Table II.

Copper, cadmium, and mercury concentrations in metal-treated plants

Treatment Time	Copper		Cadmium	Mercury
	1 μm	10 μm	10 μm	10−2 μm	1 μm	5 μm
2 d (Control)	18.0a	15.7a	3.3a	0.4a	0.2a	0.3a
2 d (Treated)	27.9b	80.2c	302.9b	40.8b	252.0c	400.8d
15 d (Control)	–	–	–	0.4a	0.5a	0.2a
15 d (Treated)	–	–	–	50.3b	290.0c	635.8e

Cu₂₊, Cd₂₊ and Hg₂₊ levels (μg/g dry wt) measured in P. oceanica leaves from plants experienced, at laboratory conditions, with different metals and metals concentrations, independently. For each metal, means followed by the same letter are not significantly different at the 5% level with Tukey's ranking test.