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ARSENIC,
10.
Add 6.0 g of
20-mesh zinc to the
flask. Cap
immediately.
Note: Use an analytical
balance to weigh the
zinc metal.
Heat control: 0
13.
Turn the heat
off. Remove the
cylinder/gas bubbler
assembly as a unit.
continued
15 minutes
11.
Set the heat
control to 3. Wait 15
minutes.
14.
Rinse the gas
bubbler by moving it
up and down in the
arsenic absorber
solution.
12.
control to 1. Wait 15
minutes.
15.
to the 25-mL line
with the reacted
arsenic absorber
solution (the prepared
sample). Cap.
Note: If the solution
volume is less than
25 mL, add pyridine to
bring the volume to
exactly the 25-mL mark.
Do this only in a fume
hood. Cap and invert
several times to mix.
52-23
15 minutes
Set the heat
Fill a 25-mL cell
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