Measuring 0.010 – 0.500 mg/l CN 10-mm cell
range: 0.005 – 0.250 mg/l CN 20-mm cell
0.0020 – 0.1000 mg/l CN 50-mm cell
Expression of results also possible in mmol/l and cyanide readily liberated [CN(v)].
Cyanide
Determination of readily liberated cyanide
109701
Test
Add 1 level green micro-
spoon of CN-3, close the
cell with the screw cap.
Reaction time:
10 minutes
Transfer the solution into
a corresponding rectan-
gular cell.
Select method with
AutoSelector.
Place the cell into the
cell compartment.
Shake the cell vigorous-
ly to dissolve the solid
substance.
Add 1 level blue micro-
spoon of CN-4, close
the cell with the screw
cap.
Shake the cell vigorous-
ly to dissolve the solid
substance.
Add 10 ml of the sample
into an empty round cell
(Empty cells, Cat.No.
114724).
Add 1 dose of CN-1
using the green dose-
metering cap, close the
cell with the screw cap.
Heat the cell in the
thermoreactor at 120 °C
(100 °C) for 30 minutes.
Remove the cell from
the thermoreactor and
place in a test-tube rack
to cool to room tempera-
ture.
Swirl the cell before
opening.
Add 3 drops of CN-2,
close with the scew cap,
and mix
: pretreated
sample.
Quality assurance:
To check the measurement system (test reagents,
measurement device, and handling) ready-f
or-use
cyanide standard solution Certipur
®
, Cat.No. 119533,
concentration
1000 mg/l CN
–
, can be used after diluting
accordingly.
Check the pH of the
sample, specified range
:
pH 4.5 – 8.0.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Pipette 5.0 ml of the
pretreated sample into
an empty round cell
(Empty cells, Cat.No.
114724).
Note:
Empty cells with screw caps,
Cat.No. 114724
are recommend-
ed for the preparation. These
cells can be sealed with the
screw caps, thus preventing any
gas
losses.
Release 06/2014 - Spectroquant
®
UV/VIS Spectrophotometer Pharo 300
Important:
To measure in the 50-mm cell, the sample volume and
the volume of the reagents CN-3 and CN-4 hav
e to be
doubled for each.
Alternatively, the semi-microcell, Cat.No. 173502, can be
used.
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