In nitrate nitrogen analysis, for nitrate stock solution, if 72.2 mg potassium nitrate added in smf & made upto 100 ml by adding distilled water gets 100 ppm can you explain how? and in that same experiment if 10 ml stock pipetted into 100 ml it ll be 10 ppm which is standard but as per procedure for standard we can vary standard solution from 0.5 ml to 5 ml & so on. so if i add 0.5 ml standard solution then made upto 5 ml by distilled water, then again 1 ml brucine-sulphanilic acid solution added as per procedure, what will be the concentration of this?
The formula weight of KNO3 is ~102 of which the N component is ~14. In round terms, 100 mg KNO3 contains 14 mg of N and 72 mg contains ~10 mg of N. Dissolved in 100 mL this is 100 mg N/L.
Simply forget about the brucine dilution because that is common to the standards and the samples
@Ali Alhayany sir and @Paul Milham sir: during standard solution preparation we added 10 ml sulphuric acid & 10 ml distilled water as per procedure in dark place and so on, whether i have to neglect that too for concentration calculation from stock?
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