Solar UV-Assisted Pretreatment of River Water Samples for the Voltammetric Monitoring of Nickel and Cobalt Ultratraces

Table 2

Experimental result for nickel (II) in 0 hours irradiated (Original Sample), 6 and 12 hours solar UV irradiated (SoUV Sample), and 6 hours artificial UV irradiated (UV Sample).

	Nickel
	Original Sample	SoUV Sample		UV Sample
	0 hrs	6 hrs	12 hrs	6 hrs
Concentration (𝜇gL^−1)	1.66±0.06	2.12±0.10	2.62±0.06	2.71±0.02
Recovery rate (%)	87.80±0.95	90.80±0.55	95.20±0.43	99.00±0.42
Blank recovery rate (%)	100.48±0.20