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Measurement of the Isotopic Composition of Molybdenum in Geological Samples by MC‐ICP‐MS using a Novel Chromatographic Extraction Technique
Author(s) -
Li Jie,
Liang XiRong,
Zhong LiFeng,
Wang XuanCe,
Ren ZhongYuan,
Sun ShengLing,
Zhang ZhaoFeng,
Xu JiFeng
Publication year - 2014
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2013.00279.x
Subject(s) - chemistry , amberlite , inductively coupled plasma mass spectrometry , chromatography , extraction (chemistry) , fractionation , matrix (chemical analysis) , seawater , analytical chemistry (journal) , mass spectrometry , adsorption , geology , oceanography , organic chemistry
A novel preconcentration method is presented for the determination of M o isotope ratios by multi‐collector inductively coupled plasma‐mass spectrometry ( MC ‐ ICP ‐ MS ) in geological samples. The method is based on the separation of M o by extraction chromatography using N‐benzoyl‐N‐phenylhydroxylamine ( BPHA ) supported on a microporous acrylic ester polymeric resin (Amberlite CG ‐71). By optimising the procedure, M o could be simply and effectively separated from virtually all matrix elements with a single pass through a small volume of BPHA resin (0.5 ml). This technique for separation and enrichment of M o is characterised by high selectivity, column efficiency and recovery (~ 100%), and low total procedural blank (~ 0.18 ng). A 100 M o‐ 97 M o double spike was mixed with samples before digestion and column separation, which enabled natural mass‐dependent isotopic fractionation to be determined with a measurement reproducibility of < 0.09‰ (δ 98/95 M o, 2 s ) by MC ‐ ICP ‐ MS . The mean δ 98/95 Mo SRM 3134 ( NIST SRM 3134 Mo reference material; Lot No. 891307) composition of the IAPSO seawater reference material measured in this study was 2.00 ± 0.03‰ (2 s , n = 3), which is consistent with previously published values. The described procedure facilitated efficient and rapid Mo isotopic determination in various types of geological samples.