微波等离子体炬原子发射光谱法测定米粉中微量元素——一个大学化学仪器分析实验的设计与实践

设计了一个科研参与型的大学化学仪器分析实验。本实验应用MPT原子发射光谱仪对米粉中的金属元素(Ca,Cu,Fe,Mn)进行了检测分析。对影响金属元素检测性能的实验条件,如微波等离子体炬的微波功率和维持气流量进行了系统的考查及优化。最后,通过对样品进行测定,证实与标准含量相符,结果比较满意。学生在实验过程中,可以学习和掌握样品的前处理方法、原子发射光谱的机理和仪器测试条件的优化。

Determination of Trace Elements in Rice Flour Using Microwave Plasma Torch-Atomic Emission Spectrometry:Design and Practice of a College Chemistry Experiment of lnstrumental Analysis

A research type experiment of instrumental analysis was designed for undergraduates. In this experiment, microwave plasma torch-atomic emission spectrometer (MPT-AES) was used to detect trace metal elements (Ca, Cu, Fe and Mn) in flour samples. The experimental conditions, such as microwave power and supporting gas flow rate were optimized. Finally, the standard rice flour sample was detected under the optimum experimental conditions with a satisfying result. During this experiment students can learn and master the sample pretreatment method, the mechanism of atomic emission spectrum and optimization of the equipment testing.