Hach DR2400 - Page 90

Arsenic
Arsenic
Page 2 of 6
Arsenic_None_Other_SDC_Eng_Ody.fm
5. Prepare the arsenic
absorber solution as
directed under Reagent
Preparation on page 4.
6. Using a graduated
cylinder, pour 25-mL of
prepared arsenic
absorber solution into the
cylinder/gas bubbler
assembly.
Attach it to the distillation
apparatus.
7. Using a graduated
cylinder, pour 250 mL of
sample into the
distillation flask.
8. Turn on the power
switch. Set the stir control
to 5. Set the heat control
to 0.
9. Using a graduated
cylinder, 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 flask.
11. Use a serological
pipet to add 3 mL of
Potassium Iodide
Solution to the flask. Cap.
12. Touch the timer icon.
Touch
OK.
A 15-minute reaction
period will begin.
13. When the timer
beeps, add 6.0 g of
20-mesh zinc to the flask.
Cap immediately.
14. Set the heat control
to 3.
15. Touch the timer icon.
A second 15-minute
reaction period will begin.
16. When the timer
beeps, set the heat control
to 1.
See
Text
Below
Heat
control:
0
Heat
control:
0
Heat
control:
0