摘要
采用X-射线荧光（XRF）、电感耦合等离子体光谱和质谱（ICP-AES/MS）技术,研究了超细地质分析样品（约800目）的分析方法和条件。结果表明,对于超细样品,XRF可直接粉末压片制样而不必高温熔融制样进行高精度的主、次组分测定;ICP-AES/MS的取样量可降至2-5 mg（仅为-200目样品的1/20-1/50）,试剂用量大大减小,样品更易消解,不仅可节约成本,降低能耗,还显著减小了对环境的影响。讨论了发展超细样品分析的意义及对地质分析技术发展的可能影响。
Compared to the traditional-200 mesh geological samples,ultra-fine powders（about 800 mesh） have superior analyzable properties.In this contribution,the geological samples to ultra-fine powders were processed and their particle size distributions by a laser particle-size analyser were determined.The analytical methods were studied by the dominant geoanalytical techniques of X-ray fluorescence（XRF）,inductively coupled plasma atomic emission spectrometry and mass spectrometry（ICP-AES/MS）.It is found that for the high precision determination of major and minor constituents by XRF,it is no longer necessary to melt the specimen into fused bead under high temperature,while it can be achieved directly by pressing powder pellets prepared from ultra-fine crushed test portions;As for ICP-AES/MS analysis,the ultra-fine powders sampling amounts can be reduced to 2-5 mg（only 1/20-1/50 of sampling amounts of-200 mesh samples）,and the digestions of samples can be performed using less amounts of chemicals and shorter processing times at lower temperatures because ultra-fine particle size samples are much more homogenous and have higher specific surface area than-200 mesh samples.It will reduce in cost and save energy during sample preparation.Finally,the importance to develop the ultra-fine sample analysis and its potential impact for the future developments in geo-analytical technologies were discussed.
出处
《分析测试学报》
CAS
CSCD
北大核心
2010年第6期578-583,共6页
Journal of Instrumental Analysis
基金
中国地质调查局国家专项资助项目(200120190107-06)
