Analysis of trace metals (Cu, Cd, Pb, and Fe) in seawater using single batch nitrilotriacetate resin extraction and isotope dilution inductively coupled plasma mass spectrometry
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Author(s)
Lee, Jong-Mi
Fitzsimmons, Jessica Nicole
Zhang, Ruifeng
Boyle, Edward A
Echegoyen Sanz, Yolanda
Kayser, Richard A
Date Issued
December 2010
Journal
Analytica Chimica Acta
Publisher
Elsevier
Citation
Lee, Jong-Mi, Edward A. Boyle, Yolanda Echegoyen-Sanz, Jessica N. Fitzsimmons, Ruifeng Zhang, and Richard A. Kayser. “Analysis of Trace Metals (Cu, Cd, Pb, and Fe) in Seawater Using Single Batch Nitrilotriacetate Resin Extraction and Isotope Dilution Inductively Coupled Plasma Mass Spectrometry.” Analytica Chimica Acta 686, no. 1–2 (February 2011): 93–101.
Version
Author's final manuscript
Abstract
A simple and accurate low-blank method has been developed for the analysis of total dissolved copper, cadmium, lead, and iron in a small volume (1.3–1.5 mL per element) of seawater. Pre-concentration and salt-separation of a stable isotope spiked sample are achieved by single batch extraction onto nitrilotriacetate (NTA)-type Superflow® chelating resin beads (100–2400 beads depending on the element). Metals are released into 0.1–0.5 M HNO[subscript 3], and trace metal isotope ratios are determined by ICPMS. The benefit of this method compared to our previous Mg(OH)2 coprecipitation method is that the final matrix is very dilute so cone-clogging and matrix sensitivity suppression are minimal, while still retaining the high accuracy of the isotope dilution technique. Recovery efficiencies are sensitive to sample pH, number of resin beads added, and the length of time allowed for sample–resin binding and elution; these factors are optimized for each element to yield the highest recovery. The method has a low procedural blank and high sensitivity sufficient for the analysis of pM–nM open-ocean trace metal concentrations. Application of this method to samples from the Bermuda Atlantic Time-Series Study station provides oceanographically consistent Cu, Cd, Pb, and Fe profiles that are in good agreement with other reliable data for this site. In addition, the method can potentially be modified for the simultaneous analysis of multiple elements, which will be beneficial for the analysis of large number of samples.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.aca.2010.11.052
