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Determination of free AI3+ in soil solutions by capillary electrophoresis

Title data

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

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7181
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Oct 2015 07:29
Last Modified: 22 Oct 2015 07:29
URI: https://eref.uni-bayreuth.de/id/eprint/20696