Spectroquant Pharo 300 - Page 297

Determination:
Quality assurance:
To check the measurement system (test reagents, meas-
urement device, and handling) a COD/chlor
ide standard
solution must be prepared from Potassium hydrogen
phthalate, Cat.No.
102400 and Sodium chloride, Cat.No.
106404 (see section “Standard solutions”).
117059
Cell Test
COD
Chemical Oxygen Demand
for seawater / high chloride contents
Carefully pipette 3.0 ml
of the depleted sample
into a reaction cell, close
tightly with the screw cap,
and mix vigorously.
Caution, the cell
becomes hot!
Carefully pipette 3.0 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)
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.
Replace both cells in the
rack for complete cool-
ing to room temperature.
(Very important!)
Release 06/2014 - Spectroquant
®
UV/VIS Spectrophotometer Pharo 300
Suspend the bottom sed-
iment in two cells by
swirling.
Configure the photometer
for blank-measurement.
Place the cell containing
the sample
into the cell
compartment. Align the
mark on the cell with that
on the photometer.
Place the blank cell into
the cell compartment.
Align the mark on the cell
with that on the photo-
meter.