My purpose is to determine nitrate and ammonium in organic fluid fertilizers (minimum six sample per day) but I'm undecided to buy a UV-Vis spectrophotometer or a semi-automatic kjeldahl distillation unit. I don't have any doubt that Nitrogen determination in organic liquid fertilizer (according to Devarda) works. My concern is that organic molecules can absorb at the same wavelength of NO3-N and NH3-N.
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