手持式X射线荧光光谱仪测定富钴结壳样品中锰铁钴镍铜锌

便携式X射线荧光光谱仪可以快速进行多元素实时分析,在富钴结壳资源勘查中有广阔的应用前景,但是现有仪器的分辨率和稳定性有待进一步提高,特别是现场原位分析法的应用有待研究。本文针对富钴结壳中目标元素含量相对较高的特点,采用松散粉末法制样,建立了手持式X射线荧光光谱仪快速测定太平洋富钴结壳样品中Mn、Fe、Co、Ni、Cu和Zn的分析方法。该方法用多金属结核和富钴结壳国家标准物质进行验证,测定值的相对标准偏差(RSD)在0.2%~3.0%之间,测定值与标准值的相对误差为92.9%~107.6%。样品现场分析和实验室分析的数据对比表明,除了低含量Cu略有超差外,Mn、Fe、Co、Ni、Zn和品位均无超差,完全满足该类矿产资源勘查规程的要求。本法简单、高效,适用于对野外富钴结壳资源作出快速的初步评价。

Determination of Mn, Fe, Co, Ni, Cu and Zn in Cobalt-rich Crusts by Portable X-ray Fluorescence Spectrometer

A portable X-ray Fluorescence Spectrometer can be used for quantitative field analysis with the advantages of rapidity and multi-elemental analysis, while possessing broad application prospects for exploration of cobalt-rich crust resources. However, there also some capacity for improving the resolution and stability of the instrument, and the applications of in-situ analysis need to be developed. Based on the features of a relatively high content of target elements, a method has been introduced for the determination in field of Mn, Fe, Co, Ni, Cu and Zn in cobalt-rich crusts collected from the Pacific Ocean by portable X-ray Fluorescence Spectrometer (AFS) coupled with a directly pressed powder sample preparation technique. The reliability of the method is discussed. The proposed method has been validated by analyzing certified reference materials, the relative standard deviations being 0.2%-3.0% and accuracies of 92.9%-107.6%. The described method was also assessed by field detection and laboratory testing, and good consistencies were obtained for the elements of interest except for low content of Cu, which would meet the need of testing quality management for exploration of cobalt-rich crusts resources. The data of in-situ analysis was evaluated by comparing with that obtained from AFS after sample preparation, which show that the results from in-situ analysis are lower for Mn, Fe, Co and Ni with accuracies of 68%-100%. The method has been proved to be simple and effective, which is appropriate for fast analysis in preliminary evaluation of cobalt-rich crusts resources.