DR/2400
Cobalt
Cobalt_PP_Other_PAN_Eng_Ody.fm Page 1 of 4
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust. See the
instrument manual for more information on Running a Reagent Blank.
• If the sample is less than 10 °C (50 °F), warm to room temperature prior to analysis.
• You can determine nickel with the same sample prepared with this method. Use Program Number 340. A reagent blank is
necessary for the nickel procedure.
• 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.
Cobalt
Method 8078
1-(2-Pyridylazo)-2-Naphthol (PAN) Method*
* Adapted from Watanbe, H., Ta l a nt a, 21 295 (1974)
Powder Pillows
(0.01 to 2.00 mg/L)
Scope and Application: For water and wastewater; digestion is required for determining total
recoverable cobalt (see Section 4); if EDTA is present, use the vigorous digestion.
1. Touch
Hach Programs.
Select program
110 Cobalt.
Touch
Start.
2. Fill a round sample
cell to the 10-mL mark
with sample. (This is the
prepared sample.)
3. Fill another round
sample cell to the 10-mL
mark with deionized
water. (This is the blank.)
4. Add the contents of
one Phthalate-Phosphate
Reagent Powder Pillow
to each cell. Cap.
Immediately shake to
dissolve.
If the sample contains iron
(Fe
+3
), make sure that all
of the powder is
completely dissolved
before continuing with
step 5.
Tips and Techniques
Powder Pillows Method 8078
Hach Programs
10 mL
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