What are the interferences for the Nitrogen, Ammonia- Salicylate Methods?

Document ID

Document ID TE136

Published Date

Published Date 04/18/2019
Print
Question
What are the interferences for the Nitrogen, Ammonia- Salicylate Methods?
Summary
Interferences common to Nitrogen, Ammonia- Salicylate Methods
Answer
Details on known interfering substances can be found in the "Interferences" section the Nitroge, Ammonia- Salicylate Methods 8155, 10023, and 10031 from the Water Analysis Handbook (WAH). Listed below are the most common interferences:
Calcium
Iron
Magnesium
Nitrate
Nitrite
Phosphate
Sufate
Sulfide
Hydrazine
Glycine

For Iron interference, the following pretreatment steps can be considered:
1) Determine the amount of iron present in the sample by using one of the Iron, Total, procedures.
2) Use an iron standard solution to add iron to the deionized water blank so that the blank has the same iron concentration as the sample. The iron interference will be zeroed out from the test result.

For Sulfide interference, the following pretreatment steps can be considered:
1. Measure approximately 350 mL of sample in a 500-mL Erlenmeyer flask.
2. Add the contents of one Sulfide Inhibitor Reagent Powder Pillow. Swirl to mix.
3. Filter the sample through a folded filter paper and filter funnel.
4. Use the filtered solution in test procedure.

Was this answer helpful?

Submitting...
Thank you for your feedback!
There was an error with your submission. Please try again.