Table 9.

Repeatability test data for determination of aconitine (data obtained from spiked samples)

	Control samples
Spike levela	AC-C-1 (Day 1)	AC-C-2 (Day 2)	AC-C-3 (Day 3)	Meanb	Swc	RSDrd, %	RSDr(cal)e, %	HorRatf
Low	2.113	2.093	2.119	2.179	0.11	4.82	7.07	0.68
	2.090	2.267	2.103
	2.174	2.312	2.342
Intermediate	4.376	4.332	4.176	4.450	0.19	4.28	6.35	0.57
	4.297	4.441	4.644
	4.617	4.593	4.574
High	9.460	8.762	8.750	9.194	0.25	2.68	5.69	0.47
	9.696	9.073	9.015
	9.375	9.269	9.346

^aSpike level: low = ca 2.5 μg/g, intermediate = ca 5.0 μg/g, and high = ca 10 μg/g.

^bMean concentration obtained from 9 determinations (triplicates × 3 matrixes).

^cS_w = Estimate of standard deviation within day.

^dRSD_r = Relative standard deviation = S_w/mean in percentage.

^eRSD_r(cal) = Percentage predicted repeatability standard deviation = C^−0.15; C = estimated mean concentration expressed as a decimal fraction.

^fHorRat = RSD_r/RSD_r(cal).