Abstract: The over - standard inorganic arsenic was found in seaweeds according to the sanitation standard of seaweed which were detected by the standard method of inorganic arsenic detecting in food. The utilization of two detection methods, auto fluorescence spectrometry （AFS） and silver diethyl -dithiocaobamate method set in the standard of GB/T 5009.11 - 2003, was conducted to find the cause of over - standard inorganic arsenic in seaweeds. It was found that the digestion methods used in the two standard detection methods led to completely different results. The detected amount of inorganic arsenic was higher during the digestion of the same layer at 60 ℃ for 18 h than 70 ℃ for 1 h, with variation of 1.58 -5.17 times for laver （Porphyra）. Meanwhile, the standard experiment on addition of small molecular organic arsenics revealed that the small molecular organic arsenics such as cacodylic acid, disodium methylarsonate （DSMA）were detected to be inorganic arsenic by the two detection methods with high recovery efficiency. Therefore, it was considered that the two detection methods stated in the standard of GB/T 5009.11 -2003 were not applied to detect inorganic arsenics in seaweeds due to aboundant small molecular organic arsenics in seaweed food.
2009, Vol. 24 
