Hach DR/700 Procedures Manual page 570

CYANIDE,
30 seconds
4.
Wait an additional
30 seconds, leaving
the sample cell
undisturbed.
7.
Add the contents
of one CyaniVer 5
Cyanide Reagent
Powder Pillow. Cap
the sample cell.
continued
5.
Add the contents
of one CyaniVer 4
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.
61-14
10 seconds
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.
30 minutes
9.
Wait 30 minutes.
Note: Samples at less
o
than 25 C require
longer reaction times
and samples at greater
o
than 25 C give low test
results.