Journal of Analytical Science and Technology

Table 1 The CCD experimental design and the resultant % ER

From: Vortex-assisted supramolecular solvent dispersive liquid–liquid microextraction of ketoprofen and naproxen from environmental water before chromatographic analysis: response surface methodology optimisation

Run	pH	CS	SV	KET	NAP
1	4	1500	100	92.0	82.9
2	4	1500	800	96.0	102.9
3	4	3500	100	82.0	85.7
4	4	3500	800	88.0	101.7
5	9	1500	100	80.6	88.6
6	9	1500	800	82.5	85.7
7	9	3500	100	71.3	74.3
8	9	3500	800	75.0	91.4
9	3.3	2500	450	93.1	102.9
10	9.7	2500	450	65.3	87.8
11	6.5	1213	450	93.6	96.4
12	6.5	3787	450	91.5	86.8
13	6.5	2500	− 0.5	0.0	0.00
14	6.5	2500	900	95.9	96.5
15	6.5	2500	450	100.2	99.6
16	6.5	2500	450	98.0	102.9

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