微波消解–ICP–AES法测定罗布麻叶中16种微量元素

Determination of 16 Trace Elements in the Leaves of Apocynum Venetum by Microwave Digestion–ICP–AES method

建立微波消解–ICP–AES法测定罗布麻叶中Na,Ca,Mg,Fe,Al,P,Mn,Ni,Cu,Zn,Ti,Se,Ba,Pb,Sr,Cd 16种微量元素含量的方法。以HNO_3–H_2O_2–HF溶液(6∶4∶1)为消解体系,样品经微波消解后,用ICP–AES法对罗布麻叶中16种元素含量进行测定。各元素的质量浓度在0.01~1.00 mg/L范围内与光谱强度呈良好的线性关系,线性相关系数r>0.999,检出限在0.000 5~0.008 0 mg/kg之间。加标回收率为87.56%~101.47%,测定结果的相对标准偏差为1.2%~3.42%(n=6)。该方法操作简单,准确度好,灵敏度高,可用于罗布麻叶中微量元素分析。

A method for the determination of16elements content in the leaves of Apocynum Venetum by microwave digestion and ICP-AES was developed,including Na,Mg,Ca,Fe,Al,P,Mn,Ni,Cu,Zn,Ti,Se,Ba,Pb,Sr,Cd.The samples were pretreated by using vacuum microwave digestion in HNO3-H2O2-HF(6∶4∶1)solution system,then16elements content in the leaves of Apocynum Venetum were analyzed.The mass concentration of every elements had good linear relationship with the spectral intensity in the range of0.01-1.00mg/L,and the correlation coefficients were more than0.999,the detection limit ranged from0.0005mg/kg to0.0080mg/kg.The recoveries of standard addtion were87.56%-101.47%,and the relative standard deviations of determination results ranged from1.20%to3.42%(n=6).The method has the advantages of simple operation,high accuracy and sensitivity,and it can be used for the analysis of trace elements in the leaves of Apocynum Venetum.