A Flux‐Free Fusion Technique for Rapid Determination of Major and Trace Elements in Silicate Rocks by LA‐ICP‐MS
A Flux‐Free Fusion Technique for Rapid Determination of Major and Trace Elements in Silicate Rocks by LA‐ICP‐MS
复制标题
DOI：
10.1111/j.1751-908x.2015.00352.x
复制
发表时间：
2016-03
影响因子：
3.8
通讯作者：
Zhiwei He;F. Huang;Huimin Yu;Yilin Xiao;Fangyue Wang;Qiu-li Li;Ying Xia;Xingchao Zhang
中科院分区：
文献类型：
--
作者：
Zhiwei He;F. Huang;Huimin Yu;Yilin Xiao;Fangyue Wang;Qiu-li Li;Ying Xia;Xingchao Zhang
开发了一种简单的无熔剂熔融技术来分析硅酸盐岩石的主元素和微量元素组成。将样品粉末在密封在石墨管中的钼胶囊中熔化，以在温度受控的单气氛炉中制备均匀的玻璃。然后使用总金属氧化物标准化的校准策略，通过LA-ICP-MS测量玻璃的主要和痕量元素浓度。最佳条件（即，通过使用一系列USGS参比材料进行熔融实验，获得了制备均匀玻璃所需的温度和持续时间（包括BCR-2、BIR-1、BHVO-2、AGV-1、AGV-2、RGM-1、W-2和GSP-2），其中SiO2含量为47 - 73%m/m。用该方法对美国地质调查局标准物质的分析结果与推荐值基本一致，大多数元素的偏差在5-10%之间。本方法的常规精密度一般优于5- 10%RSD。与之前的LA‐ICP‐MS全岩分析方法相比，我们的无熔剂熔融法在将硅酸盐粉末制成均匀玻璃方面方便有效。此外，它限制了加热过程中挥发性元素的污染和损失。因此，我们的新方法具有很大的潜力，提供可靠和快速的硅酸盐岩石的主量和微量元素组成的测定。
A simple flux‐free fusion technique was developed to analyse major and trace element compositions of silicate rocks. The sample powders were melted in a molybdenum capsule sealed in a graphite tube to make a homogenous glass in a temperature‐controlled one‐atmosphere furnace. The glass was then measured for both major and trace element concentrations by LA‐ICP‐MS using a calibration strategy of total metal‐oxide normalisation. The optimum conditions (i.e., temperature and duration) to make homogeneous glasses were obtained by performing melting experiments using a series of USGS reference materials including BCR‐2, BIR‐1, BHVO‐2, AGV‐1, AGV‐2, RGM‐1, W‐2 and GSP‐2 with SiO2 contents from 47 to 73% m/m. Analytical results of the USGS reference materials using our method were generally consistent with the recommended values within a discrepancy of 5–10% for most elements. The routine precision of our method was generally better than 5–10% RSD. Compared with previous methods of LA‐ICP‐MS whole‐rock analyses, our flux‐free fusion method is convenient and efficient in making silicate powder into homogeneous glass. Furthermore, it limits contamination and loss of volatile elements during heating. Therefore, our new method has great potential to provide reliable and rapid determinations of major and trace element compositions for silicate rocks.