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. 2010 Nov 30;155(2):808–820. doi: 10.1104/pp.110.165985

Table III. Comparison of three models for ion toxicity.

For the FIAM, toxicity is expressed in terms of the activity in the bulk-phase rooting medium according to the equation RRE = 100/exp[(α{M}b)β]. For the SIAM, toxicity is expressed in terms of the activity at the PM exterior surface according to the equation RRE = 100/exp[(α{M}0o)β]. For the ETM, toxicity is expressed in terms of the PM surface activity and electrical potentials (ψ0o) according to the equation RRE = 100/exp{[α(1 + bψ0o){M}0o]β}. {M} refers to one of the ions below; α, β, and b are coefficients: α is a strength coefficient and β is a shape coefficient. All of the presented values for coefficients are statistically significant (95% confidence intervals do not encompass 0). All activities are expressed in μm.

Ion Experiment No. α β b n r2
FIAM
 Cu2+ 11 0.933 1.29 45 0.843
 Cu2+ 12 1.69 0.901 51 0.745
 Cu2+ 13 1.72 2.32 36 0.654
 Al3+ 14 0.227 1.21 50 0.660
 H2AsO4 15 0.456 1.95 100 0.903
SIAM
 Cu2+ 11 0.040 0.781 45 0.749
 Cu2+ 12 0.122 0.639 51 0.878
 Cu2+ 13 0.312 1.88 36 0.835
 Al3+ 14 0.143 3.26 50 0.919
 H2AsO4 15 1.82 1.57 100 0.919
ETM
 Cu2+ 11 0.210 1.43 0.0187 45 0.956
 Cu2+ 12 0.281 0.908 0.0143 51 0.921
 Cu2+ 13 0.552 2.36 0.0186 36 0.889
 Al3+ 14 0.155 3.63 0.0164 50 0.949
 H2AsO4 15 0.628 1.94 −0.0607 100 0.937