Table 3.

Kinetic parameters for release data.

Medium	Particle Diffusion Controlled Model		Film Diffusion Controlled Model
	Equation	r	Equation	r
0.4 M KH2PO4	−ln(1 − F) = 0.5870 t0.65 − 0.2382	0.9967	−ln(1 − F) = 0.1749 t + 0.5812	0.9996
Phosphate Buffer, pH4.5	−ln(1 − F) = 0.2911 t0.65 − 0.1240	0.9993	−ln(1 − F) = 0.0713 t + 0.4251	0.9924
Acetate Buffer, pH4.5	−ln(1 − F) = 0.2662 t0.65 − 0.1891	0.9997	−ln(1 − F) = 0.0653 t + 0.3120	0.9940
Hydrochloric Acid, pH1.0	−ln(1 − F) = 0.2811 t0.65 + 0.3077	0.9933	−ln(1 − F) = 0.0684 t + 0.8453	0.9794