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Additional info for Determination of Anions in Natural and Treated Waters
Mercury comes into contact only with the purest inert gas and plastic free of metal traces. Filling is seldom required and very simple to carry out. The system uses glass capillaries which can be exchanged simply and rapidly. Up to 30 complete analytical methods (including all detailed information and instructions) can be filled in a non-volatile memory and called up. Consequently, a large extensive and correspondingly efficient library of analytical methods can be built up, comprehensive enough to carry out all routine determinations conveniently via call-up of a stored method.
The optimal method is best selected by a comprehensive and objective review of all commonly used techniques. Overriding criteria which will influence the selection are resolution, sensitivity and speed. While the very best chromatogram for any given method will inevitably be a compromise, only the fullest evaluation of all the alternatives offered will guarantee a correct selection. Certainly, a vast amount of experience has been gained by the widespread use of conventional amino acid analysers.
The classical XRF spectrometer which has been commercially available since the 1950s uses crystal structures to separate (resolve) the X-rays emanating from the fluorescence process in the irradiated specimen. These crystals diffract the characteristic X-rays from the elements in the specimen, allowing them to be separated and measured. The characteristic fluorescent X-rays are said to have been separated from each other by the process of ‘wavelength dispersion’ (WDXRF). Each element emits characteristic lines which can be separated by WDXRF before being individually counted.