High precision measurements of gallium isotopic compositions in geological materials by MC-ICP-MS

被引:29
作者
Zhang, Ting [1 ]
Zhou, Lian [1 ]
Yang, Lu [2 ]
Wang, Qian [1 ]
Feng, Lan-ping [1 ]
Liu, Yong-Sheng [2 ]
机构
[1] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
[2] Natl Res Council Canada, 1200 Montreal Rd, Ottawa, ON K1A 0R6, Canada
基金
中国国家自然科学基金;
关键词
SOURCE-MASS-SPECTROMETRY; DISCRIMINATION CORRECTION; EXCHANGE CHROMATOGRAPHY; ATOMIC WEIGHTS; AMOUNT RATIOS; INDIUM; IRON; CU; FRACTIONATION; COMPLEXATION;
D O I
10.1039/c6ja00202a
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An analytical protocol for the accurate and precise determination of the gallium isotope ratio in geological materials is presented for the first time by using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). Separation of Ga from natural sample matrices was achieved by using a three-column ion-exchange chromatograph with one anion exchange AG MP-1M column and two cation exchange AG 50W-X8 columns. This approach provides an efficient purification with a low blank and high yield of Ga from an excess amount of Fe existing in geological samples. The instrument mass bias was monitored and corrected by using a model of standard-sample bracketing with internal normalization, and copper was used as an internal standard which was added to both the sample and standard solutions. The long-term external reproducibility of delta Ga-71/69 obtained is 0.04 parts per thousand (2SD). Ga isotopic compositions of geological reference materials including basalt, andesite, rhyolite, granodiorite, soil, sediment, carbonatite and shale were measured using the proposed approach. The Ga-71/Ga-69 ratio in these geological reference materials spanned over a rather narrow range between 0.74 parts per thousand and 0.90 parts per thousand, relative to NIST SRM 994.
引用
收藏
页码:1673 / 1679
页数:7
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