Biosorption of Cr(III) and Pb(II) by Schoenoplectus californicus and Insights into the Binding Mechanism

Table 5

Effects of various chemical agents (0.1 M) on the desorption of Cr(III) and Pb(II) from the metal-loaded-pH biomass of S. californicus.

Desorbing agent	Percentage of desorption
	Chromium (III)		Lead (II)
	pH 5	pH 7	pH 5	pH 7
Distilled water	0,30 ± 0,07	0,08 ± 0,02	0,33 ± 0,08	0,44 ± 0,28
HNO3	2,27 ± 0,10	1,46 ± 0,23	90,04 ± 4,21	77,08 ± 1,88
NaOH	10,04 ± 0,57	1,03 ± 0,02	8,71 ± 0,23	14,50 ± 0,69
MgCl2	0,43 ± 0,09	0,08 ± 0,01	5,02 ± 2,55	9,52 ± 0,32
EDTA	3,13 ± 0,23	0,94 ± 0,30	87,99 ± 2,05	75,47 ± 1,86