In sample preparation and mass spectrometry analysis, sample dissolution, column chemistry, concentration mismatches, and matrix effects have significant potential for introducing analytical artifacts during Mg isotope analysis. Based on the low MgO content and undesirable matrix elements in felsic rocks, the development of well-characterized felsic standards is essential to reduce inter-laboratory mass bias, enable the assessment of data accuracy, and facilitate the comparison of chemical separation procedures in different laboratories. In this work, the homogeneity and long-term stability of two felsic rock standards, GSR-1 and RGM-2, were evaluated due to their low MgO contents. Furthermore, synthetic solutions with doped matrix elements were used to evaluate potential Mg isotope analytical artifacts using multi-collector inductively coupled plasma mass spectrometry. The accuracy and precision of Mg isotopic compositions in GSR-1 and RGM-2 were assessed by repeated measurements over twelve months. The long-term tests show that the Mg isotopic compositions of the two low MgO felsic rocks (GSR-1 and RGM-2) are homogenous among batches and can be used as low MgO reference materials for accuracy assessments of Mg isotopic analyses. The Mg isotopic compositions (δ²⁶Mg) of GSR-1 and RGM-2 were marked as -0.223‰±0.053‰ (2s, n=50) and -0.184‰±0.058‰ (2s, n=50) respectively.

中文翻译：

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GSR-1和RGM-2的镁同位素同质性：低MgO长质岩石的Mg同位素分析的两个潜在标准

在样品制备和质谱分析中，样品溶解，柱化学，浓度失配和基质效应在镁同位素分析过程中具有引入分析假象的巨大潜力。基于长英质岩石中MgO含量低和不良基质元素的特点，制定完善的长英质标准对于减少实验室间质量偏差，评估数据准确性以及促进不同实验室化学分离程序的比较至关重要。 。在这项工作中，由于MgO含量低，对两种长英质岩石标准GSR-1和RGM-2的均质性和长期稳定性进行了评估。此外，使用多收集器电感耦合等离子体质谱法，使用掺杂了基质元素的合成溶液评估潜在的Mg同位素分析假象。通过十二个月的重复测量评估了GSR-1和RGM-2中Mg同位素组成的准确性和精密度。长期测试表明，两个低MgO长英质岩石（GSR-1和RGM-2）的Mg同位素组成在批次之间是均匀的，可用作低MgO参考材料，用于评估Mg同位素分析的准确性。镁同位素组成（δ 长期测试表明，两个低MgO长英质岩石（GSR-1和RGM-2）的Mg同位素组成在各批次之间是同质的，可用作低MgO参考材料，用于评估Mg同位素分析的准确性。镁同位素组成（δ 长期测试表明，两个低MgO长英质岩石（GSR-1和RGM-2）的Mg同位素组成在批次之间是均匀的，可用作低MgO参考材料，用于评估Mg同位素分析的准确性。镁同位素组成（δGSR-1和RGM-2（²⁶ Mg）分别标记为-0.223‰±0.053‰（2 s，n = 50）和-0.184‰±0.058‰（2 s，n = 50）。