The principal advantage of using Non-Dispersive Infrared (NDIR) is that it directly and specifically measures the CO2 generated by oxidation of the organic carbon in the oxidation reactor, rather than relying on a measurement of a secondary, corrected effect, such as used in conductivity measurements.
Advantages of NDIR Analyzers
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The low temperature techniques have the advantage of allowing a large volume of sample to be analyzed thereby improving the low limit of detection.
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Also the blank value is very low as long as the reagents are pure, which makes the analysis more accurate
Disadvantages of NDIR Analyzers
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Usually the particulates are more difficult to oxidise by nature or organics escape exposure to the reagents by being within the interstitial spaces of the particles.
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High molecular weight compounds such as proteins may be slow to oxidise with the low temperature techniques.