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Synthesis and characterization of graphene quantum dots (GQDs) simultaneously doped with 1%glutathione (GSH-GQDs) by pyrolysis using citric acid rich-lime oil extract as a starting material. The excitation wavelength (lmax ? 337 nm) of the obtained GSH-GQD solution is blue shifted from that of bare GQDs (lmax ? 345 nm), with the same emission wavelength (lmax ? 430 nm) indicating di?erences in the desired N and S matrices decorating the carbon based nanoparticles, without any background e?ect of both ionic strength and masking agent. For highly Fe3+-sensitive detection under optimum conditions, acetate bu?er at pH 4.0 in the presence of 50 mMH2O2, the linearity range was 1.0–150 mM (R2 ? 0.9984), giving its calibration curve: y ? 34.934x + 169.61. The LOD and LOQ were found to be 0.10 and