Determination of Six Arsenic Speciations in Antarctic Krill and Its Products Using High Performance Liquid Chromatography-(Ultraviolet) Hydride Generation-Atomic Fluorescence Spectrometry

KeyWord:arsenic speciation  Antarctic krill  high performance liquid chromatography-(ultraviolet) hydride generation-atomic fluorescence spectrometry

Abstract:

      A high performance liquid chromatography-(ultraviolet) hydride generation-atomic fluorescence spectrometric(HPLC-(UV)HG-AFS) method was developed for the determination of six arsenic speciations in Antarctic krill(Euphausia superba) and its products.Various instrumental conditions such as concentration and pH value of mobile phase,negative high pressure,pump speed and pretreatment conditions were optimized.Under the optimal conditions,there were good linear relationships for arsenious acid(As(¢ó)),arsenic acid(As(V)),monomethylarsenic acid(MMA),dimethylarsenic acid(DMA),arsenic betaine(AsB) and arsenic choline(AsC) in the range of 5-100 ¦Ìg/L with correlation coefficients(r2) larger than 0.999 0.The limits of detection(LOD£¬S/N¡Ý3) and quantitation(LOQ£¬S/N¡Ý10) were 0.01 mg/kg and 0.03 mg/kg£¬respectively.Average recoveries at three spiked levels of 0.01,0.05 and 0.10 mg/kg were in the range of 89.2%-108% with relative standard deviations(RSD,n=6) of 3.4%-14%£®The proposed method was successfully applied in the determination of six arsenic speciations in Antarctic krill and its products.The contents of inorganic arsenic speciations(As(¢ó) and As(¢õ)) were lower than those of the national limit standard for aquatic products and their products.The developed method is simple,wide ranging,accurate and reliable,and could be applied in the speciation analysis of arsenic in Antarctic krill and its products.