微波消解ICP-OES测定牛蒡茶中的矿质元素

采用HNO3/H2O2微波消解的制样方法,利用全谱直读电感耦合等离子原子发射光谱仪（ICP-OES）对牛蒡茶中的Al、As、Ba、Ca、Cd、Cr、Cu、Fe、K、Mg、Mn、Na、Ni、P、Pb、Sr、Ti、Zn等18种矿质元素进行了测定。结果表明,牛蒡茶中含有人体必需常量元素K、Na、Ca、Mg、P和人体必需微量元素Cu、Fe、Mn、Ni、Ti、Zn,以及人体非必需的微量元素Al、Ba、Sr,而有害元素As、Pb、Cr、Cd均未检出。并建立了一种牛蒡茶中矿质元素的分析测试方法,各元素的回收率均在93.7%¹07%,相对标准偏差在1.31%².31%,检出限低且满足各元素分析要求,此方法具有简捷、快速、准确的特点。 

Determination of mineral elements of burdock tea by microwave digestion ICP-OES

By microwave digestion procedure with HNO3/H2O2 to prepare samples,18 mineral elements including Al,Ba,Ca,Cu,Fe,K,Mg,Mn,Na,Ni,P,Sr,Ti and Zn in burdock tea were completely analyzed by inductively coupled plasma optical emission spectrometer(ICP-OES). It was found that burdock tea contained some beneficial macroelements such as K,Na,Ca,Mg,P. Some beneficial trace elements such as Cu,Fe,Mn,Ni,Ti,Zn were also found. As well as there were non-essential trace elements,such as Al,Ba,Sr in burdock tea.Whereas some harmful elements such as As, Pb, Cr, Cd were not determined. An analysis method was established for determination of mineral elements in burdock tea. Recoveries of all elements in this experiment were in the range of 93.7%~107%. And relative standard deviations were in the range of 1.31%~2.31%. The detection limit of this method was low and fit the analysis requirements of all elements. This method was concise,quick and accurate.