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M. Leiterer J. W. Einax C. Löser A. Vetter 《Analytical and bioanalytical chemistry》1997,359(4-5):423-426
An analytical method for the quantitative determination of Al, Ti, V, Cr, Co, Ni, Cu, Zn, Mo, Cd, Ti and Pb in plant samples
by ICP-MS has been developed. Spectral interferences, plant matrix effects, precision and accuracy are discussed. Results
are demonstrated for selected samples concerned with the mass balance of heavy metals after utilization of non-food vegetable
materials in a power plant.
Received: 7 January 1997 / Revised: 2 June 1997 / Accepted: 18 June 1997 相似文献
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J. W. Einax O. Kampe D. Truckenbrodt 《Fresenius' Journal of Analytical Chemistry》1998,361(2):149-154
Partial least squares regression (PLS) as a method for multivariate data analysis has been applied to environmental data
of the German rivers Saale, Ilm and Unstrut. Main aspects of the study are to describe the relationships of the distribution
of metals between river water and river sediment using PLS. A simulation of the distribution of metals between the liquid
and solid phase by variation of some parameters (e.g. conductivity, DOC, dissolved oxygen, pH, phosphate and suspended matter)
is presented and compared with experimental results.
Received: 15 July 1997 / Revised: 6 November 1997 / Accepted: 7 November 1997 相似文献
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The combination of sequential leaching methods for a first assessment of the kind of species in river sediments with multivariate-statistical methods (like factor analysis) for identifying anthropogenic and/or geogenic loading is useful for the differentiated characterization of the pollution state of a river. Electrochemical investigations, planned on the basis of statistical design and following empirical modelling, enables quantitative conclusions on the binding forms of heavy metals in river waters. Deposition-remobilisation effects of heavy metals in the complex system river water-river sediment can be described by PLS modelling. 相似文献
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Using the approach of Rulla (1996 SIAM J. Numer. Anal. 33, 68-87)for analysing the time discretization error and assuming moreregularity on the initial data, we improve on the error boundderived by Barrett and Blowey (1996 IMA J. Numer. Anal. 16,257-287) for a fully practical piecewise linear finite elementapproximation with a backward Euler time discretization of amodel for phase separation of a multi-component alloy. 相似文献
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Jürgen Einax Bernd Machelett Sabine Geiß Klaus Danzer 《Fresenius' Journal of Analytical Chemistry》1992,342(4-5):267-272
Summary The characterization of the heavy metal contents of a soil area is carried out by narrow screening sampling and subsequent analysis. It is possible by means of the univariate variance analysis to detect significant alterations within the tested area. The position and extent of multivariate changes of the features can be characterized more exactly with the help of multivariate statistical methods such as the combination of cluster and discriminant analytical methods or the principal component analysis. The maximum possible distance between two sampling points is determined by calculation of the autocorrelation function of the features. The number of soil samples, which is necessary for precisely determining the heavy metal contents of the investigated area, can be derived therefrom. With the help of the multivariate autocorrelation function the distance for the representative sampling of the multivariate loads by heavy metals can be described. 相似文献
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