Abstract
In this study, a special method was developed for the determination of 7 kinds of polychlorinated biphenyls (PCBs) residues in dried kelp by gas chromatography (GC) with electron capture detector (ECD). The PCBs were extracted with hexane/dichloromethane (1/1, v/v) by ultrasonic extraction. Clean-up methods were used by concentrated sulphuric acid, neutral alumina oxide solid phase extraction cartridge and silica solid phase extraction cartridge. The analytical compounds were quantified by an internal standard method. Under optimal experimental conditions, good linearity was observed in the range of 5~200ng/mL, and the correlation coefficients were 0.9993~0.9998. The limit of quantification (LOQ) for target analytical compounds ranged from 6.0 to 7.5μg/kg. At the spiked levels of 10，20，50 μg/kg，the average recoveries ranged from 81.8% to 105% with the relative standard deviations 3.05%～11.2%. The result showed that the proposed method was accurate and could be used for the determination of the PCBs in dried kelp.
Highlights
The Polychlorinated biphenyls (PCBs) are a class of synthetic organic compounds containing carbon, hydrogen and chlorine atoms
The concentration is more than the 30 ng/L standard promulgated by the U.S EPA [1]. They can penetrate the human body through skin contact, by inhalation of PCBs contaminated vapour and by consuming food contaminated with PCB residues [2]
The National Toxicology Program (NTP) and International Agency for Research on Cancer (IARC) have concluded that PCBs are carcinogenic to human
Summary
The Polychlorinated biphenyls (PCBs) are a class of synthetic organic compounds containing carbon, hydrogen and chlorine atoms. They have been used in various industrial and commercial applications owing to their high boiling points, non-flammability, chemical stability and insulating properties. Polychlorinated biphenyls (PCBs), one of the earliest persistent organic pollutants (POPs), are still a global concern due to their ubiquitous and adverse effects on human health, such as endocrine disruption and carcinogenicity, even though their use has been prohibited since 1979[3]. Zhao et al [7] established a method of ultrasonic extraction of polychlorinated biphenyls from kelp, but this method used a large amount of organic reagents and the detection line was high. The established method is effective and accurate for the determination of PCBs in kelp
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