基于石墨掺杂制备样品的尖端放电原子发射光谱法直接测定土壤中重金属  

Direct Determination of Heavy Metals in Soil by Point Discharge Atomic Emission Spectrometry through Graphite-doped Sample Preparation

作　　者：熊彦棋 闫晗 陈家灯 田云飞[1] 侯贤灯[1] XIONG Yan-Qi;YAN Han;CHEN Jia-Deng;TIAN Yun-Fei;HOU Xian-Deng(Analytical&Testing Center,Sichuan University,Chengdu 610064,China)

机构地区：[1]四川大学分析测试中心,成都610064

出　　处：《分析化学》2024年第10期1528-1535,共8页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.21974092)资助。

摘　　要：采用原子发射光谱法测定元素含量时,利用放电等离子体光源通常难以直接分析导电性差的样品。本研究利用石墨作为导电介质,将其与金属盐和二氧化硅混合用于压片制作土壤分析样品,然后采用钨针电极对样品放电,产生的尖端放电微等离子体激发样品中待测元素的原子发射光谱信号,从而实现非导电土壤样品的放电等离子体原子发射光谱分析。通过采用Cu 324.7 nm谱线作为分析线,考察实验条件对其激发的影响,实现对标准样品和实际样品中痕量铜的准确测定。本方法也可用于其它重金属(如锰、铁和锌等)的检测,为非导电样品的放电等离子体原子发射光谱分析提供了制样参考,有望用于土壤样品中重金属的现场快速分析。The analysis of poorly conductive samples using discharge plasma is a significant challenge in determining elemental content by atomic emission spectrometry.In this study,graphite as a conductive medium was combined with metal salts and silica to prepare soil sample pellets.A tungsten needle electrode was employed to generate point discharge microplasma with the sample,exciting atomic emission signals of analyte elements.By using Cu 324.7 nm as the analytical line,both the capability to excite atomic emission spectral lines and the impact of experimental conditions were investigated,resulting in accurate determination of trace copper in both standard and real samples.This method held promise for detecting other metals like manganese,iron,and zinc.This work offered methodology for non-conductive sample analysis via discharge plasma atomic emission spectrometry,showing potential for rapid on-site assessment of soil samples.

关 键 词：原子发射光谱 固体样品分析 重金属 尖端放电微等离子体 小型化仪器 

分 类 号：O657.31[理学—分析化学] X833[理学—化学]