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Table 2 Rate constant, half time, and correlation coefficient ( r 2 ) value

From: 3,4-Dichlorophenoxyacetate interleaved into anionic clay for controlled release formulation of a new environmentally friendly agrochemical

Aqueous solution (0.005 M) Zeroth-order r2 First-order r2 Parabolic diffusion Pseudo-second-order
(3,000 min) (3,000 min) r 2 k(×10−3) c r 2 t1/2(min) k(×10−4) c
Na3PO4 0.315 0.549 0.390 15.50 0.797 1.000 39 2.458 0.698
Na2CO3 0.567 0.621 0.738 5.99 0.254 0.999 66 2.424 0.391
Na2SO4 0.215 0.228 0.340 4.32 0.717 0.999 74 2.235 1.360
NaCl 0.322 0.336 0.494 5.90 1.640 0.959 78 2.146 1.470
  1. Obtained from the fitting of the data from 0 to 3,000 min of 3,4-D in the LDH interlayer into the aqueous solution containing various anions, phosphate, carbonate, sulfate, and chloride, by first-order, parabolic diffusion, and pseudo-second-order kinetics models.