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8/10/2019 Mtodo Prata
1/6
DDRR//22550000
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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 deionizedwater in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust. See theDR/2500 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 dissolvecompletely, 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 causecontamination. See Digestion on page 4for 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 toremove fingerprints or other marks.
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8/10/2019 Mtodo Prata
2/6
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Aluminum Negative interference above 30 mg/L
Ammonia Negative interference above 750 mg/L
Cadmium Negative interference above 15 mg/L
Calcium Positive interference above 600 mg/L
Chloride Negative interference above 19 mg/
Chromium6+ Negative interference above 90 mg/L
Copper Negative interference above 7 mg/L
Iron Negative interference above 30 mg/L
-
8/10/2019 Mtodo Prata
3/6
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(continued)
Interfering Substance Interference Levels and Treatments
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8/10/2019 Mtodo Prata
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