in a light wavelenght where absorption would be
minimum (close to infrared), if we work in a electromagnetic spectrum visible region, this
color interference would certainly alter the results.
In order to quantify the turbidity, we can use many comparison standards, being NTU
(Nephelometric Turbidity Unit) scale the most common, patronized from formazine
standard suspensions. This way we would have a comparison standard scale between
different materials, in a way we can evaluate turbidity with precision.
Bibliographic References
Bela G. Lipták (chief editor) Analytical Instrumentation;
Howard A. Strobel and William R. Heineman, Chemical Instrumentation, A Systematic
Approach.
Detector
Reflected Light @ 90°
Transmitted
Light
Light Emitting
near “ IR”
Vial
90°
Содержание TRCN443
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