Various fluorescent sensors for the detection of As³⁺.

Materials	Readout mechanism	Working range (M)	LOD	Ref. no.
CdTe QD	Turn off	2 nM to 0.5 μM	2 nM	55
Thiol/CQDs	Turn off	5–100 ppb	0.086 ppb	56
CdTe QD/GSH	Turn off	5 × 10−6 to 25 × 10−5	2 × 10−8	57
CdTe/ZnS	Turn on	1 × 10−11 to 1 × 10−6	1.3 × 10−12	58
GSH/CQDs	Turn off	2–25 × 10−9	2.3 × 10−9	Present work