Function and setup
multi N/C pharma UV
26
the carbon content in the sample is performed via a previously determined calibration
function.
3.3
Measuring method
The analyzer multi N/C pharma UV is used to determine the following parameters as
sum parameters.
TC -
T
otal
C
arbon
TOC -
T
otal
O
rganic
C
arbon
TIC -
T
otal
I
norganic
C
arbon
NPOC -
N
on
P
urgeable
O
rganic
C
arbon
DOC - dissolved organic carbon (corresponds to TOC after sample filtration through
0.45 µm filter) (
D
issolved
O
rganic
C
arbon)
In the control and analysis software multiWin the detection of several parameters can
be combined.
3.3.1
TC analysis
During the TC analysis the total carbon contained in the sample, i.e. organic and
inorganic bound carbon as well as elemental carbon is detected.
The sample is metered automatically via a syringe, digested and the generated carbon
dioxide is detected.
3.3.2
TOC analysis
During the TOC analysis the total organic carbon content of a sample is detected.
The TOC determination in the analyzer is performed according to the differential
method, which can be described with the following equation (2).
TOC = TC – TIC
(2)
TOC.
total organic carbon
TC.
total carbon
TIC
total inorganic carbon
Two sequential measurements are used in the same sample consecutively 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.
The TOC analysis should be used when the sample contains easily purgeable organic
substances as benzene, cyclohexane, chloroform, etc. The TOC analysis should not be
used when the TIC content of the sample is significantly higher than the TOC content.
Содержание Analytik Jena multi N/C
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