摘要
石墨炉电热原子化器作为原子发射源对痕量元素的测定有很大的实用意义。火焰原子发射光谱法测定碱金属有较高的灵敏度,这早已被人们所肯定,石墨炉原子发射光谱法(GFAES)与其相比,灵敏度可提高几个数量级,但石墨炉的发热体——石墨管在高温下受光辐射的影响会产生较强的背景。Ottaway等作了一系列的研究及国内在测定K、Na、Li和Ba的工作都取得很好的结果。本文研究痕量Rb和Cs的实验条件,优化各种参数,获得最佳的信背比,得到良好的线性关系及最低检出极限。
Shanghai Institute of Metallurgy, Academia Sinica Shanghai, graphite furnace atomiser has been evaluated as a source of atomic emissions of practical value in trace elements. The thermal population of excited states suggests that the greatest emission sensitivity would be observed for elements such as alkali and alkaline earth. In this paper, the determination of trace levels of Rb and Cs in biological samples by graphite furnace atomic emission spectrometry is developed. The optimum parameters of atomization temperature, time and slitwidth were selected and satisfactory results of detection limit, signal to background (S/B) ratios and linearity of calibration curve were obtained. The effect of coexisting elements to determination of Rb was studied. The detection limits and relative standard deviations of the determination are. Rb 0.5pg,2.6% and Cs 25pg, 5%, respectively.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1990年第4期26-29,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金
