Reliability of synthetic powder standards for atomic emission spectrometry

Rokosz, A.; Strycharski, P.

doi:10.1007/bf00470632

Cited by 2 publications

(2 citation statements)

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“…The spectra of analytical samples and corresponding standards were always recorded together on the same photographic plate. Optical density measurements, performed with a microphotometer MD-100 Carl Zeiss Jena, were repeated three times for each spectral line and background, and converted to concentration values by means of a calibration equation (Rokosz & Strycharski, 1988). The calibration curve was provided by 10 samples of the Bar kaolinite treated with H2SO 4 for various periods, for which the Fe content had been determined with atomic absorption spectroscopy and ranged from 0.5%-11-5% Fe203.…”

Section: Iron Determinationmentioning

confidence: 99%

On the Possibility of Removal of Non-Structural Iron from Kaolinite-Group Minerals

Bahranowski

Serwicka

Stoch³

et al. 1993

Clay miner.

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The efficiency of removal of the free iron from kaolinite-group minerals by means of acid leaching was followed by chemical, AES, XRD and ESR analyses. Structural Fe responsible for the g = 4 ESR signal represented only a small fraction of Fe impurity in the natural samples. The remaining non-structural Fe was found to exist both as forms easily extractable with acid, as well as deposits that were moderately resistant to the acid treatment. At least part of the latter could be associated with the broad g ~- 2 ESR signal typical of clustered Fe 3+ ions, which in most samples persisted even after prolonged acid leaching. The data demonstrate that procedures commonly used to clean kaolinite of free iron are by no means 100% efficient. In particular, frequently encountered quantitative association of the Fe remaining in the deferrated solids with purely structural Fe, homogeneously distributed in the kaolinite matrix, is probably significantly overestimated and should be treated with great caution.

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Section: Iron Determinationmentioning

confidence: 99%

On the Possibility of Removal of Non-Structural Iron from Kaolinite-Group Minerals

Bahranowski

Serwicka

Stoch³

et al. 1993

Clay miner.

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“…The linear regression model has been proposed for the study of homogeneity of solids 7 . As reference substances were proposed large, particularly pure, crystals 8 .…”

Section: General Aspectsmentioning

confidence: 99%

Analytical Chemistry in Poland

Hulanicki¹,

Witkicewicz²

2000

Analytical Letters

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The paper presents the main achievements of analytical chemistry in Poland on the basis of papers published mainly in the last decade. The selection is somewhat arbitrary but should show the most important directions of research. The citations generally refer to papers published in regular journals.The following topics were discussed: general aspects, chemical methods and reagents, spectrophotometry, speciation studies, atomic spectrometry, electrochemical methods, chemo-and biosensors, chromatography and related techniques.Short reviews on the history and present status of analytical chemistry have been published elsewhere 1 ' 2 and this review is intended to present the more detailed overview of the recent fields of interest, based on some selected 1203 1204 HULANICKI AND WITKIEWICZ publications from the nineties. Such selection is obviously to some extent arbitrary and this is mainly based on information sent by colleagues from various centres. It seemed, however, necessary to indicate where appropriate, the roots and earlier achievements. General aspectsGeneral methodical studies were connected with the criteria of homogeneity of chemical composition of standard substances 3 ' 4 which were later formulated by Malissa 5 and Danzer 6 . The linear regression model has been proposed for the study of homogeneity of solids 7 . As reference substances were proposed large, particularly pure, crystals 8 . Recently standards for electron spin resonance have been developed 9 " 11 . The concept of generalised matrix effects was proposed and developed 12 . A particular case was connected with the interferences in flame emission spectrometry 13 . The problem of interferences in various atomic spectrometric techniques was discussed in detail in a series of papers proposing a new method of interference elimination by standard addition and successive dilutions 14 " 17 . The generalised standard addition method and calibration procedures were proposed for a two-component potentiometric titration 18 . The same author also developed chemometric procedures for other systems 19 " 22 .The computer methodology was suggested for the study of analytical processes of high complexity. This was possible on the basis of a generalised electron balance for redox systems 23 ' 25 principally in thermodynamic systems, but also the procedure for kinetic systems has been proposed 26 . The method of potentiometric titration in acid-base systems in concentrated solutions made possible evaluation of equilibrium constants and species concentrations 27 ' 28 . A new criterion of reliability of thermodynamic data of analytical utility has been proposed on the basis of linear dependence of logarithm of the constant, activity coefficient and relative error 29 ' 30 . Modelling and optimisation of non-linear calibration procedures were also proposed 31 * 32 . Downloaded by [The University of British Columbia] at 23:51 18 November 2014 ANALYTICAL CHEMISTRY IN POLAND 1205Aspects of standard reference materials and interlaboratory comparisons were discussed i...

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Reliability of synthetic powder standards for atomic emission spectrometry

Cited by 2 publications

References 3 publications

On the Possibility of Removal of Non-Structural Iron from Kaolinite-Group Minerals

On the Possibility of Removal of Non-Structural Iron from Kaolinite-Group Minerals

Analytical Chemistry in Poland

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