Table 3.

Robustness and ruggedness studies of the developed method.

Robustness (SD)*
Factor	Guaiacol	4-Aminophenol	Paracetamol	Guaifenesine	Sodium benzoate	Oxomemazine
1- amount of the used buffer (±0.05 mL)	0.45	1.03	1.10	0.89	1.34	1.15
2- saturation time (±5 min)	0.62	0.98	0.35	0.25	1.25	0.94
Ruggedness (SD)*
1-Two analysts	0.12	0.09	0.46	0.29	0.19	0.15

^*SD: SD of the change in Rf value of each component.