ICP-MS法测定红桃K中13种元素

Determination of 13 Kinds of Elements in Roselle by ICP-MS

试验采用密闭高压消解法消解红桃K样品,利用电感耦合等离子体质谱法准确测定其中13种元素(Pb、Cd、As、Cr、Mn、Cu、Zn、K、Na、Ca、Mg、Fe、Se)的含量。结果表明,13种元素线性方程的相关系数均大于0.999,检出限在0.001~0.800 mg/kg之间;方法用于标准物质绿茶(GBW 10052)的测定,各元素的测定值均在标准值范围内,说明方法准确、快速并且检出限低,适用于红桃K样品中重金属元素的快速批量测定;红桃K中富含对人体有益的钾、锌、铁以及硒等营养元素,但是极个别重金属元素(铅、镉等)较普通食品含量略高,应该予以关注。

Roselle were digested by sealed high pressure digestion,and the content of 13 kinds of elements(Pb、Cd、As、Cr、Mn、Cu、Zn、K、Na、Ca、Mg、Fe、Se)were accurately determined by inductively coupled plasma mass spectrometry. The results showed that the correlation coefficients of the linear equations of 13 elements were all greater than 0.999,and the detection limit of the method was 0.001-0.800 mg/kg.The proposed method was applied to the determination of reference samples(GBW 10052),the determination value of each element was within the range of the marked value,indicating that the proposed method was accurate,rapid and low detection limit,which was suitable for the rapid determination of heavy metal elements in roselle.Roselle is rich in beneficial nutrients such as potassium,zinc,iron and selenium,but the content of heavy metal elements(lead and cadmium) is slightly higher than ordinary food,which should be paid attention to.