Effect of concentration on uptake of some trace metals by plants

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Abstract
The uptake by plants [bush bean] of some trace metals [threshold toxicity levels and food chain relationships] at different concentrations was related closely to the decay constant, ln2. This means that for a 10-fold increase in applied concentration, the increase in uptake was close to 4.93 (100.693 = 4.93). With some trace metals the value of Y (10Y = ratio of uptake) for 10-fold increase in metal concentration was around 1. For generalized conditions the value of Y in the expression, (C1/C2)Y = uptake ratio, for different concentrations C1 and C2 varied around ln2. Some values of Y for whole plants were Ni, 0.699 with C.V. (coefficient of variation) 12.2%, Cu, 0.468 with C.V. 12.1%, Zn, 0.606 with C.V. 31.5%, and Cd, 0.903 with C.V. 10.9%. From soil the values for shoots for Co were 0.855 (C.V. = 14.8%) without EDTA (ethylenediamine tetraacetic acid) and 0.941 (C.V. = 20.8%) with EDTA; for Cu with EDTA it was 0.562 (C.V. = 25.8%) with EDTA; for Cu with EDTA it was 0.562 (C.V. = 25.8%).