密封消解ICP-AES和ICP-MS测定中日两国茶叶中23种矿质元素

收集了13种中国茶叶和6种日本茶叶，在进行密封消解后，采用电感耦合等离子体发射光谱法(ICP-AES)和电感耦合等离子体质谱法(ICP-MS)测定了茶叶中Al，Ba，Ca，Cd，Ce，Co，Cr，Cs，Cu，Fe，La，Mg，Mn，Na，Ni，Pb，Rb，Sb，Sr，Th，U，Y和Zn等23种矿质元素的含量，并用茶叶标准参考物质(GBW07605)评价了分析方法的准确度。研究结果表明：密封消解有助于获得较为准确的茶叶中矿质元素含量的分析结果;与日本茶叶相比，中国茶叶中Cd，Co，Cr，Cs，Fe，Pb，Rb，Sb，Th，U和Zn等元素含量显著偏高(P＜0.05)，预示大气重金属污染程度中国较日本严重。另外，还发现茶叶中一些矿质元素含量之间有很强的线性相关性。

Analysis of 23 Mineral Elements in Tea Samples Collected from China and Japan by Using ICP-AES and ICP-MS Combined with a Closed Decomposition

After a closed decomposition,the concentrations of Al,Ba,Ca,Cd,Ce,Co,Cr, Cs,Cu,Fe,La,Mg,Mn,Na,Ni,Pb,Rb,Sb,Sr,Th,U,Y and Zn in thirteen Chinese tea samples and six Japanese tea samples were analysed by using ICP-AES and ICP-MS,a tea standard reference material(GBW07605) was used to verify the accuracy and the precision of analytical method.It was demonstrated that a closed decomposition can help to get good results for the concentrations of mineral elements in tea samples.(Compared) with those in Japanese tea samples,the concentrations of Cd,Co,Cr,Cs,Fe,Pb,Rb,Sb,Th,U and Zn in Chinese tea samples are significantly high,which means the atmosphere in China is contaminated by heavy metal particles more severely than that in Japan.Moreover,it was found that the concentrations of many mineral elements in tea samples correlate each other.