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Nitrogen Content in Water

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What method I could in a academic chemical laboratory to determine the nitrogen content in water?

How could I then determine the quality of the water?

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The easiest way is by color comparision. For more information, please refer to:

There are many ways of measuring nitrogen forms. Total nitrogen can be determined by adding chemicals to convert all of the nitrogen forms in a sample to nitrate, and then measuring nitrate concentration. Nitrate and nitrite can be measured together or separately. Nitrate and nitrite are most often measured using a colorimetric method, which means the color of treated sample reflects the concentration of the ...

Solution Summary

This response provides guidelines on determining nitrogen content in water and the quality of that water.

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Nitrogen Content and Biochemical Oxygen Demand ( BOD )

We have a wastewater source whose flow is 2000 m3 per day; the stated BOD or bio-chemical oxygen demand in that wastewater is given as 5000 mg/l.

We are to use urea (NH2)2CO to provide nitrogen to the wastewater in a specific ratio of 100 parts (BOD) to 5 parts(Nitrogen) --- no more or no less.

The mass fraction of N in urea is given as 46.6% by weight; the solubility of urea in water is given as 51.6 grams/100 grams; and the density of the urea is provided as 760 kg/m3.

Given all of the above....how do I calculate how much elemental Nitrogen I need for this wastewater given the 100(BOD) to 5(N) ratio?

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