Journal of Analytical Methods in Chemistry / 2014 / Article / Fig 3

Research Article

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

Figure 3

Effect of OPA concentration in the final solution on the reaction of OPA-NH3-sulfite ((a) 0.25 μmol/L, (b) blank).