Journal of Analytical Methods in Chemistry / 2014 / Article / Tab 4

Research Article

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

Table 4

The matrix spiked recovery.

MatrixMatrix spiked curveCorresponding calibration curveThe average matrix spiked recovery

GroundwaterFI =
( = 5, = 0.9961)
FI =
( = 5, = 0.9955)
101.60%

Mountain spring waterFI =
( = 5, = 0.9908)
FI =
( = 5, = 0.9941)
103.83%

SeawaterFI =
( = 5, = 0.9912)
FI =
( = 5, = 0.9923)
97.60%