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Total Organic Carbon Analyzer
(sparges) the CO
converted from the TIC and it is measured by an
2
independent CO
detector as "TIC". POC is also stripped from the
2
sample in the sparger as HC, but the HC is undetected by the CO
detector and does not interfere with the TIC measurement.
A portion of the same sample is also directed to the oxidation
reactor, where inorganic and all organic carbon is converted to CO
detected by a second CO
A mathematical subtraction of the TIC from the TC measurement
yields a complete, Total Organic Carbon analysis performed as a "TOC-
True" method.
The difference between the Model 6750's TOC-True Method
and other simple (TC-TIC) subtraction methods is that most other
simple TC-TIC subtraction methods only deal with a TC measurement,
then a separate TIC measurement and a simple mathematical difference
to derive a "TOC" analysis.
In the TOC-True method used by the Model 6750, the analyzer
actually performs both TC and TIC measurements simultaneously and
continuously on the same sample. The TOC Measurement Basics and
Methods are illustrated in Figures 2-3 and 2-4.
In conclusion:
1. NPOC is the preferred method if no POC/VOC is present
in the sample.
2. TOC-True is the preferred method if POC/VOC exists in
the sample and a TOC analysis is desired which includes
all organic carbon species, for a TOTAL Organic Carbon
measurement.
Teledyne Analytical Instruments
detector as "Total Carbon".
2
TOC - True = TC - TIC
Theory of Operation
2
and
2
7
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