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The FI signals of different concentration standard ammonium solution in existence and in the absence of sodium citrate.
| Concentration of ammonium (C NH4+, μmol/L) | In the absence of sodium citrate | In existence of sodium citrate |
|---|---|---|
| 0 | 137.574 | 138.956 |
| 0.100 | 235.226 | 227.053 |
| 0.200 | 325.220 | 319.514 |
| 0.300 | 449.249 | 437.903 |
|
| ||
| The relationship between FI and C NH4+ | FI = 1025C NH4+ + 133.06 (r = 0.9975) | FI = 989.3C NH4+ + 132.46 (r = 0.9974) |
