Cadmium uptake kinetics in parts of the seagrass Cymodocea nodosa at high exposure concentrations

Table 3 Regression models tested in those cases in which the Michaelis–Menten-type model did not provide a satisfactory fit to the uptake kinetics data

	Exposure concentration (mg L⁻¹)	Model	r²	F	df₁	df₂	Significance
Rhizomes	5	Linear	0.778	7.003	1	2	0.118
		Logarithmic	0.868	13.130	1	2	0.068
		Inverse	0.815	8.811	1	2	0.097
		Exponential	0.702	4.717	1	2	0.162
		Power	0.917	22.175	1	2	0.042
		S	0.993	292.077	1	2	0.003
Roots	10	Linear	0.945	34.576	1	2	0.028
		Logarithmic	0.802	8.106	1	2	0.104
		Inverse	0.639	3.533	1	2	0.201
		Exponential	0.825	9.429	1	2	0.092
		Power	0.973	73.230	1	2	0.013
		S	0.998	1200.35	1	2	0.001
	20	Linear	0.903	18.599	1	2	0.050
		Logarithmic	0.749	5.972	1	2	0.134
		Inverse	0.602	3.021	1	2	0.224
		Exponential	0.792	7.606	1	2	0.110
		Power	0.954	41.675	1	2	0.023
		S	0.997	581.401	1	2	0.002

The exposure concentrations of 5, 10 and 20 mg L⁻¹ correspond to 44.48, 88.95 and 177.94 μM, respectively

ISSN: 2241-5793