2009
Sitko, R.; Zawisza, B.; Krzykawski, T.; Malicka, E.
Determination of chemical composition of siderite in concretions by wavelength-dispersive X-ray spectrometry following selective dissolution Journal Article
In: Talanta, vol. 77, no. 3, pp. 1105-1110, 2009, ISSN: 00399140, (7).
@article{2-s2.0-57049086940,
title = {Determination of chemical composition of siderite in concretions by wavelength-dispersive X-ray spectrometry following selective dissolution},
author = { R. Sitko and B. Zawisza and T. Krzykawski and E. Malicka},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-57049086940&doi=10.1016%2fj.talanta.2008.08.019&partnerID=40&md5=9a1974c2a8eb864ff516234f51c84e2d},
doi = {10.1016/j.talanta.2008.08.019},
issn = {00399140},
year = {2009},
date = {2009-01-01},
journal = {Talanta},
volume = {77},
number = {3},
pages = {1105-1110},
publisher = {Elsevier},
abstract = {Determination of chemical composition of siderite (Fe; Me)CO3 (where Me = Mg; Ca; Mn) present in siderite concretion is developed. An accurate and precise determination of Mg, Ca, Mn and Fe in siderite required complete separation of this mineral from other materials, e.g. calcite, quartz. For this purpose, selective dissolution in acetic acid (HAc) was applied. HAc concentration from 0.1 to 1 mol L-1 and extraction time from 0.5 to 8 h were investigated. In each step of investigation of selective dissolution, the X-ray diffraction measurements (XRD) of the residues was performed and also calcium (complexometric titration) and iron (XRF) in solution were determined. HAc of concentration 0.25 mol L-1 and extraction time of 2 h was adopted for siderite separation because in these conditions the siderite was not dissolved and, simultaneously, calcite was completely dissolved. In the next step, the nondissolved sample was digested in hydrochloric acid. The solution of the separated siderite was pipetted onto membrane filter and Mg, Ca, Mn and Fe were determined by wavelength-dispersive X-ray fluorescence (WDXRF) spectrometry. The calibration was performed using 11 certified reference materials of iron ores. Matrix effects were corrected using empirical coefficient model for intermediate-thickness samples. © 2008 Elsevier B.V. All rights reserved.},
note = {7},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Determination of chemical composition of siderite (Fe; Me)CO3 (where Me = Mg; Ca; Mn) present in siderite concretion is developed. An accurate and precise determination of Mg, Ca, Mn and Fe in siderite required complete separation of this mineral from other materials, e.g. calcite, quartz. For this purpose, selective dissolution in acetic acid (HAc) was applied. HAc concentration from 0.1 to 1 mol L-1 and extraction time from 0.5 to 8 h were investigated. In each step of investigation of selective dissolution, the X-ray diffraction measurements (XRD) of the residues was performed and also calcium (complexometric titration) and iron (XRF) in solution were determined. HAc of concentration 0.25 mol L-1 and extraction time of 2 h was adopted for siderite separation because in these conditions the siderite was not dissolved and, simultaneously, calcite was completely dissolved. In the next step, the nondissolved sample was digested in hydrochloric acid. The solution of the separated siderite was pipetted onto membrane filter and Mg, Ca, Mn and Fe were determined by wavelength-dispersive X-ray fluorescence (WDXRF) spectrometry. The calibration was performed using 11 certified reference materials of iron ores. Matrix effects were corrected using empirical coefficient model for intermediate-thickness samples. © 2008 Elsevier B.V. All rights reserved.
2005
Sitko, R.; Zawisza, B.; Czaja, M. B.
Fundamental parameters method for determination of rare earth elements in apatites by wavelength-dispersive X-ray fluorescence spectrometry Journal Article
In: Journal of Analytical Atomic Spectrometry, vol. 20, no. 8, pp. 741-745, 2005, ISSN: 02679477, (22).
@article{2-s2.0-23644443651,
title = {Fundamental parameters method for determination of rare earth elements in apatites by wavelength-dispersive X-ray fluorescence spectrometry},
author = { R. Sitko and B. Zawisza and M.B. Czaja},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-23644443651&doi=10.1039%2fb502994e&partnerID=40&md5=8bb03e0118fbba8b35f6c8920e0b876b},
doi = {10.1039/b502994e},
issn = {02679477},
year = {2005},
date = {2005-01-01},
journal = {Journal of Analytical Atomic Spectrometry},
volume = {20},
number = {8},
pages = {741-745},
abstract = {The determination of rare earth elements (REE) in small samples of various apatites (hydroxylapatites; carbonate-hydroxyl-fluorapatites; fluor-carbonate-hydroxylapatites; fluorapatites; fluor-meta-apatites) by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) is presented. A small amount of the analyzed material is digested in aqua regia and then the solution obtained is pipetted onto a membrane filter. Absorption effects of the matrix elements, e.g. Ca, P, and the membrane filter are determined using an emission-transmission method. Analysis is performed using a lanthanum standard sample and theoretical calculation of the radiation intensity of REE. Therefore, standard samples for each REE are not required. Overlap of the REE peaks is also corrected theoretically using the spectrometer resolution and an approximation of the peak shape by a Gaussian function. © The Royal Society of Chemistry 2005.},
note = {22},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The determination of rare earth elements (REE) in small samples of various apatites (hydroxylapatites; carbonate-hydroxyl-fluorapatites; fluor-carbonate-hydroxylapatites; fluorapatites; fluor-meta-apatites) by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF) is presented. A small amount of the analyzed material is digested in aqua regia and then the solution obtained is pipetted onto a membrane filter. Absorption effects of the matrix elements, e.g. Ca, P, and the membrane filter are determined using an emission-transmission method. Analysis is performed using a lanthanum standard sample and theoretical calculation of the radiation intensity of REE. Therefore, standard samples for each REE are not required. Overlap of the REE peaks is also corrected theoretically using the spectrometer resolution and an approximation of the peak shape by a Gaussian function. © The Royal Society of Chemistry 2005.