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Abstract

Calibration in solid sampling Zeeman AAS (atomic absorption spectrometry) is a difficult step. The calibration curve is usually established making use of materials which supposedly have the same matrix composition as the sample. Differences between the matrix of the sample and the standard may cause a systematic error. In addition, since certified reference materials are generally used, the method ceases to be an independent analytical method and could not be used for certification of reference materials. In order to establish SS-ZAAS as an independent method, the first approach was to study the possibilities for achieving independent calibration using standard addition. This method is successful but rather time consuming and was applied for the determination of Cd and Zn in a BCR codfish CRM and for the determination of Ag in several Cu metal CRMs. The next step was to study systematically the behaviour of the specific signal (signal/analyte mass or signal/sample mass) as a function of both the sample mass or the analyte mass. If no matrix effect occurs, both curves would be horizontal on condition that the calibration curve is linear or the experiments are limited to the linear part of the calibration curve.

Additional information

Authors: PAUWELS J, JRC Geel (BE);HOFMANN C, JRC Geel (BE);VANDECASTEELE C, Katholieke Universiteit Leuven, Heverlee (BE)
Bibliographic Reference: Paper presented: 5th International Colloquium on Solid Sampling with Atomic Spectroscopy, Geel (BE), May 18-20, 1992
Availability: Available from (1) as Paper EN 36738 ORA
Record Number: 199210623 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en