Page 9 - 6_TOC in daily practice
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Sum parameter – Total Organic Carbon
Continuous condensate monitoring using
the TOC-4200
SCA-130-604
When applying TOC determination to
condensates, few particles are usually
expected, but here as well, it is better to be
on the safe side with the higher oxidation
potential offered by catalytic combustion. It is
important to be able to quickly and reliably
detect every possible organic contamination.
Due to the low pollution level of the sample,
the catalyst remains stable over a long time
span, whereby the need for maintenance is
relatively low.
The chemical and petrochemical industry
uses superheated steam as energy carrier for ■ TOC-4200
the supply of energy needed in various The high-performance TOC-4200 analyzer
thermal processing steps. Superheated applies catalytic combustion at 680 °C. Three
steam is usually generated from ultrapure TOC analysis methods can be selected
water, which prevents damage to the boilers. depending on the sample characteristics:
In order to use as little water as possible, the differential method, addition method, direct
reflux condensate is redirected to the boiler. It method. Due to the automatic dilution
is, therefore, important to ensure that the function TOC analyses up to 20,000 mg/L are
condensate is free from organic pollutants. possible. In order to measure the total bound
nitrogen (TN), the TOC-4200 can be
■ TOC determination in condensate extended with a specific module.
The TOC parameter provides information on
organic pollution. The TOC can be easily
determined and is easy to implement in
process analysis. Two oxidation techniques
are now commonly used in TOC analysis:
Catalytic combustion, where carbon
compounds are converted into CO 2
using a catalyst under high
temperatures with subsequent
detection of the resulting CO 2 using
an NDIR detector The self-calibration option and an automatic
Wet chemical oxidation, which uses a dilution function enable a virtually
combination of UV irradiation and independent operation of the measuring
persulfate for oxidation. The resulting system which can be started and calibrated
CO 2 is either detected via an NDIR from one measuring station. The different
detector or a via conductivity detector.
measuring streams can be selected.
