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

Table 5

Determination of the recovery rate for cobalt (II) in 0 hours irradiated (Original Sample), 6 and 12 hours solar UV irradiated (SoUV Sample), and 6 hours artificial UV irradiated (UV Sample).

Cobalt	Concentration before spiking (ppb)	Spiked concentration (ppb)	Concentration after spiking (ppb)	Recovered concentration (ppb)	Recovery rate (%)
Original	0.00	8.00	3.60	3.60	45.00
6 hrs SoUV	0.00	2.00	1.30	1.30	65.00
12 hrs SoUV	0.00	2.00	1.45	1.45	72.50
UV	0.33	2.00	2.06	1.73	86.50
Blank	0.00	2.00	2.05	2.05	102.34