Table 3.

Comparison of limit of detection (LOD) and linear detection range for Fe³⁺ of carbon dots prepared from various biomass-based sources.

References	Carbon source	LOD (μM)	Linear detection range (μM)
[10]	Used black tea	0.25	0.25–60
[11]	Sweet potato	0.32	1–100
[12]	Bergamot	0.075	0.025–100
[13]	Silkworm	0.2	1–500
[14]	Sugarcane molasses	1.46	1–100
[15]	Onion waste	0.31	0–20
[16]	Curcumin	0.62	0–6
This work	Hamburger sandwich leftover	32	12.5–100