New matrix-free reference material for ethene in the form of optical fibres
- PDF / 316,855 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 21 Downloads / 157 Views
TECHNICAL NOTE
New matrix-free reference material for ethene in the form of optical fibres Marta Słomińska & Piotr Konieczka & Jacek Namieśnik
Received: 27 August 2012 / Revised: 8 November 2012 / Accepted: 13 November 2012 / Published online: 14 December 2012 # The Author(s) 2012. This article is published with open access at Springerlink.com
Abstract Reference materials are indispensable in the quality control and quality assurance of analytical measurements. One novel approach to the generation of standard gaseous mixtures of toxic, reactive, volatile, labile, and malodorous substances involves thermal decomposition or rearrangement, under defined temperature conditions, of compounds immobilized, by chemical bonding, on the surface of an appropriate carrier to release specific amounts of a volatile compound. In this technique the type of support used to immobilize the compound is extremely important, because the amount of analyte released depends directly on the choice of material. In this paper we report the novel preparation of a matrix-free ethene standard in the form of glass fibres coated with a thin layer of aluminium, the surface of which is modified by reaction with a specific compound. As a result of thermal decomposition of this compound, gaseous ethene is formed. In this paper we present the results obtained from tests of stability and homogeneity, two properties of crucial importance in the preparation of reference materials, by comparison of a series of results obtained for randomly chosen samples of the reference material. Interlaboratory comparative studies resulted in determination of a reference value for the ethene formed after thermal decomposition of the surface compound ((2.12±0.14) ng per fibre). Keywords Air . Gases . Reference materials . Quality assurance . Control
Introduction Use of standards with matrix compositions and analyte concentrations resembling those of environmental samples M. Słomińska (*) : P. Konieczka : J. Namieśnik Chemical Faculty, Department of Analytical Chemistry, Gdansk University of Technology, Narutowicza 11/12 Str, 80-233 Gdansk, Poland e-mail: [email protected]
enhances the reliability of analytical results [1–7]. Preparation of standard gas mixtures is much more difficult than the manufacture of liquid and solid reference materials (because of the character of many gaseous compounds—toxic, reactive, volatile, and unstable). Methodological approaches for producing matrix-free standards of gas mixtures have advanced rapidly in recent years. Among static and dynamic techniques available for the preparation of standard gas mixtures, thermal decomposition of a surface compound has recently become popular [8–11]. At the Department of Analytical Chemistry of Gdansk University of Technology, research on the application of thermal-decomposition techniques has been conducted for 15 years. These studies have been focused on: 1. chemical modification of appropriate solid materials to obtain the desired surface compounds; 2. determination of optimum conditions fo
Data Loading...
