An Amperometric Biosensor Based on Alanine Dehydrogenase for the Determination of Low Level of Ammonium Ion in Water

Table 5

The results of the comparative study of the AlaDH electrode and established Nessler method using different river water samples with appropriate dilution (𝑛=3)

Sample	Concentration of NH4^+ ion by biosensor (mean), mg/L (𝑛=3)	Concentration of NH4^+ ion by Nessler method (mean), mg/L (𝑛=3)	𝑡value
Sample 1	0.88±0.11	0.73±0.04	2.179
Sample 2	0.77±0.07	0.62±0.07	2.509
Sample 3	0.78±0.11	0.94±0.12	1.688
Sample 4	0.73±0.26	0.67±0.02	0.407
Sample 5	0.77±0.21	0.77±0.08	0.039