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.
| | Matrix | Matrix spiked curve | Corresponding calibration curve | The average matrix spiked recovery |
| | Groundwater | FI =
( = 5, = 0.9961) | FI =
( = 5, = 0.9955) | 101.60% |
| | Mountain spring water | FI =
( = 5, = 0.9908) | FI =
( = 5, = 0.9941) | 103.83% |
| | Seawater | FI =
( = 5, = 0.9912) | FI =
( = 5, = 0.9923) | 97.60% |
|
|
