sixty_reefer
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On the nitrates the reagent are:as I mentioned, acid will break down some organic P. I personally think there is some different explanation for mist of your result, including interference or partial detection of some organic phosphates.
Organics containing N will not be similarly broken down.
solution 1
sulphanilic acid
m-phenylenediamine dihydrochloride
hydrogen chloride
H314, h317, h318, h341, h411
solution 2
m-phenylenediamine dihydrochloride
hydrogen chloride
h314, h317, h318, h341, h412