Table 3.

Precision data for the determination of GEF in water and plasma samples by the proposed method.

		Intra-Day Precision			Inter-Day Precision
		Conc. Taken (ng/mL)	Conc. Found (ng/mL)	% Found	Conc. Taken (ng/mL)	Conc. Found (ng/mL)	% Found
Water samples		50.00	50.62	101.24	50.00	50.62	101.24
		150.00	151.99	101.33	150.00	152.63	101.75
		300.00	299.97	99.99	300.00	299.76	99.92
	$\overline{X}$ ± SD	100.85 ± 0.75			100.95 ± 0.94
	%RSD	0.75			0.94
	%Error	0.43			0.54
Plasma samples		150.00	147.76	98.51	150.00	149.86	99.91
		450.00	454.54	101.01	450.00	452.43	100.54
		600.00	596.94	99.49	600.00	584.16	97.36
	$\overline{X}$ ± SD	99.67 ± 1.26			99.27 ± 1.70
	%RSD	1.26			1.70
	%Error	0.73			0.98

N.B. Each result is the average of three separate determinations.