摘要
采用国家颁布的海藻制品卫生标准和食品中无机砷检测标准方法对海藻中的无机砷进行检测，结果发现无机砷的超标问题突出。为了探讨海藻中无机砷超标的真实原因，对GB／T5009．11—2003中规定的用氢化物原子荧光光度法和银盐法测定海藻中无机砷含量的适用性进行了探讨。通过对两种检测方法所采用的消化处理过程进行比较，结果显示：同一种紫菜经过60℃水浴中消化18h处理后测定的无机砷含量明显高于在70℃水浴中消化1h处理后的无机砷含量，对于干紫菜，前者为后者的1．58～5．17倍；而对于湿紫菜，前者为后者的4．55～5．17倍。同时，试验中用小分子有机砷进行加标试验，结果表明：二甲基胂酸、甲基胂酸二钠等小分子有机砷对两种测定方法的影响很大，会把小分子有机砷作为无机砷检测出来，且检出回收率很高。因此，作者认为，由于海藻食品中小分子有机砷含量较高，GB／T5009．11—2003规定的两种检测方法均不适用于海藻类中无机砷的检测。
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.
出处
《大连水产学院学报》
CSCD
北大核心
2009年第2期146-150,共5页
Journal of Dalian Fisheries University
基金
福建省海洋与渔业局科技项目(闽海渔科06385)
关键词
海藻
无机砷
小分子有机砷
测定方法
seaweed
inorganic arsenic
small molecular organic arsenic
detection method
