The Influence of pH on Extraction of PAHs in Environmental Water by Solid Phase Microextraction

Abstract:

The solid phase microextraction (SPME) uses a fine fused silica fiber coated with a thin layer to extract directly analytes from samples. The silanol group at silica surface, Si-OH, can be acidic, and may exsit as an Si-O^- group at certain pH level, and silica backbone may have cation exchange secondary interactions, attracting cationic or basic analytes of interest. It is necessary that pH optimum for water sample should be adjusted. A 7 μm nonpolar polydimethylsiloxane coating was used to extract polycyclic aromatic hydrocarbons (PAHs) in environmental water such as river water, rainwater, ground water, tap water and accumulated water on farm. The influence of pH on extraction of PAHs in water was investigated, and the optimum pH 6 was affirmed. A GC/MS was used to detect PAHs with the selective ion-monitoring mode. The optimum thermally desorption time of PAHs from the fiber coating was 5 minutes. The precision and the recoveries were ranged from 4 to 13 % RSD and 71 to 114%, respectively, depending on PAHs species. The trace levels of PAHs in environmental water were detected between 0.4~15.4 ng/ml.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 479-482
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.479
• Online since: August 2013
• Authors: Xiao Xing Liu*, Ye Qing Sun, Jing Ru Zhao
• Keywords: Environmental Water, GCMS, pH, Polycyclic Aromatic Hydrocarbons (PAHs), SPME

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