Determination:
117058
Cell Test
COD
Chemical Oxygen Demand
for seawater / high chloride contents
Carefully pipette 5.0 ml
of the depleted sample
into a reaction cell, close
tightly with the screw cap,
and mix vigorously.
Caution, the cell
becomes hot!
Heat both cells in the
thermoreactor at 148 °C
for 2 hours.
Remove both cells from
the thermoreactor and
place in a test-tube rack
to cool.
Swirl both cells after
10 minutes.
Carefully pipette 5.0 ml
of the depleted blank
into a second reaction
cell, close tightly with the
screw cap, and mix vigor-
ously.
Caution, the cell
becomes hot!
(Blank cell)
Insert the cell containing
the sample into the cell
compartment. Align the
mark on the cell with
that on the photometer.
Press Test .
Replace both cells in the
rack for complete cool-
ing to room temperature.
(Very important!)
Insert the blank cell into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Zero .
Quality assurance:
To check the measurement system (test reagents, meas-
urement device, and handling) a COD/chloride standard
solution must be prepared from Potassium hydrogen
phthalate, Cat.No. 102400 and Sodium chloride, Cat.No.
106404 (see section “Standard solutions”).
Release 08/2014 - Spectroquant
®
Multy
Suspend the bottom
sediment in two cells by
swirling.
Select method 5 7 0 .
