摘要
用改进的XANES(X射线吸收近边结构谱 )方法对不同比例Cr(Ⅲ )和Cr(Ⅵ )的酵母制剂进行Cr价态研究 ,该方法与传统方法的区别是用一个电离室同时进行透射和荧光XANES实验 .此实验方法简单 ,快捷 ,特别适用于在相同的实验条件下 ,以一个已知标样为标准 ,对一系列未知价态样品进行的比较分析 .实验结果表明酵母对Cr有很强的还原能力 ,它几乎能将所有的Cr(Ⅵ )还原成Cr(Ⅲ ) .Cr的K 边XANES谱在掺入酵母剂前后有所变化 。
Chromium valence states in yeast biomass are investigated by X-ray absorption near-edge structure spectroscopy (XANES) using an upgraded experimental method. The main advantage of this new XANES method is to record the transmission and fluorescence experimental data simultaneously in a same ion chamber. Such method is very convenient to analyze a series of unknown chromium valence state samples (e.g.relatively low Cr concentration with fluorescence mode) comparing with a standard sample (Cr 2O 3) using transmission mode, in order to avoid systematic error associated to the uncertainty of the edge energy induced by the different experimental operating condition. The experimental results show that in yeast biomass almost all Cr(Ⅵ) is reduced to Cr(Ⅲ) addressing the potential use of biomass for chromium reduction.
出处
《高能物理与核物理》
CSCD
北大核心
2004年第1期100-102,共3页
High Energy Physics and Nuclear Physics
基金
中国科学院百人计划
国家杰出青年基金 ( 10 12 5 5 2 3 )资助~~
