Contributions to the basic problems of complexometry-XXIV Determination of aluminium in the presence of very large amounts of manganese.
A simple complexometric determination of aluminium in the presence of a large amount of manganese has been developed. For such determinations only triethylenetetraminehexa-acetic acid (TTHA) can be used. In slightly acidic medium TTHA forms with aluminium a binuclear complex Al(2)L. The complex is formed almost immediately at room temperature. The excess of TTHA is backtitrated with copper sulphate at pH about 5.3, with Glycinecresol Red as indicator. Reliable results were obtained for Mn:Al ratios up to at least 20. The sum of Al + Fe can be determined by the same method. Very large amounts of calcium and magnesium do not interfere.
Pribil
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Analytical Laboratory, Polarographic Institute of J. Heyrovský, Czechoslovak Academy of Sciences, Prague 1, Jilská 16, Czechoslovakia.
Veselý
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