Comparison of the electrochemical sensors for the detection of ammonium ions.

Sensing material	Detection range	Detection limit	Method of detection	Detection medium	Types of sample	Ref.
PMB@GLDH/AuNPs/SPEC	0.65–300 μM	N/A	Amperometry	PBS (pH 9.5)	Water	148
Ag-CNT	0.2–1 mM	1 μM	DPV	0.1 M Na2SO4	Groundwater	141
Ppy COSANE-Au microelectrode	1 μM to 40 mM	0.04 mM	Potentiometric	Buffer Tris-HCl/Tris	Tap/sewage water	142
NH4+ selective ASS electrode	1 μM to 0.1 M	<1 μM	Potentiometric	N/A	Tap/well water	143
Solid state ISM	1–64 mg N/L	1 × 10−6.5 M	Potentiometric	N/A	Wastewater	144
Natural zeolite clinoptilolite-Au interdigitated microelectrode (IDμE)	0.01 μM to 1 mM	0.01 μM	Conductometric	5 mM KH2PO4/Na2HPO4 (pH 6.2)	N/A	145
25,27-Di-(5-thio-octyloxy)calix[4] arene-crown-6-Au interdigitated electrode (IDE)	0.01–1 mM	0.01 mM	Conductometric	5 mM KH2PO4/Na2HPO4 (pH 6.2)	River water	146
Alanine dehydrogenase/SPE	10–100 mM	0.18 mM	Amperometric	PBS (pH 7)	N/A	150
PET microporous membrane	4.2–66 μM	0.12 μM	CV, DPV, SWV	Water/1,6-dichlorohexane	Water	149