52-87
LEAD, continued
Highly buffered samples or extreme sample pH may exceed the
buffering capacity of the reagents and require sample pretreatment; see
Interferences, pH (Section I).
WASTE DISPOSAL
Disposal of cyanide-containing wastes by following the steps below.
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
The DithiVer Metals Reagent is a stable powder form of dithizone. Lead
ions in basic solution react with dithizone to form a pink to red lead-
dithizonate complex, which is extracted with chloroform.
REQUIRED REAGENTS
Cat. No.
Lead Reagent Set (90 Tests) . . . . . . . . . . . . . . . . . . . . . . . . . . . 22431-00
Includes: (1) 14202-99, (2) 14458-17, (4) 12616-68,
(2) 767-14, (1) 2450-53, (2) 2450-26
Quantity
Description Per Test Units Cat. No.
Buffer Powder Pillows,
Citrate for heavy metals . . . 1 pillow . . .100/pkg . . . . . . . 14202-99
Chloroform, ACS . . . . . . . . . . 50 mL . . . . .4 L . . . . . . . . . . . 14458-17
DithiVer Metals Reagent
Powder Pillows. . . . . . . . . . 1 pillow . . . .25/pkg . . . . . . . . 12616-68
Potassium Cyanide, ACS . . . . 2 g . . . . . . . . 113 g . . . . . . . . . . 767-14
Sodium Hydroxide
Solution, 5 N . . . . . . . . . . . 5 mL . . . . . .1000 mL . . . . . . . 2450-53
Sodium Hydroxide, 5 N . . . . . drops . . . . . .59 mL DB . . . . . . 2450-26
Water, demineralized. . . . . . . . 350 mL . . . .4 L . . . . . . . . . . . . 272-56
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