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Copyright of Acta Petrologica et Mineralogica / Yanshi Kuangwuxue Zazhi is the property of Acta Petrologica et Mineralogica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Rock & Mineral Analysis is the property of Editorial Board of Rock & Mineral Analysis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Rock & Mineral Analysis is the property of Editorial Board of Rock & Mineral Analysis and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: Critical problems such as ion diffusion and uncontrollable flow rate exist when applying the traditional natural flow chromatography column method to isotope analysis. The proposed automated chemical purification system improves the efficiency of isotope analysis, and reduces the time required for element purification.OBJECTIVES: To develop an automated chemical separation and purification system.METHODS: The automated chemical separation and purification system was composed of multi-way valves, plunger pump, autosampler, etc. All of the components were connected using a computer and each of them can be controlled independently. By combining two chromatographic columns multiple functions can be achieved, including reversed elution, which cannot be achieved by the traditional natural flow chromatography column method. In order to investigate the performance of the automated chemical separation and purification system, fresh seawater was purified with the proposed system and the traditional method simultaneously.RESULTS: The elution peak of boron had a width of 2.5 mL to 3.0 mL for the traditional method, but only ca. 1.0 mL for the proposed system, if the loading volume of seawater was 1.0 mL. The flow rate of the elution depended on the acidity using the traditional natural flow chromatography column method. However, the flow rate could be strictly controlled with the automated chemical separation and purification system.CONCLUSIONS: The precisely controlled flow rate of the system makes an easier prediction of the elution time and elution peak. The reversed column technology of the system can be applied to the separation and purification of elements for isotope analysis. [ABSTRACT FROM AUTHOR]

In recent decades, Fe, Cu and Zn isotopes have been the hot topic with the development of analytical methods of these isotopes. However, the standard materials for isotope analysis are very sparse. There is only one Fe isotope standard material and one Zn isotope standard in The European Institute for Reference Materials and Measurements (IRMM). The former is sold out and therefor unobtainable, whereas the latter is expensive. There is one Cu isotope standard material in National Institute of Standards and Technology (NIST). In order to adapt to the development of Fe, Cu and Zn isotope analyses in China, three new standard solutions to be used as references for Fe, Cu and Zn isotopic composition have been prepared in the Institute of Geology, Chinese Academy of Geological Sciences, Beijing. Fe, Cu and Zn isotopic standard solutions are named CAGS-Fe, CAGS-Cu and CAGS-Zn, respectively. Fe, Cu and Zn isotopic compositions of these standard solutions were measured by high precision Nu Plasma High-resolution Multi-collector Inductively Coupled Plasma-Mass Spectrometry (MC-ICP-MS). Three standard solutions show high homogeneity and stability by F investigation. The Fe, Cu and Zn isotopic compositions have shown no obvious variations over 38 months, indicating good homogeneity. The reference values for standard solutions and their associated uncertainties at 95% confidence level are 0.80±0.05 (δ56FeIRMM014,‰), 1.20±0.10 (δ57FeIRMM014,‰), 0.57±0.06 (δ65CuNBS976,‰), -0.77±0.10 (δ66ZnIRMM3702,‰) and -1.55±0.13 (δ68ZnIRMM3702,‰). Standard solutions can be used for instrumental calibration and analytical monitoring, which is meaningful for inter-laboratory data comparison. [ABSTRACT FROM AUTHOR]

Fe isotopes fractionate during magmatic processes. Comparing to mantle xenoliths(withδ56 Fe average value of ca. 0‰), basalts incorporate heavier Fe isotopes(withδ56 Fe average value of 0. 1‰). Relative to basic and intermediate magmatite, acidic magmatites show heavy Fe isotope enrichments. The Fe isotope fractionation during magmatic processes is controlled mainly by the oxidation states. Normally, Fe3+-bearing minerals(e. g. , magmatite)incorporate heavy Fe isotopes than Fe2+-bearing minerals(e. g. , olivine, pyroxene). During partial melting process, Fe3+is enriched in the melt preferentially, leading to heavy Fe isotopes enriched into the melt. As a result, the partial melting product(normally basalt)incorporates heavy Fe isotopes relate to the residue. During magmatic differentiation, the crystallization of Fe2+-bearing minerals such as olivine and pyroxene in low oxygen fugacity condition leads to enrichment of Fe3+thus heavy Fe isotopes in the residual melt;the crystallization of Fe3+-bearing minerals such as magnetite in high oxygen fugacity results in enrichment of Fe2+thus light Fe isotopes in residual melt. During fluid exsolution, the exsolved fluid preferentially incorporates light Fe isotopes. It shows that Fe isotope is a powerful tracer for studying magmatic processes. [ABSTRACT FROM AUTHOR]