Measuring Methods; Tc Analysis; Toc Analysis; Tic Analysis - Endress+Hauser multi N/C 2300 Operating Manual

multi N/C 2300 (duo), multi N/C 2300 N
3.4

Measuring methods

3.4.1

TC analysis

3.4.2

TOC analysis

3.4.3

TIC analysis

3.4.4

NPOC analysis

The detection of several parameters can be combined in the control and analysis soft-
ware.
TC: Total Carbon
In TC analysis, the total carbon contained in the sample, i.e. the organic and inorganic
bound carbon, as well as elemental carbon, is detected.
The sample is dosed automatically into the combustion tube and digested, and the gen-
erated carbon dioxide is detected.
TN detection is possible in parallel to TC detection.
b
TOC: Total Organic Carbon
In TOC analysis, the total organic bound carbon contained in the sample is detected.
TOC determination is carried out in the analyzer using the differential method which can
be described with the following formula.
TOC = TC – TIC
TOC - total organic carbon
TC - total carbon
TIC - total inorganic carbon
Two sequential measurements are used on one sample to determine TIC and TC. The
calculated difference is given as TOC. The differential method detects volatile as well as
non-volatile organic carbon compounds.
TOC analysis can be used when the sample contains easily purgeable organic substances
such as benzol, cyclohexane, chloroform, etc. If the TIC content of the sample is signifi-
cantly above the TOC content, TOC analysis should not be applied.
TN detection is possible in parallel to TOC detection.
b
TIC: Total Inorganic Carbon
In TIC analysis, the total inorganic carbon from carbonates and hydrocarbonates, as well
as dissolved CO , is detected.
2
Cyanides, cyanates, isocyanates and carbon particles are not detected.
An aliquot of the sample is dosed directly into the TIC reactor to determine the inorganic
carbon (TIC). The CO is purged and detected.
2
NPOC: Non-purgeable Organic Carbon
During the NPOC analysis, the total non-purgeable organic carbon content of a sample is
detected.
Function and design
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