Determination of Residual Nonsteroidal Anti-Inflammatory Drugs in Aqueous Sample Using Magnetic Nanoparticles Modified with Cetyltrimethylammonium Bromide by High Performance Liquid Chromatography

Table 3

Determination of the INDO in wastewater and INDO, IBU in urine samples.

Sample	INDo	IBu
(1) Inlet of wastewater
Initial concentration (𝜇g·L^−1)	1.91	—
RSD%	6.41	—
(2) Inlet of wastewater; (25 𝜇g·L^−1 of the drug was added)
Found	25.83	—
RSD%	5.24	—
Preconcentration factor	38.39	—
(3) Outlet of wastewater
Initial concentration (𝜇g·L^−1)	—
(4) Outlet of wastewater; (25 𝜇g·L^−1 of the drug was added)
Found	24.71	—
RSD%	4.93	—
Preconcentration factor	39.53	—
(5) Urine (patient); (100 𝜇g·L^−1 of the drugs was added)
Initial concentration (𝜇g·L^−1)	10.10	689.89
Found	107.61	751.37
RSD %	4.11	1.70
Preconcentration factor	39.09	38.05
(6) Urine; (100 𝜇g/Lit of the drug was added)
Initial concentration	—	—
Found	100.07	97.45
RSD%	4.66	3.93
Preconcentration factor	40.02	38.98