A Novel Analytical Method for Trace Ammonium in Freshwater and Seawater Using 4-Methoxyphthalaldehyde as Fluorescent Reagent

Table 2

The data of the calibration curves of the proposed method and the OPA method.

The proposed method		The OPA method
, mol/L	FI signals	, mol/L	FI signals
0	106.558	0	19.495
0.025	122.59	0.2	40.082
0.05	155.229	0.4	67.216
0.1	207.895	0.8	114.717
0.2	262.620	1.2	172.028
0.3	362.817
The regression equation	(, )	The regression equation	(, )