In a few reference books of environmental engineering is mentioned that maximum acceptable concentration of nitrate is 10 mg/L as N. What's the meaning of "as N" in this unit of measurement? What's the usage of it?
Thanks for your assistance
Hello Mr. Hajipour
"N" refers to a molecular nitrogen presents in a defined concentration of a molecule or ion. You can find it out by multiplying the molecular weight ratios.
In your example if N in the form of nitrate (NO3^-) is 10 mg, then the concentration of nitrate molecule will be 10 mg N*(62 mgNO3/mmolN)/(14 mgN/mmolN), i.e. 44.28 mg NO3^-.
Same concept is valid for any other atoms and molecules.
Regards
Hello Mr. Hajipour
"N" refers to a molecular nitrogen presents in a defined concentration of a molecule or ion. You can find it out by multiplying the molecular weight ratios.
In your example if N in the form of nitrate (NO3^-) is 10 mg, then the concentration of nitrate molecule will be 10 mg N*(62 mgNO3/mmolN)/(14 mgN/mmolN), i.e. 44.28 mg NO3^-.
Same concept is valid for any other atoms and molecules.
Regards
In biotechnology, the concentration of nitrogen compounds is usually related to nitrogen. This significantly facilitates the balancing of bioprocesses.
N means atomic Nitrogen, not N2 ( Molecular Nitrogen), the weight differs.
This may help
https://www.waterboards.ca.gov/centralvalley/board_decisions/tentative_orders/1704/22_sweeney_cdo/19_sweeney_cdo_pt_exh_14.pdf
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