5.
Use a graduated cylinder
to pour 25-mL of prepared
arsenic absorber solution
(refer to
on page 5)
into the cylinder/gas bubbler
assembly.
6.
Attach the cylinder/gas
bubbler assembly to the
distillation apparatus.
7.
Use a graduated cylinder
to pour 250 mL of sample
into the distillation flask.
8.
Set the heater power to
on. Set the stir control to 5.
Set the heat control to 0.
9.
Use a graduated cylinder
to add 25 mL of
Hydrochloric Acid ACS to
the distillation flask.
10.
Use a serological pipet
to add 1 mL of Stannous
Chloride Solution to the
distillation flask.
11.
Use a serological pipet
to add 3 mL of Potassium
Iodide Solution to the
distillation flask. Put the cap
on the flask.
12.
Start the instrument
timer. A 15-minute reaction
time starts.
13.
When the timer expires,
weigh and add 6.0 g of
20-mesh zinc to the
distillation flask.
Put the cap
on the flask immediately.
14.
Set the heat control to
3.
15.
Start the instrument
timer. A 15-minute reaction
time starts.
16.
When the timer expires,
set the heat control to 1.
Arsenic Silver Diethyldithiocarbamate Method (0.200 mg/L)
3
