41
Cyanide–3 (WAD)
10.2 Releasing Agent
1 L of 0.87 M acetic acid / 0.50 M zinc acetate / 0.52 M
sodium acetate
Make this releasing solution in a 1 L container and then place it
directly in the automatic re-pipettor supplied with the starter kit. This
is enough to treat 1300 samples.
1. Place a 1 L container onto a top-loading balance with a 1000 g
capacity or greater. We recommend this be prepared in the
hood as acetic acid fumes will be released. Tare the balance.
2. Into the tared 1 L container place 950 g deionized water. Then
dissolve 70.97 g sodium acetate trihydrate (NaC
2
H
3
O
2
· 3 H
2
O)
in this water. Dissolve 100 g zinc acetate monohydrate
(ZnC
2
H
3
O
2
· H
2
O) in this solution. Then add 52.5 g glacial
acetic acid (C
2
H
3
O
2
).
3. Transfer this solution to the re-pipettor, screw the cap on tight
and prime the pipet. The solution is ready to use in method
Cyanide–3.
10.3 Sources
• APHA–AWWA–WPCF Standard Methods for the Examination
of Water and Wastewater, 20th ed., Method 4500–CN–N., pp
4–0 to 4–34.
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