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Determination of free AI3+ in soil solutions by capillary electrophoresis

Titelangaben

Göttlein, Axel:
Determination of free AI3+ in soil solutions by capillary electrophoresis.
In: European Journal of Soil Science. Bd. 49 (1998) Heft 1 . - S. 107-112.
ISSN 1351-0754
DOI: https://doi.org/10.1046/j.1365-2389.1998.00133.x

Abstract

Colorimetric and ion exchange methods are commonly used to distinguish and measure Al species in natural waters. Unfortunately they also include weakly complexed Al species in their 'reactive' or 'labile' Al fractions and thus are of limited value for the estimation of free Al3+.Capillary electrophoresis (CE) has the potential for direct measurement of Al3+, and its performance has been verified experimentally. The method also detected the stable and positively charged AlOx+ complex formed with oxalic acid. It was compared with a colorimetric and an ion exchange method by analysing artificial solutions containing low molecular weight organic acids as well as soil extracts and seepage waters and was found to be the only method closely matching the theoretically calculated values of free Al3+. In samples from the upper soil horizons of an acid forest soil less than 14 % of total Al was present as free Al3+, whereas the colorimetric method found more than 65 %, and the ion exchange method more than 80 % of total Al in a 'reactive' or 'labile' form. The latter methods thus would seriously overestimate Al toxicity, whereas using CE Al toxicity is likely to be only slightly underestimated.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER7181
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 22 Okt 2015 07:29
Letzte Änderung: 22 Okt 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/20696