Solar UV Photooxidation as Pretreatment for Stripping Voltammetric Trace Metal Analysis in River Water

Table 2

Concentration and recovery rates measured for Zn, Cd, Pb, and Cu in Original Sample, SoUV Sample and UV Sample of Warnow River.

Element	Concentration (ppb)			Recovery rate
	Original sample	SoUV sample	UV sample	Original sample	SoUV sample	UV sample(%)
Zinc	17.17±0.43	22.86±0.41	26.67±0.40	88.81±0.20	95.91±0.13	92.90±0.21
Cadmium	0.03±0.001	0.05±0.003	0.05±0.005	75.32±0.15	87.11±0.22	93.66±0.11
Lead	4.36±0.05	7.07±0.02	7.50±0.01	84.21±0.32	90.32	94.14±0.31
Copper	32.20±0.34	58.85±0.31	73.57±0.28	133.59±0.42	112.75±0.37	104.16±0.35