DR/2400
Selenium
Selenium_None_Other_DAB_Eng_Ody.fm Page 1 of 8
• Distillation is required for determining total selenium. See the Distillation on page 4 at the end of the procedure. Use the distillate
in step 2.
• Acetone (Cat. No. 14429-49) is a suitable solvent for removing toluene from glassware after results are measured.
• Toluene (F005) solutions are regulated as hazardous waste by the Federal RCRA. Do not pour these materials down the drain.
Water saturated with toluene, toluene solutions, and the cotton plug used in the delivery tube of the separatory funnel should be
collected for disposal with laboratory solvent wastes. See Section 4 on page 55 for more information on proper disposal of these
materials.
• 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.
• If there are visible water bubbles on the bottom of the cell, decant the top portion into a clean, dry 10-mL cell prior to reading the
sample.
Selenium
Method 8194
Diaminobenzidine Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
(0.01 to 1.00 mg/L)
Scope and Application: For water and wastewater
1. Touch
Hach Programs.
Select program
640 Selenium.
Touch
Start.
2. Measure 100 mL of
deionized water into a
500-mL Erlenmeyer flask.
Label the flask “blank”.
Measure 100 mL of
sample into a 500-mL
Erlenmeyer flask. Label
the flask “sample”.
3. Add a 0.2-g spoonful
of TitraVer
®
Hardness
Reagent to each flask.
Swirl to mix.
4. Add a 0.05-g spoonful
of diaminobenzidene
tetrahydrochloride to
each flask. Swirl to mix.
Tips and Techniques
10 mL
Method 8194
Hach Programs
SBB B S B S
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