DR/2400
Silver
Silver_PP_Other_CLR_Eng_Ody.fm Page 1 of 6
• Digestion is required in samples with interferences. See Digestion on page 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.
• The graduated cylinder must be completely dry before beginning the test. If the Silver 1 Powder becomes moist, it will not dissolve
completely, which will inhibit color development.
• The sample pH for this test must be between 9 and 10. Do not use a pH meter to adjust the sample pH as it will cause
contamination. See Digestion on page 4 for the procedure to adjust pH.
• Generate a blank for each sample.
• 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.
Silver
Method 8120
Colorimetric Method
Powder Pillows
(0.005 to 0.700 mg/L)
Scope and Application: For water and wastewater.
1. Touch
Hach Programs.
Select program
660 Silver.
Touch
Start.
2. Add the contents of
one Silver 1 Powder
Pillow to a dry 50-mL
graduated mixing
cylinder.
If the Silver 1 Powder
becomes wet at this point,
the powder will not
dissolve completely,
which will inhibit color
development.
3. Add the contents of
one Silver 2 Reagent
Solution Pillow to the
cylinder. Swirl to
completely wet the
powder.
If clumps of dry powder
are present when the
sample is poured in, the
powder will not dissolve
completely, which will
inhibit color
development.
4. Use a 50-mL
graduated cylinder to
add 50 mL of sample to
the 50-mL graduated
mixing cylinder. Stopper
and invert repeatedly for
one minute.
Tips and Techniques
Powder Pillows Method 8120
Hach ProgramsHach Programs
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