HG-AFS Determination of Inorganic Arsenic in Food After Separation with Cation Exchange Resin

Micro-amounts of inorganic arsenic in food was separated from MMA and DMA by cation exchange resin,and determined by HG-AFS.Preparation of the cation exchange column and analytical conditions,including pH of eluent,flow rate of eluent,and interferences of the coexisting ions were studied and optimized.Detection limit (3s/k) found was 0.76 μg·L-1,and RSD (n=12) was 1.8%.The proposed method was used in the determination of inorganic arsenic in cucumber sample,giving the values of recovery in the range of 96.3%-98.2%.