What causes the ammonia blank value to be high?


Dokument-ID TE137


Veröffentlichungsdatum 27.05.2017
What causes the ammonia blank value to be high?
Causes for a high nitrogen ammonia reagent blank
The nitrogen-ammonia salicylate or Nessler methods use a reagent blank to zero the instrument before the reacted sample is measured. A reagent blank is deionized water plus the nitrogen-ammonia reagents.

A common reason for a high reagent blank measurement is a contaminated deionized water source. It would be recommended to use a new deionized water source and retest. If the high result remains, analyze a nitrogen ammonia standard solution of known concentration and contact  Hach Technical Support with the results of this test and the nitrogen-ammonia reagent set lot information.

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