Carbonized Aramid Fiber as the Adsorbent for In-Tube Solid-Phase Microextraction to Detect Estrogens in Water Samples

Table 2

Analytical performances of the in-tube SPME-HPLC method for the detection of five estrogens.

Analytes	LODs (μg/L)	LOQs (μg/L)	Linear ranges (μg/L)	r^2a	Enrichment factors^b	Extraction repeatability (n = 3, RSD %)^c		Preparation repeatability (n = 3, RSD %)^d
						Intraday	Interday
Bisphenol A	0.027	0.089	0.5–10.0	0.9915	178	4.8	1.8	2.3
Ethynyl estradiol	0.017	0.055	0.5–10.0	0.9939	734	0.6	1.1	1.1
Diethylstilbestrol	0.011	0.038	0.5–10.0	0.9962	1335	1.1	1.0	1.9
Hexestrol	0.13	0.45	0.5–10.0	0.9906	634	2.3	2.1	9.2
Estrone	0.061	0.20	0.5–10.0	0.9941	750	1.7	4.0	3.9

^aCalibration level: n = 3. ^bEnrichment factors were obtained by extracting 10 μg/L standard solution of estrogen under the optimized conditions. ^cExtraction repeatability was investigated by extracting standard solution spiked at 10 μg/L of estrogens three times. ^dPreparation repeatability was investigated by extracting standard solution spiked at 10 μg/L of estrogens with three extraction tubes.