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pH-Dependent Release of Cadmium, Copper, and Lead from Natural and Sludge-Amended Soils

Orathai Sukreeyapongsea, Peter E. Holmb, Bjarne W. Strobelb, Supamard Panichsakpatanaa, Jakob Magidb and Hans Christian Bruun Hansen*,b

a Dep. of Soil Science, Kasetsart University, Phaholyathin, Chatujak, Bangkok, 10900, Thailand
b Dep. of Agricultural Sciences, The Royal Veterinary & Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark



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  		Fig. 1. Examples of change in pH ({diamond}), flow rate (+), and dissolved organic carbon (DOC) concentration (x) vs. time and the corresponding variation in effluent concentrations for Cd ({blacktriangleup}), Cu (•), and Pb ({square}) in release experiments with Danish (a, c) and Thai soils (b, d) (Experiment D1 run at pH 3.5 and T1 at pH 3.0).

 


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  		Fig. 2. Example of linear regression of accumulated release vs. time data and the estimates of initial release and release rate obtained from this analysis. Sample D1 at pH 3.7. Cd {blacktriangleup}, Cu •, Pb {square}.

 


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  		Fig. 3. Relative release rates (ri, rel) vs. pH for Cd (a), Cu (b), and Pb (c). D1 {circ}, D2 •, T1 {triangleup}, and T2 {blacktriangleup}, where D is Danish and T is Thai. Relative release rates are calculated by use of Eq. [5]. Solid lines are drawn as a guide to the eye.

 




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