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Determination of Inorganic Mononuclear Aluminum by Selected Chelation Using Crown Ethers¹

ABSTRACT

This study was conducted to determine whether cation-selective crown ethers could be utilized to measure inorganic mononuclear Al³⁺ in solutions containing Al-complexing ligands. The dibenzo-18-crown-6 ether was found to selectively chelate inorganic mononuclear Al³⁺ in the presence of common soil cations (Na, K, Ca, Mg, Fe, and Si). Aluminum previously complexed with di-NaEDTA, oxalic, and citric acid was not chelated by the crown ether. The presence of high concentrations of F^-, SO^2-₄, and NO^-₃ in the sample solutions did not influence the determination of inorganic mononuclear Al³⁺. Determination of inorganic mononuclear Al³⁺ was reproducible to within ±0.17 x 10^–6 mol L^–1 in the 0.8 to 10 x 10^–6 mol Al L^–1 concentration range.

¹ Contribution from the Dep. of Agronomy, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061. Work was funded in part by the U.S. Dep. of Energy under contract number DE-AS05-83ER6017a.

² Postdoctoral Research Associate and Professor, respectively.

Received for publication June 6, 1985.