Difference between Nitrates and Nitrites reported as N under “Nutrients” and NO3/NO2 under “Calculated parameters”:

Created by: Andrew White

Modified on: Wed, 7 Nov, 2018 at 9:34 AM

The difference comes from the fact that dissolved nitrate is expressed in mg/L N, and the calculated value is converting the results to mg/L NO3.

For example, sample ROB-10:

When NO3 (as N) result of 2.2 mg/L N are converted to NO3 the molecular weight will be used:

Dissolved NO3 (as N) * molecular weight NO3/molecular weight N = Dissolved NO3 (as NO3)

2.2 mg/L * 62.0049/14.0067 = 9.74 mg/L

Andrew is the author of this solution article.

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