Measurement of zinc stable isotope ratios in biogeochemical matrices by double-spike MC-ICPMS and determination of the isotope ratio pool available for plants from soil

被引:91
作者
Arnold, Tim [1 ,2 ]
Schoenbaechler, Maria [2 ,3 ]
Rehkaemper, Mark [2 ]
Dong, Schuofei [2 ]
Zhao, Fang-Jie [4 ]
Kirk, Guy J. D. [5 ]
Coles, Barry J. [2 ]
Weiss, Dominik J. [2 ,6 ]
机构
[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
[2] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London SW7 2AZ, England
[3] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester M13 9PL, Lancs, England
[4] Rothamsted Res, Harpenden AL5 2JQ, Herts, England
[5] Cranfield Univ, Natl Soil Resources Inst, Cranfield MK3 0AL, Beds, England
[6] Nat Hist Museum, London SW7 5PD, England
基金
英国生物技术与生命科学研究理事会;
关键词
Zinc isotopes; Stable isotope fractionation; Soil biogeochemistry; Double-spike; Mass bias correction; MC-ICPMS; SOURCE-MASS SPECTROMETRY; PRECISE ZN; FRACTIONATION; CU; DISCRIMINATION; CADMIUM; ADSORPTION; METEORITES; RESERVOIRS; DEPOSITION;
D O I
10.1007/s00216-010-4231-5
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Analysis of naturally occurring isotopic variations is a promising tool for investigating Zn transport and cycling in geological and biological settings. Here, we present the recently installed double-spike (DS) technique at the MAGIC laboratories at Imperial College London. The procedure improves on previous published DS methods in terms of ease of measurement and precisions obtained. The analytical method involves addition of a Zn-64-Zn-67 double-spike to the samples prior to digestion, separation of Zn from the sample matrix by ion exchange chromatography, and isotopic analysis by multiple-collector inductively coupled plasma mass spectrometry. The accuracy and reproducibility of the method were validated by analyses of several in-house and international elemental reference materials. Multiple analyses of pure Zn standard solutions consistently yielded a reproducibility of about +/- 0.05 parts per thousand (2 SD) for delta Zn-66, and comparable precisions were obtained for analyses of geological and biological materials. Highly fractionated Zn standards analyzed by DS and standard sample bracketing yield slightly varying results, which probably originate from repetitive fractionation events during manufacture of the standards. However, the delta Zn-66 values (all reported relative to JMC Lyon Zn) for two less fractionated in-house Zn standard solutions, Imperial Zn (0.10 +/- 0.08 parts per thousand: 2 SD) and London Zn (0.08 +/- 0.04 parts per thousand), are within uncertainties to data reported with different mass spectrometric techniques and instruments. Two standard reference materials, blend ore BCR 027 and ryegrass BCR 281, were also measured, and the delta Zn-66 were found to be 0.25 +/- 0.06 parts per thousand (2 SD) and 0.40 +/- 0.09aEuro degrees, respectively. Taken together, these standard measurements ascertain that the double-spike methodology is suitable for accurate and precise Zn isotope analyses of a wide range of natural samples. The newly installed technique was consequently applied to soil samples and soil leachates to investigate the isotopic signature of plant available Zn. We find that the isotopic composition is heavier than the residual, indicating the presence of loosely bound Zn deposited by atmospheric pollution, which is readily available to plants.
引用
收藏
页码:3115 / 3125
页数:11
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