Table 4. Recoveries (%) and RSDs (%) of F, FD, FS, and FSO at 3 spiking levels by UHPLC-MS/MS (n=6)

Pesticide name	Spiked levels	1 μg/kg		10 μg/kg		20 μg/kg
	Replicates	Measured value (μg/kg)	Average recoveries (%)	Measured value (μg/kg)	Average recoveries (%)	Measured value (μg/kg)	Average recoveries (%)
Fipronil (F)	1	0.97	97.00	10.32	103.20	19.36	96.80
	2	0.92	92.00	9.91	99.10	18.09	90.45
	3	0.91	91.00	9.55	95.50	19.49	97.45
	4	0.99	99.00	9.66	96.60	18.86	94.30
	5	0.90	90.00	9.82	98.20	18.64	93.20
	6	0.96	96.00	9.05	90.50	19.10	95.50
	Mean value	0.94	94.17	9.72	97.18	18.92	94.62
	RSDs (n=6) (%)	3.88		4.34		2.72
	Recovery range (%)	90.00–99.00		90.50–103.20		90.45–97.45
Fipronil desulfinyl (FD)	1	1.03	103.00	10.44	104.40	18.90	94.50
	2	1.02	102.00	10.16	101.60	18.32	91.60
	3	0.95	95.00	9.58	95.80	18.80	94.00
	4	0.90	90.00	10.10	101.00	19.60	98.00
	5	1.02	102.00	10.10	101.00	19.06	95.30
	6	1.03	103.00	9.29	92.90	19.14	95.70
	Mean value	0.99	99.17	9.95	99.45	18.97	94.85
	RSDs (n=6) (%)	5.46		4.27		2.22
	Recoveries range (%)	90.00–103.00		95.80–104.40		91.60–98.00
Fipronil sulfide (FS)	1	0.91	91.00	9.39	93.90	20.00	100.00
	2	1.00	100.00	10.22	102.20	17.91	89.55
	3	0.90	90.00	10.01	100.10	18.58	92.90
	4	1.00	100.00	8.91	89.10	19.17	95.85
	5	0.91	91.00	9.64	96.40	18.83	94.15
	6	1.03	103.00	9.01	90.10	19.03	95.15
	Mean value	0.96	95.83	9.53	95.30	18.92	94.60
	RSDs (n=6) (%)	6.03		5.54		3.65
	Recovery range (%)	90.00–103.00		89.10–102.20		89.55–100.00
Fipronil sulfone (FSO)	1	0.94	94.00	10.25	102.50	17.94	89.70
	2	0.90	90.00	10.43	104.30	20.05	100.25
	3	0.98	98.00	9.58	95.80	19.47	97.35
	4	0.90	90.00	10.01	100.10	19.38	96.90
	5	0.90	90.00	9.58	95.80	19.62	98.10
	6	0.89	89.00	9.43	94.30	18.10	90.50
	Mean value	0.92	91.83	9.88	98.80	19.09	95.47
	RSDs (n=6) (%)	3.80		4.15		4.53
	Recoveries range (%)	89.00–98.00		94.30–104.30		89.70–100.25

UHPLC-MS/MS, ultra high performance liquid chromatography coupled with mass spectrometry.