Current interlaboratory precision of exchangeable soil fraction measurements |
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Authors: | Manfred Sager |
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Institution: | Bundesamt und Forschungszentrum für Landwirtschaft, Institut für Agrar?kologie, Analytik III, Spargelfeldstrasse 191, A-1226 Wien, Austria Tel.: +43-1-73216-3203 Fax: +43-1-73216?3107 e-mail: msager@bfl.at, AT
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Abstract: | In addition to conventional aqua regia and EDTA extracts for monitoring trace metals in soils, the technique of examining
exchangeable soil fractions has been suggested to estimate soil contamination and trace metal availability to plants. In order
to establish a useful method for soil monitoring, interlaboratory precision as a primary selection criterion has been investigated.
In order to assess the quality of data provided by laboratories participating in the organization of the Austrian Governmental
Agricultural Research Institutes (ALVA), three soil samples have been analysed in a common ring test, annually, for the last
20 years. In addition to the annual list of parameters used for soil monitoring, within ALVA two NH4-acetate extracts were run in 1994, three NH4-acetate and NH4NO3 extracts in 1995 and three LiCl extractions in 1998. The procedures were tested for analytical precision and environmental
indications in up to 12 laboratories, with respect to Cd, Cr, Cu, Ni, Pb and Zn. Due to the low extraction efficiency, for
determinations in the resultant solutions, graphite furnace AAS was preferably selected, except for Zn and Cu. Flame-AAS and
ICP-OES were not sensitive enough for non-contaminated sites. Interlaboratory precision of the data was in the range 10–65%
coeff.var., and thus within the range of data given in the appendix of DIN 19730 (NH4NO3), as well as in a previous BCR report. Indications from exchangeable fractions seemed to be good for Zn and Cu, whereas they
were impossible for Cr.
Received: 25 October 1998 / Accepted: 26 January 1999 |
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Keywords: | Interlaboratory precision Trace metals Exchangeable fractions in soils Harmonized procedure |
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