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Chapter 6: Analyzer Operation
It is recommended that TOC be measured whenever the sample may contain significant concentrations of
volatile organic compounds that would be lost from the solution if NPOC were measured.
Range
The Analyzer has four ranges (see Table 9). Select the range that best matches the most likely TOC levels in the
current sample. The range can be used for a sample that has a concentration less than the range listed in Table
9. For example, the 5,000 ppm range could be selected for a sample that is expected to contain 85 ppm of TOC.
However, it is important not to exceed the upper limit in each range. (For example, a sample thought to contain
more than 5,000 ppm must not be analyzed in the 5,000 ppm range. One of the two higher ranges must be
selected.) If a sample having too high a concentration is analyzed, the organics may not be completely oxidized,
and the reactor may become fouled with partially oxidized organic material. At best, the Analyzer will require a
significant time to rinse that material out of the reactor and high-pressure valves. At worst, the reactor may
require disassembly and cleaning.
If you do not know the approximate TOC level in your sample, then you can use the Auto Range function,
described below.
Auto Range
Use the Auto Range setting to let the Analyzer determine the best range for the current sample. The Analyzer
makes a preliminary measurement to determine the best range match, then enters normal analysis mode.
If you are using the Analyzer's Auto Range function, you will need to specify a calibration group to use with the
protocol. For more information, see "Calibration Groups" on page 98.
Acid
The solution must be acidified to a pH 2 to convert IC to CO
properly expelled from the Gas-Liquid Separator. Since the concentration of the acid reagent is 3M to 6M, a
setting of 1% is adequate for most samples. However, if the sample is highly basic or contains a large
concentration of pH buffers, increase the acid percentage appropriately. To determine the correct setting for
those kinds of samples, increase the acid percentage until further increases do not result in higher measured
values.
GE Analytical Instruments ©2013
Table 9: Ranges in the InnovOx Online TOC Analyzer
Up to 1,000 ppm
Up to 5,000 ppm
Up to 20,000 ppm
Up to 50,000 ppm
128 of 238
and to ensure that CO
2
produced in the Reactor is
2
DLM 68100-06 EN Rev. A
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