Here we present a convenient and efficient procedure for separating Ti from matrix elements in geological samples using a dual-column loaded with Ln-spec and AG50W-X12 resins. Boric acid was adopted to reduce the use of HF and to avoid precipitation of Ti. Ln-spec resin was used to remove most of the matrix elements. The residual matrix elements, such as Mo, V, Cr and trace Fe, were further removed using a column filled with AG50W-X12 resin. This procedure results in a Ti recovery near 100% with very low matrix element concentrations in the final Ti solution which has little influence on the measurement of Ti isotopes. Ti isotope measurement was carried out on a Neptune Plus multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) with a standard-sample-standard bracketing technique. The intermediate precision of the NIST SRM 3162a solution for δ⁴⁹Ti was 0.047‰ (2SD, N = 130). The δ⁴⁹Ti_OL-Ti values (recalculated to the OL-Ti standard) of 14 geological reference materials and six kinds of minerals selected from a quartz monzonite were measured using this method, and the results of the reference materials were in good agreement with the published results within analytical error. The 14 geological reference materials display large δ⁴⁹Ti variations up to 1.7‰. Meanwhile, the variations of δ⁴⁹Ti_OL-Ti values of the six minerals are up to 1.5‰, indicating significant Ti isotope fractionation during the mineral crystallization process. Therefore, the analytical procedure established here provides a powerful tool to investigate Ti isotope variations. The results of the geological samples in this study show the potential application of Ti isotopes in tracing geological processes.

中文翻译：

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MC-ICP-MS测定地质样品中钛的新方法，用于49Ti / 47Ti比值的测量

在这里，我们介绍了一种方便高效的方法，可使用装有Ln-spec和AG50W-X12树脂的双柱从地质样品中的基质元素中分离出Ti。采用硼酸可减少HF的使用并避免Ti的沉淀。Ln-spec树脂用于去除大多数基质元素。使用填充有AG50W-X12树脂的色谱柱进一步除去残留的基质元素，例如Mo，V，Cr和痕量Fe。该方法可导致最终钛溶液中的基质元素浓度非常低时，钛回收率接近100％，对钛同位素的测量几乎没有影响。Ti同位素的测量是在Neptune Plus多收集器电感耦合等离子体质谱仪（MC-ICP-MS）上使用标准样品-标准括号技术进行的。⁴⁹ Ti为0.047‰（2SD， N = 130）。的δ ⁴⁹的Ti _OL-Ti系数值的14地质参考资料六种从石英二长选择矿物质（重新计算到OL-钛标准）使用该方法测定，和参考材料的结果与吻合分析误差范围内的已发布结果。14种地质参考材料显示大的δ ⁴⁹的Ti的变化高达1.7‰。同时， ^δ49 Ti _{OL-Ti的变化}六种矿物的最高分值达1.5‰，说明矿物结晶过程中Ti同位素分馏明显。因此，此处建立的分析程序为研究Ti同位素变化提供了有力的工具。这项研究中的地质样品结果表明，Ti同位素在追踪地质过程中具有潜在的应用价值。