Table 16.

Negative control recovery

Test sample identification	Replicate	Spike concn, μg/g	Amt of aristolochic acid found, μg/g	Recovery, %	Mean recovery, %	SDa	RSDrb
Day 1
S. tetrandra root spiked 2 μg/g	1	2.020	2.032	101	100	0.854	0.854
	2	2.020	2.006	99.3
	3	2.020	2.025	100
S. tetrandra root spiked 1 0 μg/g	1	10.02	10.27	102	102	0.577	0.566
	2	10.02	10.35	103
	3	10.02	10.19	102
S. tetrandra root spiked 30 μg/g	1	29.96	31.36	105	104	1.00	0.962
	2	29.96	31.01	104
	3	29.96	30.71	103
Day 2
S. tetrandra root spiked 2 μg/g	1	2.020	2.065	102	103	1.53	1.49
	2	2.020	2.072	103
	3	2.020	2.118	105
S. tetrandra root spiked 10 μg/g	1	10.02	10.57	105	103	2.00	1.94
	2	10.02	10.17	101
	3	10.02	10.37	103
S. tetrandra root spiked 30 μg/g	1	29.96	31.24	104	104	1.00	0.962
	2	29.96	31.44	105
	3	29.96	30.77	103
Day 3
S. tetrandra root spiked 2 μg/g	1	2.024	1.991	98.4	101	5.92	5.86
	2	2.024	1.968	97.2
	3	2.024	2.190	108
S. tetrandra root spiked 10 μg/g	1	10.07	10.51	104	103	0.577	0.560
	2	10.07	10.33	103
	3	10.07	10.34	103
S. tetrandra root spiked 30 μg/g	1	30.00	31.34	104	1 04	NAc	NA
	2	30.00	31.11	104
	3	30.00	31.19	104

^aSD = Standard deviation.

^bRSD_r = % Relative standard deviation, intralaboratory precision.

^cNA= Not applicable.