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

Table 4

Performance of AlaDH electrode response against different river water samples with appropriate dilution (𝑛=3).

Sample	Spiked NH4^+ ion concentration (mg/L)	Obtained NH4^+ ion concentration (mg/L)	Recovery (%)
Sample 1	0.17	0.20±0.06	119.2±35.2
Sample 2	0.34	0.26±0.14	76.2±41.1
Sample 3	0.51	0.47±0.04	91.9±7.8
Sample 4	0.68	0.72±0.06	105.1±8.8
Sample 5	1.02	0.78±0.17	76.7±16.6