By Philippe Quevauviller
Offers an summary of modern experiences played by means of quite a lot of EC laboratories which has ended in the release of collaborative initiatives to enhance the state-of-the-art of speciation research in Europe. Discusses the options used, their functionality as utilized to real-case analyses and attainable resources of blunders.
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Additional info for Method performance studies for speciation analysis
G. for ECD, AAS). It is 18 Chapter 2 therefore of primary importance to evaluate this linear range before starting the analysis. Techniques involving a derivatization step require special caution for their calibration. g. in the case of standard additions, spiked extracts will be derivatized, undergo separation and final detection. However, the compounds which are actually separated are in derivatized forms and not in their original anionic forms anymore. Thus tributyltin chloride present in a sample may be derivatized into tributyltin hydride (when hydride generation is used) or pentylated tributyltin (when a Grignard reaction is used, in this case pentylation).
When the results are of insufficient quality), which necessitates the extension of the duration of the programme. All participants should preferably commit themselves at the start of the project to maintain their participation over the entire study. General Principles In chemical analysis, the substances to be determined are rarely directly measurable and sample pre-treatment is in most cases necessary to convert or separate the analyte in a form that is compatible with the measurement system. g.
This preliminary meeting also enables the collection of the existing knowledge on previous studies and available techniques, and to establish clearly a strategy in relation to the determinands and matrices to be selected. In particular, the choice of the determinands and matrices should be based on the feasibility of preparation of homogeneous and stable samples. The improvement scheme should include a series of meetings between the different exercises so that the outcome of each evaluation can be discussed with all participants in order to draw conclusions and prepare the next exercises.