Table 3. Comparison of 4 types of clean-up columns in terms of recovery, matrix effect, solvents and time consumption

Cleanup methods		HLB	Envi-Carb-NH2	QuEChERS	SinChERS
Recoveries (%)	F	76	70	92	100
	FD	85	73	94	99
	FS	77	68	89	88
	FSO	74	69	95	97
Matrix effect (%)	F	−1.00	−4.40	−2.70	1.10
	FD	17.60	7.60	11.40	10.60
	FS	20.40	6.90	16.30	16.20
	FSO	19.30	8.70	14.50	13.40
Solvent consumption		Acetonitrile 130 mL	Acetone 40 mL, dichloromethane 30 mL	Acetonitrile 10 mL	Acetonitrile 10 mL
Time spent (h)		4.5	6.5	2.0	1.5

F: fipronil; FD, fipronil desulfinyl; FS, fipronil sulfide; FSO, fipronil sulfone; QuEChERS, quik-easy-cheap-effective-rugged-safe method; SinChERS, single-step, cheap, effective, rugged, safe-based method.