Table 1. Rate constants, as determined from the experiments.

	c3	c4	c5	c6
Clay	0.350	0.367	0.141	0.141
NH4Cl	0.012	0.129	0.429	0.429
DMPC	0.273	0.149	0.289	0.289
Film	0.271	0.425	0.343	0.343

Rate constants c₃, c₄, c₅ and c₆, as determined from the integrated peak intensities in Fig. 4. The constants were calculated using Eq. (4).