Selection of analytical method

Vol. 16. Complexation in Analytical Chemistry A Guide for the Critical Selection of Analytical Methods Based on Complexation Reactions. By the late Anders Ringbom... 

Source Reprinted/retyped with permission from Analytical Problem Solving Selection of Analytical Methods, A.H. Ullman, T.M. Thorpe, and G.D. Boutilier in Encyclopedia of Analytical Chemistry, R.A. Meyers (Ed.), 2000. Copyright John Wiley Sons Limited. 

Analytical Problem Solving Selection of Analytical Methods Multivariate Image Analysis Quality Assurance in Analytical Chemistry Quantitative Spectroscopic Calibration... 

The groundwork for laboratory selection starts during the planning phase of the data collection process. By having identified the intended use of the data (Step 1), the regulatory framework (Step 2), and action levels and appropriate reporting limits (Step 3) in the course of the DQO process, we narrow down the alternatives for the selection of analytical methods. By evaluating the possible matrix limitations (Step 4), such as matrix interferences and their effects on the RLs, we will further refine the... 

Selection of analytical methods on the basis of specificity and sensitivity. 

As stated earlier, the sample acts as a "glue" between method and instrument. The use of more and more sophisticated methods and instruments is required as the matrix becomes more and more complex. Also, within the logical quality-quantity-structure chain, "the selection of analytical methods and of the corresponding instrumentation is a consequence of correct knowledge of the sample s history and homogeneity."23... 

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Ringbom, A., Complexation in Analytical Chemistry, Vol. 16, Chemical Analysis, Interscience-Wiley, 1963 (critical guide for selection of analytical methods based on complexes). 

Selectivity coefficients are useful figures of merit for describing the selectivity of analytical methods. I Itifor-tunately. they arc not widely u.sed except to characterize the performance of ion-selective electrodes (C hap-ter 23). Kxample 1-3 illustrates the use of selectivity coefficients when they are available. 

The basis for comparability of chemical analyses is the relation to standard reference materials of which the contents or concentrations are exactly known. The elements and compounds contained in a sample are preferably traced back to the mol. Problems in traceability of chemical analyses frequently result from the limited selectivity of analytical methods. Determination of the mass... 

GC chromatographic retention times were recorded to facilitate identification by retention index data. Chromatographic methods were used to indicate the presence of any impurities in the commercial chemicals. Samples of the reference substances are available on request and the collection of spectra and other information will be made available in printed format and on-line through the Internet. Van Lierop and co-workers [5] give an overview of the work done to establish the reference collection and the spectral atlas, which together will assist enforcement laboratories in the characterisation of plastics and the selection of analytical methods for additives that may migrate. 

The selection of analytical methods for determining soil properties may vary depending on several factors including the objectives of soil testing the speed at which the soil analysis must be done where the soil analysis will occur (i.e., in the field or laboratory) the native properties of the soil whether the soil can be disturbed the cost and speed of the analysis the accuracy and precision of the method any imposed requirements for standard testing and quality control procedures the availability of information to interpret the analytical results the... 

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