普通X射线荧光光谱法用于中太平洋富钴结壳中锰价态的定量分析  

Quantitative Analysis of Valences for Manganese in Cobalt-rich Crust Samples from the Central Pacific Ocean by X-ray Fluorescence Spectrometry

作　　者：韩杰[1] 叶瑛[2] 张孟群[3] 刘笛[3] 张维睿[2] 邬黛黛[1] 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]浙江大学地球科学系,浙江杭州310027 [3]南京大学现代分析中心,江苏南京210093

出　　处：《岩矿测试》2007年第2期97-100,104,共5页Rock and Mineral Analysis

基　　金：国家十五大洋专项基金(DY105-01-04-3)

摘　　要：应用普通X射线荧光光谱仪,结合PeakFit谱峰处理软件,对不同比例的MnO和MnO_2的人工混合样品的谱峰参数进行了研究,用数学方法将实测的谱峰分解为各个单一的谱峰参数(峰位、峰高、半高宽、子峰积分面积),找出了各个谱峰参数与不同价态锰含量之间的关系,并据此确定了中太平洋海山区大量富钴结壳样品中Mn^(4+)的相对含量,主要集中在80%～100%。总结了富钴结壳中中层和表层Mn^(4+)的含量高、核心层Mn^(4+)的含量低的变化规律,认为这与该区第四纪以来南极底流活动的增强有关。The Kβ spectral peak parameters of the mixed samples with different ratios of MnO and MnO2 were studied using a conventional X-ray fluorescence spectrometer and PeakFit spectral processing software. The measured spectra were decomposed into various single spectral peak parameters such as peak position, peak intensity and FWHM etc. by deconvolution of overlapped spectral peaks. The relationship between the peak parameters and the contents of different Mn valences was studied. According to the results, the relative contents of the Mn^4＋ in a large number of cobalt-rich crust samples from the central Pacific seamount area were quantified with the range of 80% - 100%. h summarized a law that the content of Mn^4＋ is high in cobalt-rich crusts＇ outer layer and middle layer, but low in cobalt-rich crusts＇ inner layer. It is thus proposed that the changes of Mn^4＋ content in cobalt-rich crusts could be the result of Antarctic bottom water activity since the Quaternary period.

关 键 词：X射线荧光光谱法 锰化学价态 富钴结壳 南极底流 

分 类 号：O657.34[理学—分析化学] O614.711[理学—化学]