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Table 2

Parameters of the sorption isotherms for metals onto the three soil materials

Copper
Zinc
R2nR2R2aR2
L·kg−1 mg1-n·kg1·Ln mg·kg1L·mg1 L·kg−1 
Soil 1 Ref. 9.8·103 0.98 950 0.54 0.99 1,400 2.05 0.95 2.7·103 0.88 
NaCl 1.4·104 0.96 730 0.45 0.99 1,080 2.58 0.97 1.9·103 0.80 
HAb 7.7·103 0.96 650 0.36 0.94 910 4.04 0.97 2.1·103 0.80 
Soil 2 Ref. 9.4·103 0.98 1,280 0.41 0.99 1,240 8.14 0.95 1.3·104 0.66 
Soil 3 Ref. 6.0·103 0.99 2,390 0.59 0.99 2,790 2.85 0.99 6.8·103 0.92 
NaCl 6.1·103 0.96 1,940 0.62 0.99 2,460 2.20 0.99 3.8·103 0.90 
HAb 4.8·103 0.99 1,690 0.54 0.99 1,950 3.28 0.99 4.2·103 0.88 
Copper
Zinc
R2nR2R2aR2
L·kg−1 mg1-n·kg1·Ln mg·kg1L·mg1 L·kg−1 
Soil 1 Ref. 9.8·103 0.98 950 0.54 0.99 1,400 2.05 0.95 2.7·103 0.88 
NaCl 1.4·104 0.96 730 0.45 0.99 1,080 2.58 0.97 1.9·103 0.80 
HAb 7.7·103 0.96 650 0.36 0.94 910 4.04 0.97 2.1·103 0.80 
Soil 2 Ref. 9.4·103 0.98 1,280 0.41 0.99 1,240 8.14 0.95 1.3·104 0.66 
Soil 3 Ref. 6.0·103 0.99 2,390 0.59 0.99 2,790 2.85 0.99 6.8·103 0.92 
NaCl 6.1·103 0.96 1,940 0.62 0.99 2,460 2.20 0.99 3.8·103 0.90 
HAb 4.8·103 0.99 1,690 0.54 0.99 1,950 3.28 0.99 4.2·103 0.88 

aInitial slope of the isotherm, calculated from the first 4–5 points.

bFitted values for the isotherms in the presence of humic acids.

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