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

Table 3

Analytical results of real water samples collected during shutdown of factory.

Sample	On-site collection of samples	Added in sample, µg/L	Determined in sample µg/L	Recovery (%)
Se (IV)	Site 1	10	11.2 ± 0.05	110
	Site 2		9.25 ± 0.07	92
			18.5 ± 0.03	111
			17.4 ± 0.01	113
Ni (II)	Site 2	10	10.6 ± 0.05	100
	Site 4		10.3 ± 0.04	101
ICP-MS	Site 2, Se	10	15.8 ± 0.56	105
	Site 4, Ni		16.7 ± 0.12	107