Millipore Spectroquant Multy Operating Manual page 108

Measuring range: 50–3000 mg/l COD or O
Chloride depletion:
Pipette with glass pi- Pipette with glass pi-
pette 20 ml of the sam- pette 20 ml of distilled
ple into a 300-ml water (Water for chro-
Erlenmeyer flask with matography LiChrosolv
NS 29/32. Cat.No. 115333, is
recommended) into a
second 300-ml Erlen-
meyer flask with NS
29/32.
Fill 6 - 7 g each of Close the absorption
Sodalime with indica- tubes with the glass
tor (Cat. No. 106733) stoppers, and attach
into two absorption to the top of the
tubes (Cat. No. 115955). Erlenmeyer flasks.
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
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
Release 08/2014 - Spectroquant
COD
Chemical Oxygen Demand
for seawater / high chloride contents
16-mm cell
2
Add to each a magnetic
stirring rod, and cool in
the ice bath.
®
,
Stir at 250 rpm for 2 h at
room temperature:
depleted sample /
depleted blank
®
Multy
Add slowly to each Cool both Erlenmeyer
Erlenmeyer flask 25 ml flasks to room tempera-
of Sulfuric acid for the ture in the ice bath.
determination of COD
(Cat. No. 117048) with
glass pipette under
cooling and stirring.
Check the chloride content
of the depleted sample
TM
using the MColortest
Chloride Test (Cat. No.
111132) as per the appli-
cation instructions (see the
website):
specified value <250 mg/l
-
.
Cl
117059
Cell Test
TM
Chloride Tests,