Related matrices

Sequential extraction has been applied to a variety of amended soils and soil-like materials. Some recent examples are discussed below. 

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Randic M, Pompe M (2001b) The variable molecular descriptors based on distance related matrices. J. Chem. Inf. Comput. Sci. 41 575-581. 

Unitary matrices allow one to transform matrices A to closely related matrices A by similarity transformations of the form... 

Table 12. Analytical methods for aluminum investigation in biological and biological related matrices... 

It should be added here that these huge reaction networks have to be generated by computer [Baltanas Froment, 1985]. Booleans relation matrices were used to describe the molecules and carbenium ions. Since a component analysis of a vacuum gas oil is not entirely feasible some lumping is inevitable but the rate coefficients for the reactions between the lumps can be constructed from those of the single events entering in the reactions of the components of the lump [Vynckier Froment, 1991]. 

The approach to hydrocarbon cracking taken by the Froment school is to model the actual elementary steps of radicals at the various molecular configurations [38]. These are relatively few initiation hydrogen abstraction from a primary, secondary, or tertiary carbon and radical decomposition by scission of a carbon-carbon bond in /3-position to the unpaired electron. Boolean relation matrices are used to reflect the structures of the hydrocarbon reactants by indicating the existence and location of all their carbon-carbon bonds. Computer software generates reaction networks on the basis of known rate coefficients and activation energies at the various positions. Froment states the number of components in naphtha cracking as around 200, that of radicals as 40, and that of elementary radical steps... 

Many laboratories have gathered extensive experience in the application of ion chromatography (IC) for the analysis of inorganic and organic anions. Small carboxylate anions. Groups lA and IIA cations, and heavy metal ions have been identified in tobacco and tobacco smoke by this method. Several of these applications have been presented as tobacco journal (250) and tobacco conference [TCRC (2951), TSRC(1273)] papers. At the 1999 TSRC, Perini (20A85) presented a method associated with IC called transition metal IC (TMIC). TMIC can be used for specific resolution and specia-tion of transition metal ions in tobacco and related matrices. Perini showed that TMIC could be used to detect and spe-ciate at least nineteen transition metal ion. 

A85. Perini, F.R. Multiple transition metal ion analysis by ion chromatography in tobacco and related matrices ... 

Figure 1 Applications (%) of (A) spectrophotometric determinations of cationic species and related matrices and (B) spectrophotometric determinations of anionic species and related matrices.

Carbamate and organophosphate pesticides Food-related matrices (whole milk, muscle tissue, Uver tissue, corn silage) QuEChERS... 

Filigenzi, M. S., Ehrke, N., Aston, L. S., and Poppenga, R. H. 2011. Evaluation of a rapid screening method for chemical contaminants of concern in four food-related matrices using QuEChERS extraction, UHPLC and high resolution mass spectrometry. FoodAddit. Contam., PartA 28 1324-1339. 

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