TOC EVOLUTION:
USER &
MAINTENANCE MANUAL
Page:
11/74
Instructions No.: 10844
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TIC
Total Inorganic
Carbon
NPOC
Non Purgeable
Organic Carbon
Inlet
Sample
TOC=NPOC if VOC = 0
Standard
measurement
5 Introduction
Water generally contains carbon of mineral or organic origin, which is either dissolved or
suspended. The parameter, which is measured in most cases, is the total organic carbon in a sample. The
presence of carbon as suspended volatile organic compounds and mineral compounds cannot be ignored
and the TOC analysis often requires determining each of these forms.
TOC
The TOC EVOLUTION analyser from SERES is designed for determining these different carbonated
compounds:
-
Non Purgeable Organic Carbon (NPOC/TOC)
-
Total Inorganic Carbon (TIC) - (Option)
COD correlation
In addition, we have the "COD Correlation" configuration possible.
By measuring TOC we can deduce the oxygen demand (COD) of the sample analyzed.
Indeed a linear correlation coefficient can be applied* between the TOC and the COD of the form:
COD = A * TOC + B
With A = COD correlation coefficient
B = Offset COD
*This correlation is only valid if the customer process is stable and the customer has been able to
determine the correlation equation. This equation must be communicated to SERES when ordering the
analyzer.