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

Research Article

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

Table 3

Calibration curves and the corresponding performances.

MethodExcitation/emission slit widthsCalibration curvesStandard deviation of the interceptStandard deviation of the slopeLinearity range (μmol/L)

3 nm/5 nmFI = 60.997011.9038.870.032–0.500
The proposed method3 nm/3 nmFI = 60.99964.882.940.25–3.00
1.5 nm/1.5 nmFI = 80.99715.580.811.00–15.0

The classical method3 nm/5 nmFI = 60.99515.7112.660.25–2.00