N-Doped Carbon Dots Derived from Melamine and Triethanolamine for Selective Sensing of Fe³⁺ Ions

Table 1

Estimation of Fe³⁺ ion quantity in collected water samples using NCDs.

Synod	Water samples^a	Fe^3+ spiked (μM)	Fe^3+ found (μM)	Recovery (%)	R.S.D^b () (%)
1	Tap water			93	.36
2	Lake water			95	0.18
3	Well water			93	0.21
4	Mineral water			96	0.49
5	Distilled water			92	0.28
6	Purified water			95	0.61

^aWater samples were collected from throughout the Vellore district, India; ^brelative standard deviation.