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4.2
BioTector Operation
Detailed information on the system operation is available, in presentation and video formats, in the MMC/SD
card shipped with the BioTector. It is recommended to review these files to understand the system operation.
The BioTector is designed to provide continuous online single-component (e.g. TOC) or multi-component
(e.g. TOC & TN & TP) monitoring. The BioTector can operate with unfiltered samples including soft
particulates up to 100 µm in diameter, and will give accurate measurements even when fats, high levels of
salts and/or calcium is present in the sample.
In BioTector multi-component analyzers, the system can be configured as a;
1) TIC & TOC system to measure the Total Inorganic Carbon (TIC) and Total Organic Carbon (TOC)
content of a sample. The TOC result obtained from a TIC & TOC system represents the Non-
Purgeable Organic Carbon (NPOC). The TIC & TOC system is the standard system for samples
which does not contain any volatile organic material or for samples which contains insignificant
concentration of volatile organic material.
2) TC system to measure the Total Carbon (TC) content of a sample. The TC result obtained from a TC
system represents the sum of TIC, NPOC and Purgeable Organic Carbon (POC) content.
3) VOC system to measure the TIC, TOC, TC and Volatile Organic Carbon (VOC) contents of a sample
by means of two analysis reactions in single reactor configuration. VOC result represents the
Purgeable Organic Carbon (POC). The TOC result in a VOC system is calculated from the TC and
TIC measurements as TC – TIC. Therefore the TOC result includes the VOC (POC) content of the
sample. In other words, the TOC result represents the sum of NPOC and POC content.
TC, VOC and TC-TIC configurations are system optional features.
As a brief introduction, the operation of BioTector analyzers can be summarized as follows:
i.
A sample liquid is brought to the analyzer by means of a peristaltic pump. The sample is injected into
the BioTector reactor chamber.
ii.
A patented Two Stage Advanced Oxidation process (TSAO) oxidizes the organic material in the
sample.
iii.
The carbon dioxide formed in the oxidation process is sparged and measured by a Non-dispersive
Infrared (NDIR) analyzer.
iv.
The results are displayed as TIC, TOC, TC and VOC depending on system configuration.
v.
The oxidized liquid is discharged and collected in a sample catch-pot and again depending on system
configuration, the Total Nitrogen and/or Total Phosphorus analysis is carried out applying direct
photometric and/or colorimetric methods.
vi.
The sample tubes are purged by running the BioTector peristaltic sample pump in reverse direction.
4.2.1 BioTector Oxidation Method
A patented Two Stage Advanced Oxidation process (TSAO), which uses hydroxyl radicals as the oxidizing
agent, is used for the oxidation of the sample.
The hydroxyl radical oxidation is a powerful oxidation technology, which keeps the wetted reactor parts clean
in all types of applications. BioTector self-cleaning technology using hydroxyl radical oxidation ensures that
the cleaning of the reactor is not necessary.
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