Journal of Analytical Methods in Chemistry / 2014 / Article / Fig 1

Research Article

A Modified o-Phthalaldehyde Fluorometric Analytical Method for Ultratrace Ammonium in Natural Waters Using EDTA-NaOH as Buffer

Figure 1

Excitation (a) and emission (b) spectra of products of OPA-NH3-sulfite (pH 11.3) in the presence of EDTA.