Carbon analysis with the TOC module
multi EA 5000
100
}
Start the control and analysis software and login with your username and password.
}
Initialize the analysis system by clicking on [Initialize analyzer].
ü
The initialization and automatic detection of all connected components will be
carried out.
}
Ready the samples.
}
Activate a pre-existing method via the Method |Method - activate menu item.
}
Alternatively: Create a new method in the Method |Method - new menu. Select the
measurement parameter in the method. Release and activate the method.
}
Select Start |Start - Analysis in the menu.
}
Select an analysis group or create a new one and confirm via [OK].
}
Create an analysis sequence.
}
Enter the sample ID for all sample in the Name field.
}
Release all sequence lines
}
Confirm the entries with [OK].
}
Click the [Start Measurement] button.
ü
The prepared analysis sequence is processed.
For manual sampling, follow the instructions in the software.
12.3.2 Notes for measuring operations
Observe the following instructions for operation of the TOC detector:
¡
Regenerate the TIC reactor before performing TIC determination (→ "Regenerating
the TIC reactor"
165).
¡
Dilute highly acidic and saline samples, e.g., 1:10.
Aerosols can form in the TIC reactor during analysis of these samples. The capacity
of the halogen trap will then be exhausted quickly and may clog.
¡
The water traps protect the NDIR detector from aerosols. In the event of excessive
aerosol formation, the software interrupts the carrier gas supply. Also in the event
of excessive aerosol formation, interrupt the connection between the water traps
and the outlet of the TIC reactor.
¡
To acidify samples: Use hydrochloric acid (HCl) at c = 2 mol/l. Create the acid from
concentrated HCl (p.a.) and TOC water.
¡
For TIC determination: Use 40 % orthophosphoric acid (H
3
PO
4
). Create the acid from
concentrated orthophosporic acid (p.a.) and TOC water.
¡
Only store solutions in clean, particle-free glass containers (volumetric flasks, sam-
ple containers).
Carbon dioxide and organic vapor in the air of the laboratory can slightly alter the con-
centration of samples and standard solutions.
¡
Remove the source of any organic vapor from the laboratory.
¡
Create low-concentration solutions (c < 1 mg/l) under a fume hood.
¡
Keep the free space above the liquid small in containers.
¡
Cover the sample containers with foil for sampler operation (differential mode).
