铁同位素分析测试技术研究进展

秦燕; 徐衍明; 侯可军; 李延河; 陈蕾

doi:10.15898/j.cnki.11-2131/td.201908120120

铁同位素分析测试技术研究进展

1.
自然资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037

2.
青岛地质工程勘察院(青岛地质勘查开发局), 山东青岛 266071

基金项目:
中央级公益性科研院所基本科研业务费专项（JYYWF20180104）

详细信息

作者简介: 秦燕, 博士, 副研究员, 主要研究方向为同位素地球化学。E-mail:happyqinyan@sina.com

通讯作者: 侯可军, 博士, 副研究员, 主要研究方向为同位素地球化学。E-mail:kejunhou@126.com

中图分类号: O628

收稿日期: 2019-08-12

修回日期: 2019-09-17

录用日期: 2019-10-21

Progress of Analytical Techniques for Stable Iron Isotopes

1.
Key Laboratory of Metallogeny and Mineral Assessment, Ministry of National Resources; Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

2.
Qingdao Geological Engineering Survey Institute(Qingdao Geological Exploration and Development Bureau), Qingdao 266071, China

More Information

Corresponding author: Ke-jun HOU, kejunhou@126.com

Received Date: 12 August 2019

Revised Date: 17 September 2019

Accepted Date: 21 October 2019

摘要

摘要: 铁是地球上丰度最高的变价元素，在自然界大量分布于各类矿物、岩石、流体和生物体中，并广泛参与成岩作用、成矿作用、热液活动和生命活动过程。铁同位素组成对地球化学、天体化学和生物化学方面提供重要的信息，是同位素地球化学研究领域的热点。铁同位素的精确测量是开展相关研究的重要基础。本文评述了铁同位素测试技术的研究进展，主要包括：①溶液法测试铁同位素样品纯化过程中阴离子树脂的改进；②质谱分析从传统的热电离质谱法发展为多接收电感耦合等离子体质谱法；③激光微区原位测试技术的研发等。在此基础上，对测试过程中会导致产生铁同位素分馏的步骤和校正方法进行了总结，并对各种测试方法的优缺点进行了评述。本文认为：溶液法分析流程长且复杂，但分析精度高（0.03‰，2SD）、方法稳定；微区原位分析方法从纳秒激光剥蚀发展为飞秒激光剥蚀，脉冲持续时间更短、脉冲峰值强度更高（可达10¹²W），聚焦强度超过10²⁰W/cm²，使其具有分析速度快、空间分辨率高的优势。微区原位法可以从微观角度去讨论铁同位素变化的地球化学过程，但基体效应的存在限制了微区原位铁同位素的广泛应用。因此，缩短溶液法分析流程，开发系列基体匹配的标准样品，是铁同位素分析方法研发的方向。
- 铁同位素 /
- 化学提纯 /
- 溶液法 /
- 质谱 /
- 激光剥蚀 /
- 基体效应
Abstract: BACKGROUNDIron is the most abundant element on earth with variable valences. It is widely distributed in various minerals, rocks, fluids and organisms, and is involved in diagenesis, mineralization, hydrothermal activities and life activities. The study of iron isotope composition provides important information for geochemistry, astrochemistry and biochemistry. The accurate measurement of Fe isotopes is an important basis for the development of related research. OBJECTIVESTo summarize the research progress of Fe isotope measurement technology. METHODSThe current chemical separation and purification methods and main instrumental analysis techniques commonly used for iron isotopes, were compared and analyzed in this review, and the mechanism of different types of fractionations during mass spectrometry were discussed. These advances included:(1) Improvement of anion resin during determination of iron isotope by solution method; (2) Mass spectrometry development from traditional thermal ionization mass spectrometry to multi-collector inductively coupled plasma mass spectrometry; (3) Development of laser in situ analytical technology. On this basis, the steps and calibration methods that would cause iron isotope fractionation during the analysis were summarized, and the advantages and disadvantages of different analytical methods were reviewed. RESULTSThe analysis process of solution method was long and complicated, but the precision was high (0.03‰, 2SD) and the method was stable. In situ iron isotope analysis method developed from nanosecond laser denudation to femtosecond laser denudation, with shorter pulse duration, higher pulse peak intensity (up to 10¹²W), and focusing intensity exceeding 10²⁰W/cm². In situ iron isotope analysis method was fast and had high spatial resolution, which can be used to discuss the geochemical process from the microscopic perspective. However, the presence of matrix effects limited the widespread use of iron isotopes. CONCLUSIONSShortening solution analysis process and developing a series of matrix-matched standard samples are the research direction of iron isotope analysis.
- iron isotope /
- chemical separation /
- solution method /
- mass spectrometry /
- laser ablation /
- matrix effect

HTML全文

图 1 Fe与基质的化学分离淋洗曲线^[33]

Figure 1.

下载: 全尺寸图片幻灯片

图 2 高分辨率模式下铁同位素与干扰峰的谱峰^[33]

Figure 2.

下载: 全尺寸图片幻灯片

图 3 飞秒激光和纳秒激光剥蚀出气溶胶的粒径对比^[91]

Figure 3.

下载: 全尺寸图片幻灯片

图 4 水蒸汽对飞秒激光和纳秒激光基质效应的抑制对比^[93]

Figure 4.

下载: 全尺寸图片幻灯片

表 1 某些潜在的铁同位素谱峰干扰信号^[35]

Table 1. Some potential isobaric interferences on Fe isotope signals^[35]

质量数	待测核素	同质异位素	多原子离子
54	⁵⁴Fe⁺	⁵⁴Cr⁺	[⁴⁰Ar¹⁴N]⁺，[²⁷Al²⁷Al]⁺，[⁴⁰Ca¹⁴N]⁺，[⁴²Ca¹²C]⁺
56	⁵⁶Fe⁺	-	[⁴⁰Ar¹⁶O]⁺，[⁴²Ca¹⁴N]⁺，[²⁸Si²⁸Si]⁺
57	⁵⁷Fe⁺	-	[⁴⁰Ar¹⁷O]⁺，[⁴⁰Ar¹⁶O¹H]⁺
58	⁵⁸Fe⁺	⁵⁸Ni⁺	[⁴⁰Ar¹⁸O]⁺

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