wtw PROTOC 200, Operating Manual

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Installation PROTOC 200
3 - 12
The table lists the quantities of chemicals that are required:
Prepare the reagent solution as follows:
Preparing the reagent
solution
Note
A higher acid concentration in the reagent solution is required for appli-
cations in which the proportion of inorganic carbon (inorganic carbon =
IC) to the TOC is very high (IC > 50, TOC < 10), or for applications that
have a high pH value. We recommend doubling the acid quantities in
the above table, i.e. 200 ml acid to 20 liters water.
Note
The reagent solution has a shelf life of several weeks.
3.2.2 Standard solution
You will need a standard solution of known carbon concentration to cal-
ibrate the analyzer. Usually a supply of the standard solution with 1000
ppm carbon is prepared.
Prepare the standard solution as follows:
Preparing the standard
solution
Concentra-
tion Sodium
persulfate Water for
dilution Acid
2.5 % 500 g 20 liters 100 ml
5 % 1 kg 20 liters 100 ml
10 % 2 kg 20 liters 100 ml
1 Fill a clean 5 or 10 liter container half full with water.
2 Add the sodium persulfate and dissolve it completely. Add
more water if required.
3 Add the acid.
4 Transfer the solution to the reagent container and fill it to the
required level with water.
1 Ensure that the accessories and the container are free from or-
ganic contamination.