Objective To establish a method of ashing digestion-atomic fluorescent spectrometry (AFS) for determination of total arsenic in aquatic animal products after being soaked in magnesium nitrate/ethanol solution.
Methods Samples were ashing digested after being soaked in magnesium nitrate/ethanol solution for a whole night. Then, the digestion solution was pre-reduced and determined by AFS. The result was verified using sea fish powder standard sample.
Results In terms of the proposed method, the standard curve range was 0.00-10.00μg/L; the correlation coefficient was ≥ 0.9990; the detection limit was 0.05 μg/L. The recoveries of the method were 95.4%-100.4%, with relative standard deviation ≤ 4.83%. All six verified values of sea fish powder standard sample were within the permitted range of (780±80) μg/kg, with a mean value of 818 μg/kg and a relative standard deviation of 3.42%.
Conclusion The method of ashing digestion-atomic fluorescent spectrometry after being soaked in magnesium nitrate/ethanol solution is safe, stable, and accurate for the determination of total arsenic in animal seafood.
DownLoad: