Determination of Inorganic Mononuclear Aluminum by Selected Chelation Using Crown Ethers

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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‐, SO2‐4, 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 × 10−6 mol L−1 in the 0.8 to 10 × 10−6 mol Al L−1 concentration range.
Funding Information
  • U.S. Department of Energy (DE‐AS05‐83ER6017a)