Pipette with glass pi-
pette 20 ml of the sam-
ple into a 300-ml
Erlenmeyer flask with
NS 29/32.
Stir at 250 rpm for 2 h at
room temperature
:
depleted sample /
depleted blank
Check the chloride content
of the depleted sample
using MColortest
TM
Chloride Test (Cat. No.
111132) according to the
application (see the web-
site):
specified value <250 mg/l
Cl
-
.
Close the absorption
tubes with the glass
stoppers, and attach
to the top of the
Erlenmeyer flasks.
117059
Cell Test
COD
Chemical Oxygen Demand
for seawater / high chloride contents
Add to each a magnetic
stirring rod, and cool in
the ice bath.
Add slowly to each
Erlenmeyer flask 25 ml
of Sulfuric acid for the
determination of COD
(Cat. No. 117048) with
glass pipette under
cooling and stirring.
Cool both Erlenmeyer
flasks to room tempera-
ture in the ice bath.
Fill 6 - 7 g each of
Sodalime with indica-
tor (Cat. No. 106733)
into two absorption
tubes (Cat. No. 115955).
T
max
: 45 °C
Chloride depletion:
Pipette with glass pi-
pette 20 ml of distilled
water
(Water for chro-
matography LiChrosolv
®
,
Cat.No. 115333, is rec-
ommended)
into a sec-
ond 300-ml Erlenmeyer
flask with NS 29/32
.
Chloride determination (acc. the application instructions - abridged version):
Fill 5.0 ml of sodium hydroxide solution 2 mol/l, Cat. No. 109136, into the test vessel of the MColortest
TM
Chloride Test,
Cat. No. 111132.
Carefully allow to run from the pipette 0.5 ml of depleted sample down the inside of the tilted test vessel onto the sodium
hydroxide solution and mix (Wear eye protection! The cell becomes hot!).
Add 2 drops of reagent Cl-1 and swirl. The sample directly turns yellow in color. (Reagent Cl-2 is not required.)
Holding the reagent bottle vertically, slowly add reagent Cl-3 dropwise to the sample while swirling until its color changes
from yellow to blue-violet. Shortly before the color changes, wait a few seconds after adding each drop.
Result in mg/l chloride = number of drops x 250
Measuring range: 50–3000 mg/l COD or O
2
16-mm cell
Release 06/2014 - Spectroquant
®
UV/VIS Spectrophotometer Pharo 300
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