Citation: ZHANG Jun-Wen, MENG Jun-Lun, ZHAO Zhi-Qi, LIU Cong-Qiang. 多接收电感耦合等离子质谱法准确测定天然地质样品中的锂同位素组成[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(3): 415-422. doi: 10.19756/j.issn.0253-3820.181444 shu

多接收电感耦合等离子质谱法准确测定天然地质样品中的锂同位素组成

1.
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2.
School of Environmental Studies, China University of Geosciences, Wuhan 430071, China;
3.
University of Chinese Academy of Sciences, Beijing 100049, China;
4.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China

Received Date: 5 July 2018
Revised Date: 28 December 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 41661144042, 41673124, 41603018) and the Fundamental Research Funds for the Central Universities of Chang'an University (No. 300102278302).

准确测定天然地质样品中Li同位素组成是Li同位素地球化学研究的基础。本研究采用AG 50W-X12（200~400目，1.5 mL）阳离子树脂，以0.4和1.0 mol/L HCl作为淋洗介质，建立了适用于不同类型地质样品，且简单、高效的化学分离Li的方法。分离水样和岩石中的Li时，仅需8.5和14.0 mL淋洗液，与前人方法对比（25~190 mL），大大降低了淋洗液使用量，且流程空白信号（（2.4±0.1）mV）与使用的2% HNO₃的信号（2.3 mV）几乎一致。在淋洗过程中会发生明显的Li同位素分馏，当Li回收不完全时，测得的δ⁷Li值相差最高达~50‰，而完全回收Li可以避免该偏差。测定了部分国际标准物质的Li同位素组成：海水δ⁷Li值为+31.4‰±0.7‰（n=18），安山岩AGV-2为+7.2‰±0.2‰（n=4），玄武岩BCR-2为+3.7‰±0.7‰（n=8），花岗闪长岩GSP-2为-0.10‰±0.18‰（n=4），与已报道的数据吻合，分析精度优于0.8‰，达到国际同类实验室水平。本方法在保证回收率的前提下，树脂和试剂的使用量减少为文献报道使用量的50%，甚至更低，提高了工作效率，并降低了流程空白，可操作性和实用性更强。
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