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Contamination Time Effect on Lead and Cadmium Fractionation in a Tropical Coastal Clay

Teik-Thye Lim*,a, Joo-Hwa Taya and Cee-Ing Tehb

a Div. of Environ. and Water Resources Eng., School of Civil and Environ. Eng., Nanyang Technol. Univ., Nanyang Ave., Singapore 639798
b Div. of Geotech. and Transp. Eng., School of Civil and Environ. Eng., Nanyang Technol. Univ., Nanyang Ave., Singapore 639798



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  		Fig. 1. Changes of Pb retention in various fractions of clay with time: (a) exchangeable, (b) carbonate, (c) reducible, (d) organic, and (e) residual fractions.

 


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  		Fig. 2. Lead fractions in clay after sorption in 0.05 M CaCl2 medium: (a) 1-d sorption period, and (b) 65-d sorption period.

 


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  		Fig. 3. Changes of Cd retention in various fractions of clay with time: (a) exchangeable, (b) carbonate, (c) reducible, (d) organic, and (e) residual fractions.

 


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  		Fig. 4. Cadmium fractions in clay after sorption in 0.05 M CaCl2 medium: (a) 1-d sorption period, and (b) 65-d sorption period.

 


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  		Fig. 5. Measured amounts of metals released into dissolved phase at the end of sorption periods up to 65 d: (a) Al, (b) Si, (c) Mg, and (d) Fe.

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.