Simultaneous determination of cadmium(<scp>ii</scp>), lead(<scp>ii</scp>), copper(<scp>ii</scp>) and mercury(<scp>ii</scp>) using an electrode modified by N/S co-doped graphene

NSRG has superior sensitivity, selectivity, reproducibility, stability and practicality, exhibiting broad application prospects in the field of electrochemical sensing.