Table 3.

Comparison of the present sensor system and other electrochemical Al³⁺ detection methods

Chelators used	Chelator modification method	Method based on	Detection limit	References
Alizarin red S	LbL assembly of (A.R.S./LDHs)n on ITO/PET	CV	10.1 nM	Present system
Alizarin red S	LbL assembly of (A.R.S./LDHs)n on ITO/PET	Spectrofluorimetry	23 nM	Present system
Alizarin red	Drop coating	ASV	19.21 μM	[55]
Pyrocatechol violet	Adsorption	ASV	0.26 μM	[56]
8-Hydroxy-quinoline	Adsorption	ASV	4 ppm	[51]
Mercaptosuccinic acid	Self-assembly onto gold nanoparticles modified S.P.E	CV	37 nM	[38]
p-((8-hydrocycloquiboline)azo) benzenethiol	Self-assembly onto a gold electrode	Potentiometry	8.32 × 10–3 nM	[57]
Haematoxylin with graphite powder and paraffin wax	blending	Voltammetry and EIS	100 nM	[58]
Alizarin red S	Sol–gel on glassy carbon electrode	DPV	80 nM	[59]
Alizarin red	Polymerization with PVA-SbQ	Amperometry	25 μM	[60]