Table 4.

Recoveries and accuracy for caffeine, ibuprofen and carbamazepine in 200 mL of spiked tap waters and river waters.

Matrix and Spiked Concentration	Theoretical concentration [ng/L]	Mean Measured Concentration (n = 3) [ng/L]	Recovery (n = 3) [%]
	Caffeine (CAF)
Tap water matrix		0.05 ± 0.01
Tap water + 1 ng	1.05	1.46 ± 0.04	138.94
Tap water + 5 ng	5.05	4.54 ± 0.12	89.79
Tap water + 10 ng	10.05	9.82 ± 0.26	97.75
Wisła matrix		75.42 ± 1.98
Wisła + 10 ng	85.42	85.60 ± 2.24	99.79
	Ibuprofen (IBU)
Tap water matrix		ND
Tap water + 1 ng	1.00	1.60 ± 0.050	159.52
Tap water + 5 ng	5.00	5.61 ± 0.17	112.14
Tap water + 10 ng	10.00	10.74 ± 0.33	107.41
Wisła matrix		19.06 ± 0.59
Wisła + 10 ng	29.06	29.01 ± 0.90	100.16
	Carbamazepine (CBM)
Tap water matrix		0.96 ± 0.03
Tap water + 1 ng	1.96	1.52 ± 0.04	77.38
Tap water + 5 ng	5.96	5.60 ± 0.16	93.94
Tap water + 10 ng	10.96	11.07 ± 0.32	101.05
Wisła matrix		47.21 ± 1.34
Wisła + 10 ng	57.21	55.55 ± 1.58	103.00