Chemically modified mesoporous silica as a coating layer of solid-phase microextraction for determination of benzo[a]pyrene in water samples

Phenyl-functionalized mesoporous silica was synthesized and employed as the coating layer of solid-phase microextraction (SPME) for the determination of trace amount of benzo[a]pyrene (B[a]P) in water samples coupling to high-performance liquid chromatography (HPLC) for the first time. The performance of the fiber coating was examined by the effect of extraction time, desorption time, temperature, stirring rate, and ionic strength. Under the experimental conditions, the chromatographic peak area is proportional to the concentration of B[a]P in the range 1.00 x 10(-9) to 1.00 x 10(-6) mol (.) L-1. The limit of detection is 1.10 x 10(-10) mol (.) L-1 (S/N = 3). The analytical results of water samples show that the recovery was 86.50 similar to 106.67% and relative standard deviation was 1.80 similar to 2.45%. As compared with conventional loop injection of HPLC, SPME with mesoporous silica coating is convenient, sensitive, and suitable for the determination of B[a]P in water samples. It also indicates that chemically modified mesoporous silica is a novel alternative coating of SPME.