NDLI: Effects of sample preparation and calibration strategy on accuracy and precision in the multi-elemental analysis of soil by sector-field ICP-MS

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Effects of sample preparation and calibration strategy on accuracy and precision in the multi-elemental analysis of soil by sector-field ICP-MS

Content Provider	Royal Society of Chemistry (RSC)
Author	Pönni, Seppo Engström, Emma Stenberg, Anna Baxter, Douglas C. Malinovsky, Dmitry Mäkinen, Irma Rodushkin, Ilia
Copyright Year	2004
Abstract	Soil samples were prepared for multi-element analysis using HNO3 leaching or pseudo-total digestion with HNO3, HCl and HF in a microwave oven, both methods requiring 70 min heating time. Two calibration approaches for the soil characterization were also compared: external calibration, combined with internal standardization, and isotope dilution (ID) after appropriate spiking of the soils with a stable isotope mixture prior to sample preparation. Analyses were performed using inductively coupled plasma sector field mass spectrometry (ICP-SFMS). Accurate total elemental concentrations were only obtained for Cd and P using both sample preparation methods in two certified reference materials, NIST SRM 2709 and CCRMP SO-2, as well as comparable values for a Finnish inter-laboratory soil. The pseudo-total digestion method also provided accurate results for As, Be, Co, Fe, Mn, Ni, Pb, Sb, Ti, V and Zn. For Cu in SO-2 and Cr in both certified reference materials, incomplete recoveries were always obtained. In the case of Cr, this is due to difficulties associated with the complete solubilization of refractory minerals. For a given final dilution factor, external calibration provides better limits of detection (LODs) than ID. As both methods of quantification yield results of essentially equivalent accuracy and precision, external calibration is to be preferred as a greater number of elements are amenable to analysis in a shorter measurement time. On the other hand, ID can be combined with matrix separation (NH3 precipitation was used here), allowing lower dilution factors to be used without deleterious effects on the instrumental performance. In particular, improved LODs could be obtained for Cd, Cu and Hg, primarily as a result of being able to introduce ten-fold more concentrated solutions from which the bulk of the matrix had been removed. For Cu and Ni, matrix separation almost eliminated Ti, and thus the formation of spectrally interfering TiO+ was completely suppressed. Potentially, the combination of ID and matrix separation would allow these elements to be determined without resorting to medium resolution measurement mode, again improving the LODs for the determination by ID-ICP-SFMS.
Starting Page	858
Ending Page	866
Page Count	9
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	19
Issue Number	7
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/b315283a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	NIST Cu Nitric acid Hydrochloric acid Hydrogen fluoride Microwave oven Isotope Inductively coupled plasma Mass spectrometry National Institute of Standards and Technology Finnish language Lead Positive-definite matrix Ammonia
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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