Table 2 Effect of the interfering ions on the differential pulse output signals of target ions.

Interferring ions	Concentration (µM)	Peak currents (µA)			Signal change %
Interferring ions	Concentration (µM)	Pb²⁺	Cd²⁺	Hg²⁺	Pb²⁺	Cd²⁺	Hg²⁺
Blank	50	282.22	100.86	70.9	–	–	–
Mg²⁺	50	268.86	68.9	51.36	− 4.73	− 31.7	− 27.6
Mg²⁺	110	264.22	81.91	57.27	− 6.37	− 18.8	− 19.2
Fe²⁺	50	236.31	92.04	106.77	− 16.3	− 8.74	50.6
Fe²⁺	110	217.91	88.91	96.45	− 22.8	− 11.8	36.03
Cr⁶⁺	50	189.31	86.81	98.5	− 32.9	− 13.9	38.9
Cr⁶⁺	110	181.77	80.81	101.9	− 35.6	− 19.9	43.7
Cr³⁺	50	286.63	115.09	81.04	1.56	15.01	14.3
Cr³⁺	110	285.22	124.81	95.18	1.06	24.4	35.2
Zn²⁺	50	185.77	47.95	120.36	− 34.2	− 52.5	69.8
Zn²⁺	110	150.31	72.22	284.0	− 46.7	− 28.4	100.0
Ca²⁺	50	246.81	82.13	52.71	− 12.5	− 18.6	− 25.7
Ca²⁺	110	319.04	115.9	71.86	− 13.0	14.9	1.35
Cu²⁺	50	340.9	82.40	44.22	20.8	− 18.3	− 37.6
Cu²⁺	110	136.4	0	63.09	− 51.6	− 100.0	− 11.0

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