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Automated Aluminum Analysis with the Aluminon Method¹

ABSTRACT

An automated method of aluminum analysis by the aluminon (ammonium salt of aurin tricarboxylic acid) procedure is described. The method employs ascorbic acid for removal of Fe(III) interference and eliminates, with proper sample pretreatment, the need for a protective colloid. The calibration curve has a correlation coefficient > 0.99 and a standard deviation around the regression line of ± 0.07 absorbance units up to 1.2-ppm Al in solution. Standard autoanalyzer components are utilized in the system and computer interfacing is possible.

¹ Contribution from the Agron. Dep., Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.

² Research Assistant, Assistant Professor of Agronomy, and Research Technician, respectively.

Received for publication November 10, 1980. Accepted for publication January 31, 1981.