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目的液相色谱-原子荧光联用测定海带和紫菜中的砷形态前处理方法比较。方法分别用稀酸水溶液提取法和湿法消解法处理样品后,用液相色谱-原子荧光联用仪测定样品中的砷形态。结果稀酸水溶液提取法测定砷的回收率为89.65%~97.53%,As(Ⅲ)、DMA、MMA、As(V)精密度(RSD)分别为0.59%、0.27%、1.20%和0.63%;湿法消解法测定DMA的率为79.0%~85.7%,DMA、MMA、As(V)精密度(RSD)分别为0.15%、0.95%和9.11%。结论用稀酸水溶液提取法处理样品更适合于海产品砷形态的分析。
Aim To compare the pretreatment methods of arsenic speciation in seaweed and seaweed by liquid chromatography - atomic fluorescence spectrometry. Methods The samples were treated with dilute aqueous acid and wet digestion, respectively. The arsenic speciation was determined by liquid chromatography - atomic fluorescence spectrometry. Results The recovery of arsenic was 89.65% ~ 97.53%, and the RSD of As (Ⅲ), DMA, MMA and As (V) were 0.59%, 0.27%, 1.20% and 0.63%, respectively. The DMA of wet digestion was 79.0% ~ 85.7%, and the precision of DMA, MMA and As (V) were 0.15%, 0.95% and 9.11%, respectively. Conclusion It is more suitable to analyze the arsenic speciation of seafood with the method of extracting with dilute aqueous solution.