Detection of Selenium and Nickel Metal Ion in Water Using Mn₃O₄-Cn-Modified Electrode

Table 2

Analytical results of real water samples.

Metal ions	On-site collection of samples	Added in sample, µg/L	Determined in sample µg/L	Recovery (%)
Ni (II)	Tap water	10	10.5	102
Se (IV)			9.75	97
ICP-MS			10.3	101
Se (IV)	Site 1	10	28.6 ± 0.03	120
	Site 2		18.67 ± 0.05	115
	Site 3		14.8 ± 0.06	110
	Site 4		17.6 ± 0.03	115
Ni (II)	Site 1	10	31.2 ± 0.12	125
	Site 2		35.3 ± 1.3	111
	Site 3		28.9 ± 0.7	117
	Site 4		30.4 ± 0.01	110
ICP-MS	Site 1, Se	10	27.5 ± 0.037	120
	Site 2, Ni		32.2 ± 0.075	111