微波消解-冷原子吸收法测定螺旋藻粉中的痕量汞

Determination of trace mercury in spirulina powder by microwave digestion and cold atomic-absorption spectroscopy

目的:建立用微波消解-冷原子吸收法测定螺旋藻粉中的痕量汞的方法。方法:螺旋藻粉样品经过微波消解后,其中的汞被氧化为离子状态的汞,利用冷原子吸收测汞仪对样品进行测定。结果:汞浓度在0～5.00μg/L的范围内具有较好的线性,相关系数达到0.9999,方法检出限为0.013μg/L,且对国家一级标准物质贻贝(GBW08571)的验证结果与标准值吻合,回收率为90%-108%,样品测定相对标准偏差为4.7%。结论:微波消解-冷原子吸收法灵敏度高,操作简单快捷,结果可靠,适合于测定螺旋藻粉中的痕量汞。

Objective：To establish a method for the determination of trace mercury in spirulina powder by microwave digestion and cold atomic-absorption spectroscopy. Methods：After microwave digestion, mercury in Spimlina Powder was oxidated to the state of the ion of mercury, then the sample was detected by mercury analyzer. Results：A good linear relationship was obtained from the concentration of mercury range 0-5.00 μg/L,r = 0.9999,the detection limit was found to be 0.013 μg/L,and the experimentally determined average value for mercury in China standard reference material of Mussels （GBW08571） was found to be in good agreement with the certified value, recovery of methazolamide was between 90%-108% with the relative standard deviation（RSD） of 4.7% o Conclusion： The method of microwave digestion and cold atomic-absorption spectroscopyc was simple, sensitive, and suitable for determination of trace mercury in spirulina powder.