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LEAD,
continued
7.
Add 2 heaping
1.0 g scoops of
potassium cyanide,
ACS, to the funnel.
Stopper and shake
vigorously until the
potassium cyanide is
all dissolved (about
15 seconds). Let the
funnel stand
undisturbed for 1
minute.
Note: After the addition
of cyanide the bottom
layer will be pink if lead
is present. A pink color
in the bottom
(chloroform) layer after
Step 6 does not
necessarily indicate the
presence of lead.
8.
Insert a pea-sized
cotton plug into the
delivery tube of the
funnel. Drain the
bottom layer into a
dry 25-mL sample cell
(the prepared sample).
Cap the cell.
Note: The prepared
sample is stable for
hours if the sample cell
is kept tightly capped
and out of direct
sunlight.
52-81
9.
Fill a 25-mL cell
to the 25-mL line
with chloroform (the
blank). Cap.
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