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A modified method for the determination of quickly reacting aluminium
Author(s) -
CLARKE N.,
GUAN X.,
GOBRAN G. R.
Publication year - 1997
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.1997.tb00221.x
Subject(s) - aluminium , reagent , chemistry , volume (thermodynamics) , fractionation , range (aeronautics) , analytical chemistry (journal) , chromatography , materials science , thermodynamics , organic chemistry , composite material , physics
Summary Calculation of [Al 3+ ] is necessary to understand geochemical processes involving aluminium. Quickly reacting aluminium is a quantity from which [Al 3+ ] can be calculated. We have modified the method used to determine quickly reacting aluminium in soil leachates. The modifications consist of changing the reaction pH from 5·0 to 4·5 and increasing the reagent concentration from 4 to 12 mmol 1 −1 . The range of concentrations for which Beer's law applies has been increased up to 40 mg Al l −1 using a 20 μl injection volume. The sample throughput is 69–88 injections per hour, depending on concentration. A slight improvement in the buffering capacity has been obtained. The fractionation obtained is similar to that of the original method, except that a clearer separation is obtained for the complex AlHPO 4 + , enabling easier calculation of [Al 3+ ].