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Table 3 The contents of Cd2+ and Zn2+ in soil colloid particles and corresponding supernatant, the binding energies of Cd2+ and Zn2+ on different soil colloid particles at various ratio of Cd2+ and Zn2+, related parameters to calculate the binding energy

From: Wien effect of Cd/Zn on soil clay fraction and their interaction

Cd2+/Zn2+ Soil type EC0 (mS cm−1) Metal in colloid particles (mmol kg−1) ECiu (mS cm−1) Metal in supernatant (mmol L−1) ECi0 (mS cm−1) Gbi (kJ mol−1)
Cd2+ Zn2+ Cd2+ Zn2+ Cd2+ Zn2+ Cd2+ Zn2+ Cd2+ Zn2+
1:1 Boggy soil 0.0088 75.24 79.17 0.0813 0.0836 0.0126 0.0175 0.0037 0.0051 7.64 6.95
Paddy soil 0.0129 60.21 61.84 0.0650 0.0653 0.0445 0.0444 0.0065 0.0064 5.70 5.77
Yellow brown soil 0.0079 62.68 64.03 0.0677 0.0676 0.0124 0.0117 0.0041 0.0038 6.95 7.15
Yellow drab soil 0.0122 66.45 69.14 0.0718 0.0730 0.0835 0.0861 0.0061 0.0061 6.12 6.15
1:3 Boggy soil 0.0125 42.91 127.56 0.0463 0.1347 0.0013 0.0064 0.0021 0.0104 7.66 6.35
Paddy soil 0.0128 33.74 92.28 0.0364 0.0974 0.0055 0.0182 0.0030 0.0098 6.17 5.70
Yellow brown soil 0.0111 37.51 107.95 0.0405 0.1140 0.0076 0.0241 0.0027 0.0084 6.72 6.47
Yellow drab soil 0.0141 39.37 113.31 0.0425 0.1197 0.0020 0.0086 0.0028 0.0113 6.78 5.84
3:1 Boggy soil 0.0114 127.64 45.69 0.1379 0.0482 0.0074 0.0024 0.0087 0.0027 6.86 7.14
Paddy soil 0.0147 100.78 32.89 0.1088 0.0347 0.0148 0.0046 0.0113 0.0034 5.62 5.76
Yellow brown soil 0.0153 112.25 37.92 0.1212 0.0400 0.0091 0.0025 0.0121 0.0032 5.72 6.23
Yellow drab soil 0.0156 115.42 36.19 0.1247 0.0382 0.0123 0.0033 0.0124 0.0032 5.73 6.12
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