Abstract:

Parameters affecting the ultrasonic extraction of polychlorinated biphenyls (PCBs) from sea products, including temperature, time, power and liquid (n-hexane) to solid ratio, and effluent collection in column chromatography were investigated. Based on experimental results, the following conditions were chosen: extracting sample at 40 ℃ at 540 W for 120 min with the liquid to solid ratio of 6:1; beginning to collect the effluent up to 10 ml when there was 10 ml of effluent flowing out of silica gel column. The PCBs in the extract were quantified using gas chromatography. The recovery rates of PCBs in this method range between 72.66% and 91.56%, and the average is 87.93%. This method was also used to analyze sea products such as hairtail, butterfish and shrimp. The results proved that the established method is reliable.

Key words: ultrasonic extraction, gas chromatography, polychlorinated biphenyl (PCB), sea product