Hach DR/700 Procedures Manual page 656

ZINC,
continued
WASTE DISPOSAL
ZincoVer 5 Reagent contains cyanide. Dispose of it safely as follows:
a) Use good ventilation or a fume hood.
b) Add the waste while stirring to a beaker containing a strong solution
of sodium hydroxide and calcium hypochlorite or sodium hypochlorite
(household bleach).
c) Maintain a strong excess of hydroxide and hypochlorite. Let the
solution stand for 24 hours.
d) Flush the solution down the drain with a large excess of water.
SUMMARY OF METHOD
Zinc and other metals in the sample are complexed with cyanide. The
addition of cyclohexanone causes a selective release of zinc. The zinc
then reacts with 2-carboxy-2'-hydroxy-5'-sulfoformazyl benzene
(zincon) indicator. The zinc concentration is proportional to the
resulting blue color.
REQUIRED REAGENTS
Description
Cyclohexanone . . . . . . . . . . . . 0.5 mL. . . . . 100 mL MDB . . 14033-37
ZincoVer 5 Reagent
Powder Pillows . . . . . . . . . . 1 pillow . . . . 100/pkg . . . . . . . 21066-69
REQUIRED APPARATUS
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . . 968-00
Cylinder, graduated,
mixing, 25 mL . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . 1896-40
DR/700 Filter Module
Number 61.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46261-00
Dropper, plastic, 0.5 and
1.0 mL marks . . . . . . . . . . . 1 . . . . . . . . . 10/pkg . . . . . . . . 21247-10
Quantity
Per Test Unit
61-100
Cat. No.