Determination of Inorganic Arsenic Valence in Aquatic Organisms Using Atomic Fluorescence Spectrometry

Compared to the organic arsenic,the toxicity of inorganic arsenic is far greater in food which shows difference according to the arsenic valence state,such as As3+and As5+.So the valence state analysis of inorganic arsenic in food plays an important role in monitoring the food safety.Four aquatic organisms on markets were selected to determine the As3+and As5+ content using atomic fluorescence spectrometry.The detection limit of the method is 0.006mg/kg,the value of RSD was between 1.81% and 2.66%,and the value of recovery rate is between 95% and 105%.The total inorganic arsenic content is between 0.065mg/kg and 0.081mg/kg.The level of As3+ content(0.039mg/kg~0.048mg/kg) was slightly higer than As5+ content(0.026mg/kg~0.033mg/kg).The results showed good precision and accuracy for measurement and analysis of different arsenic valence state in foods.