The Effect of Chloride and Sulfate Ions on the Adsorption of Cd²⁺ on Clay and Sandy Loam Egyptian Soils

Table 1

Characteristics and mineralogical analysis of the experimental soils.

Parameters	Alluvial soil	Calcareous soil
Texture of <0.5 mm:
% sand (0.02–0.5 mm)	12.10	62.70
% silt (0–20 µm)	31.60	25.60
% clay (2 µm)	56.30	11.70
% calcium carbonate	2.14	21.80
% organic matter	1.75	0.30
CEC (meq/100 g soil)	48.20	8.70
Specific surface area (m^2/g) (O.P. method)	233.80	87.60
Cd content (µg/g) (hot 1 : 1 HNO3 for 6 hrs)	0.36	0.06
Mineralogical analysis
% montmorillonite	51.50	14.20
% kaolinite	15.00	17.20
% mica	7.50	26.30
% vermiculite	5.00	—
% attapulgite	—	22.00
% quartz	4.00	4.00
% feldspar	3.00	3.50
% free oxides	14.00	12.80