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. 2008 Jun 1;8(6):3665–3677. doi: 10.3390/s8063665

Table 6.

Concentration of nitrite, nitrate and ammonium ions for water samples (n=2)

Water sample NO2-(ppm) NO3-(ppm) NH4+(ppm) pH
a) Tilapia Tank

Day 1 0 1.39 0.81 7.60
Day 4 0.18 1.62 1.60 7.38
Day 8 0.30 2.72 3.87 6.30
b) Catfish Tank

Day 1 0 1.05 0.66 7.70
Day 4 0.25 1.49 1.47 6.93
Day 8 0.32 1.78 3.44 6.67