Table II.

Test of Precision

Parameters	Intraday assay			Interday assay
Concentration taken (μg ml−1)	0.160	0.400	0.800	0.16	0.400	0.800
Concentration found (μg ml−1)	0.160	0.401	0.800	0.1601	0.401	0.800
Standard deviationa (μg ml−1)	0.001	0.001	0.002	0.001	0.001	0.002
Recovery (%)	100.02	100.20	100.01	100.05	100.20	100.02
RSD (%)	0.58	0.32	0.23	0.59	0.33	0.25

^aMean for five independent determinations