Table 2.

Determination of Co²⁺ ions in water samples.

Water sample	Spiked (µM)	UV–Vis		ICP-MS
		Found (µM)	Recovery (%)	Found (µM)	Recovery (%)
Control	35	35.59	101.68	35.53	100.51
Distilled water	35	35.67	101.92	35.06	100.17
Tap water	35	36.27	103.64	35.35	101.00
Lake water	35	35.84	102.39	35.41	101.60
Mangrove water	35	35.05	100.13	35.28	100.80
Sea water	35	35.76	102.17	35.38	101.08
River water	35	35.62	101.77	35.44	101.26