Extraction and determination of biphenyl and biphenyl oxide in water samples by using homogeneous liquid-liquid microextraction via flotation assistance-high performance liquidchromatography

A new method was developed for simultaneous determination of biphenyl and biphenyl oxide in water samples with homogeneous liquid-liquid microextraction via flotation assistance and high performance liquid chromatography. In this research, a special extraction cell was designed to facilitate collection of the low-density solvent extraction. Nocentrifugation was required in this procedure. The sample solution was added into the extraction cell, which contained appropriate mixture of n-heptane (as extraction solvent) and acetone (as homogeneous solvent). Using air flotation, extraction solvent was collected from the top of the solution. Under the optimum conditions, good linearity was observed in a range of 0.5-100 and 10.0-100 μg L-1 for biphenyl oxide and biphenyl, respectively. The limits of detection (LODs) were 0.07 and 5.0 μg L-1 for biphenyl oxide and biphenyl, respectively (S/ =3). The developed method was successfully applied to determine the analytes in different water samples.

Keywords:

Homogeneous liquid-liquid microextraction , Flotation assistance , Biphenyl , Biphenyloxide , water samples