Statistic evaluation of Grubbs test.

Extracting agent	Analyte	Measured values (μg L−1)			Mean values (μg L−1)	S
Acetonitrile	Diazepam	0.6815	0.6805	0.5865	0.6495	0.0546
	Chlorpromazine	0.7504	0.7380	0.7754	0.7546	0.0191
	Clozapine	0.6538	0.6056	0.5822	0.6139	0.0365
	Triazolam	0.9757	1.0285	1.0288	1.0110	0.0306
	Alprazolam	0.8055	0.7751	0.7252	0.7686	0.0405
	Estazolam	0.8216	0.7757	0.8529	0.8167	0.0388
Methylalcohol	Diazepam	0.7682	0.7534	0.7085	0.7434	0.0310
	Chlorpromazine	1.0066	1.0410	1.0185	1.0220	0.0175
	Clozapine	0.7550	0.7915	0.8210	0.7892	0.0331
	Triazolam	0.6932	0.7898	0.8028	0.7619	0.0599
	Alprazolam	0.6457	0.8945	0.7214	0.7539	0.1275
	Estazolam	0.8405	0.8199	0.7722	0.8109	0.0350
0.1% formic acid acetonitrile water	Diazepam	0.8734	0.8580	0.8917	0.8744	0.0169
	Chlorpromazine	1.0212	0.9868	0.9669	0.9916	0.0275
	Clozapine	0.8882	0.8519	0.8607	0.8669	0.0189
	Triazolam	1.0403	0.9919	0.9616	0.9980	0.0397
	Alprazolam	1.0036	0.9878	1.0052	0.9989	0.0010
	Estazolam	0.9381	0.9704	0.9900	0.9661	0.0262