Arsenic; (0 To 0.200 Mg/L As) - Hach DR2400 Manual

DR/2400
(
Method 8013
Scope and Application:
for reporting for drinking and wastewater analysis (digestion required, see Section 4 on page 55 for the
digestion procedure.)
* Adapted from Standard Methods for the Examination of Water and Wastewater.
** Procedure is equivalent to USEPA Method 206.4 for wastewater and Standard Method 3500-As for drinking water analysis.
Tips and Techniques
• This procedure requires a user-entered calibration for each new lot of arsenic absorber solution. See Calibration on page 5.
• Some variations of the calibration procedure are possible. See the Instrument Manual for details.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• The arsenic absorber in this test is a silver solution in pyridine. Both silver (D011) and pyridine (D038) are regulated by the
Federal RCRA as hazardous waste. In addition, the cotton ball soaked in lead acetate (D008) solution is a hazardous waste.
These materials should not be poured down the drain. See Section 4 of this manual for more information on proper disposal of
these materials.
Hach Programs
1.
Perform the User
Programming procedure
on page 5.
Arsenic_None_Other_SDC_Eng_Ody.fm
For water, wastewater, and seawater; distillation is required; USEPA accepted**
User Program
2.
Touch
.
User Program
Select the program
number for arsenic.
Touch
Start.
Silver Diethyldithiocarbamate Method*
3.
Prepare the Hach
Distillation Apparatus
for arsenic recovery. See
the Hach Distillation
Manual for assembly
instructions. Place it
under a fume hood to
vent toxic fumes.

Arsenic

(0 to 0.200 mg/L As)

Method 8013
4.
Dampen a cotton ball
with 10% Lead Acetate
Solution. Place it in the
gas scrubber. Be certain
that the cotton seals
against the glass.
Arsenic
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