Hach DR/700 Procedures Manual page 497

MANGANESE, LR,
Magnesium
Nickel
Zinc
WASTE DISPOSAL
Dispose of all spent cyanide-containing wastes by following the steps
below.
a) Pour the waste into a large beaker and make alkaline (pH 11) with
calcium hypochlorite or sodium hypochlorite (bleach). Use good
ventilation or a fume hood.
b) Maintain an excess of sodium hydroxide and calcium hypochlorite.
Let stand for 24 hours.
c) With a large excess of water, flush the solution down the drain.
SUMMARY OF METHOD
The PAN method is a highly sensitive and rapid procedure for detecting
low levels of manganese. An ascorbic acid reagent is used initially to
reduce all oxidized forms of manganese to Mn
reagent is added to mask any potential interferences. PAN Indicator is then
added to combine with the Mn
REQUIRED REAGENTS
Manganese Reagent Set (100 Tests) . . . . . . . . . . . . . . . . . . . . . . 22433-00
Includes: (2) 21223-37, (2) 14577-99, (2) 21224-39
Description
Alkaline-Cyanide Reagent . . . 2 mL . . . . . . 100 mL . . . . . . . 21223-32
Ascorbic Acid
Powder Pillows. . . . . . . . . . 2 pillows . . . 100/pkg.. . . . . . . 14577-99
PAN Indicator
Solution, 0.1% . . . . . . . . . . 2 mL . . . . . . 118 mL . . . . . . . 21224-39
REQUIRED APPARATUS
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . 968-00
continued
300 mg/L as CaCO
40 mg/L
15 mg/L
2+
. An alkaline-cyanide
2+
to form an orange-colored complex.
Quantity
Per Test Unit
55-49
3
Cat. No.
Cat. No.