Table 1.

Position of the main peaks in FTIR spectra of sodium alginate gel before adsorption, after adsorption of As(III), Pb(II), and Zn(II).

Wavenumber before sodium alginate gel adsorption (cm−1)	Wavenumber after sodium alginate gel adsorption (cm−1)			Assignment
	As(III)	Pb(II)	Zn(II)
3440	3440	3443	3439	−OH stretching vibration
2924	2922	2922	2922	−CH stretching vibration
1617	1637	1638	1628	C=O stretching vibration
1420	1420	1420	1420	C−H bending vibration
1031	1027	1027	1027	C−O stretching vibration
876	876	877	877	C−H bending vibration