Hach DR/700 - Page 570

61-14
CYANIDE, continued
4. Wait an additional
30 seconds, leaving
the sample cell
undisturbed.
5. Add the contents
of one CyaniVer 4
Cyanide Reagent
Powder Pillow. Cap
the sample cell.
6. Shake the sample
cell for 10 seconds.
Proceed immediately
with Step 7.
Note: Delaying the
addition of CyaniVer 5
Cyanide Reagent
Powder for more than
30 seconds after the
addition of the CyaniVer
4 Reagent Powder will
give lower test results.
Note: Accuracy is not
affected by undissolved
CyaniVer 4 Cyanide
Powder Reagent.
7. Add the contents
of one CyaniVer 5
Cyanide Reagent
Powder Pillow. Cap
the sample cell.
8. Shake vigorously
to completely
dissolve the CyaniVer
5 Reagent Powder
(the prepared
sample).
Note: If cyanide is
present, a pink color
will develop which then
turn blue after a few
minutes.
9. Wait 30 minutes.
Note: Samples at less
than 25
o
C require
longer reaction times
and samples at greater
than 25
o
C give low test
results.
30 seconds
30 minutes
10 seconds