微波消解-电感耦合等离子质谱(ICP-MS)法测定食品中汞的研究

Studies on Detemination of Mercury in Foods by Inductively Coupled Plasma- Mass Spectram Etry with Microwave Digestion

建立微波消解-电感耦合等离子质谱（ICP—MS）法，检测食品中的汞。不同食品中的汞经微波消解、电感耦合等离子体质谱测定，采用购于国家标准物质中心的标准品进行加标回收试验，验证该方法的准确度和精密度。结果表明，该方法的回收率为77．6％-91．8％，相对标准偏差小于5％，灵敏度、准确度和精密度均符合相关的技术要求，方法检出限为0．00368μg，L。试验表明，该方法快速、准确、灵敏度高，可用于食品中痕量汞的测定。

A method is established for detemination of mercury in foods by inductively coupled plasma-mass spectram etry with microwave digestion. Mercury in different food are digested with microwave digestion system and measured with inductively coupled plasma mass spectrametry method. By purchasing in the center of the national standards of material standard standard addition recovery test verifies the accuracy and precision of method. Results show that the recoveries ranged from 77.6% ~ 91.8% and relative stand deviation （RSD） is less than 5%. The sensitivity accuracy and precision of the method comply with the technical standards of the determination. The limits of quantitation is 0.003 68 I.Lg/L. The developed method is rapid, sensitive and accurate. The method can be applied to the trace determination of mercury in foods.