Application of response surface methodology for optimization of metal–organic framework based pipette-tip solid phase extraction of organic dyes from seawater and their determination with HPLC

Table 4 Recovery results for real sample achieved from several points of Chabahar Bay (Iran)

Analyte added	Sampling location	Recovery % at spiked level of 10 (µg/L)	Dyes found (µg/L)	RSD (%)^b
RB	Station 1, Tis^a	–	1.56	0.7
	Station 1, Tis	94.4	11.00	2.6
	Station 2, Lypar^a	–	1.67	3.4
	Station 2, Lypar	95.6	11.23	3.6
	Station 3, Chabahar Maritime University^a	–	1.96	2.4
	Station 3, Chabahar Maritime University	93.6	11.32	4.6
	Station 4, Konarak^a	–	1.44	1.9
	Station 4, Konarak	88.8	10.32	1.7
	Station 5, Kalantary^a	–	2.77	1.3
	Station 5, Kalantary	91.1	11.88	2.6
MG	Station 1, Tis^a	–	1.12	0.66
	Station 1, Tis	90.4	10.16	0.63
	Station 2, Lypar^a	–	1.35	3.5
	Station 2, Lypar	96.8	11.03	4.0
	Station 3, Chabahar Maritime University^a	–	1.65	3.9
	Station 3, Chabahar Maritime University	98.7	11.52	3.0
	Station 4, Konarak^a	–	1.89	3.9
	Station 4, Konarak	96.5	11.54	2.8
	Station 5, Kalantary^a	–	3.45	2.5
	Station 5, Kalantary	99.6	13.41	4.0
MO	Station 1, Tis^a	–	1.20	4.5
	Station 1, Tis	78.3	9.03	1.9
	Station 2, Lypar^a	–	1.14	5.3
	Station 2, Lypar	95.0	10.64	4.8
	Station 3, Chabahar Maritime University^a	–	1.87	4.6
	Station 3, Chabahar Maritime University	86.8	10.55	2.5
	Station 4, Konarak^a	–	1.26	3.4
	Station 4, Konarak	97.8	11.04	2.1
	Station 5, Kalantary^a	–	3.02	3.1
	Station 5, Kalantary	96.4	12.66	6.4
AR	Station 1, Tis^a	–	1.34	0.8
	Station 1, Tis	97.2	11.06	0.7
	Station 2, Lypar^a	–	1.28	1.2
	Station 2, Lypar	97.3	11.01	1.0
	Station 3, Chabahar Maritime University^a	–	1.98	2.8
	Station 3, Chabahar Maritime University	95.9	11.57	3.0
	Station 4, Konarak^a	–	1.42	2.5
	Station 4, Konarak	93.0	10.72	2.3
	Station 5, Kalantary^a	–	2.87	5.6
	Station 5, Kalantary	78.5	10.72	6.3