AOX determination
multi X 2500
60
Pipette 8 ml of solution B into a 100-ml measuring cylinder and top up to 100 ml
with solution A, or
Pipette 40 ml of solution B into a 100-ml measuring cylinder and top up to 500 ml
with solution A.
When stored at 4 ±3 °C in well-sealed bottles, solutions A and B can be kept for
approx. 6 months.
The finished electrolyte solution (solution C) can be kept for approx. 30 days if kept
in a well-sealed glass container at 20 to 25 °C.
An end point routine is necessary after every electrolyte change. The end point routine
is used to adjust the electrolyte to the optimal operating range of the measuring cell.
The operating point of the coulometric measuring cell is in the range of 1500 to
5000 counts.
1.
Start the end point routine via the menu item S
YSTEM
E
ND POINT ROUTINE
2.
Use hose number 5 to pull the olive-tip suction adapter off the cover of the
measuring cell. Upon the prompt meter the HCl solution directly into the
measuring cell:
Measuring cell "sensitive": 200 µl of a 0.01 N HCl solution
Measuring cell "high concentration": 200 µl of a 0.1 N HCl solution
3.
Start the end point routine immediately after metering by clicking [OK].
4.
The status E
ND POINT ROUTINE
is displayed during the process in the window
STATUS
ANALYZER
. After the end point routine the status
STAND
-
BY TITRATION
and the current
indicator value are displayed in the window
STATUS ANALYZER
.
The system is ready for measurements.
The operating point determined for the combined electrode is displayed under the
menu item S
YSTEM
C
OMPONENT TEST
in the C
L
-AMP tab.
Observe the following instructions to protect the combined electrode against
unnecessary wear:
Always add fresh electrolyte to the measuring cell before the end point routine.
Do not carry out the end point routine several times in a row.
6.2.3
Performing measures using manual sample feed
WARNING
Concentrated sulfuric acid can cause severe chemical burns! Wear appropriate
protective clothing when working at the sulfuric acid container. Observe all
specifications in the safety data sheet!
Storage and durability of
the electrolyte solutions
Execution of the end
point routine
Protecting the combined
electrode
Содержание Analytik Jena Multi X 2500
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