Operation multi N/C 2100S
48
6 Operation
6.1 General information for the analysis work
Observe the following during analysis:
When analyzing samples with high acidic or saline content, aerosol can be formed in
the TIC condensation vessel. The capacity of the halogen trap is depleted within a
relatively short time. The aerosol trap also clogs up quickly. Both components have to
be renewed frequently if this is the case. Where possible such samples should be
diluted prior to the measurement (e. g. 1:10).
When significant aerosol formation occurs, the analyzer is immediately protected by
the integrated aerosol trap (water trap) and the carrier gas supply is interrupted. In
addition, the large water trap must be unplugged from the connection to the TIC
condensate container to protect the analyzer.
To acidify samples only use hydrochloric acid (HCl) p. A. c = 2 mol/l, made from HCl
p. A. (conc.) and TOC water.
For the TIC detection only ortho-phosphoric acid (H
3
PO
4
), made from ortho-
phosphoric acid (concentrated) p. A. and TOC water:
10 % phosphoric acid for automatic metering
For each injection only the maximum indicated sample volume of 500 μl may be
applied. The sample application may only be performed after the multiWin prompt
and in the stated intervals.
Only clean, particle-free glass containers (volumetric flasks, vials) are to be used for
the creation and storage of substances.
When creating and storing substances in the range of < 1 mg/l special care has to be
taken that the substance concentrations can be slightly modified by the contents in
the laboratory air (CO
2
, organic vapors). Take the following precautionary measures
for this:
• Keep the head room above the liquids as small as possible.
• Cover the sample vials on the sample tray with foil during autosampler operation
(difference mode).
• Remove the source of organic vapors.
6.2 Switching on the analyzer (standard commissioning)
CAUTION
Concentrated phosphoric acid is required for the measurement process! The contact with
phosphoric acid can cause severe skin and eye injuries!
ear goggles and protective gloves when handling concentrated phosphoric
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