A method was developed for determination of 7 indictors the polychlorinated biphenyls (PCBs) residues in porphyra by gas chromatography (GC) with electron capture detector (ECD). The PCBs were extracted with hexane/methylene chloride (1:1, v/v) by ultrasonic extraction and the samples were cleaned up by concentrated sulfuric acid and Alumina-N solid phase extraction cartridge. The analytes were quantified by an internal standard method. Under optimal experimental conditions, good linearity was observed in the range of 5 -200 ng/mL and the correlation coefficients were 0.9994 -0.9998. The limit of quantitation (LOQ) for target analytes ranged from 6.0 to 10.0 μg/kg. At the spiked levels of 10, 50, 100 μg/kg, the average recoveries ranged from 90.9% to 102% with the relative standard deviations 2.12% -6.32%. The result showed that the proposed method was rapid, and could be used for the determination of the PCBs in porphyra.
The concentration of aluminum in salted jellyfish (Rhopilema esculentum) was determined and samples were collected from market located in Shanghai. Risk of aluminum in salted jellyfish was analyzed in the present study. 16 samples were collected from markets in Shanghai, including instant jellyfish and raw salted jellyfish. The results show that the aluminum concentrations of samples ranged from 126.9mg/kg to 489.2mg/kg. In the present study, the concentration of aluminum from different tissues of jellyfish was detected, and the results indicated that there was no significant difference between different tissues. And the risk was analyzed by intake of jellyfish according to the WHO regulations. The analysis results showed that when aluminum concentration exceeded 1000mg/kg, The PTWI value would exceeded the limit of 2mg/kgbw stipulated in WHO regulations. The aluminum intake from salted jellyfish would not influence consumers' health under normal living mode.
Abstract. In the present study, canned crab and canned tuna were taken as the quality control samples, and microwave digestion combined with wet-digestion was estimated as the optimum digestion method for animal origin seafood after comparing with the microwave digestion. The quality control samples were digested under microwave first, and then 1 mL HClO 4 and 2 mL H 2 SO 4 were added to the digestion solution for wet digestion. Atomic Fluorescence Spectrometry (AFS) was adopted to determine the concentration of total arsenic in quality control samples. The result obtained is close to the assigned value with high accuracy. The relative error ranges from 1.8% to 2.1%. The present study elaborates the experimental phenomena and conversion mechanism of different existing forms of arsenic in details during wet-digestion under HNO 3 -HClO 4 -H 2 SO 4 system. And it is effective and convenient to control the time node by analyzing the experimental phenomena which is conductive to ensure the accurate results.
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