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Rapid, On-Line Preconcentration, Matrix Normalization, and Signal Enhancement for Flame Atomic Absorption via Tubular Donnan Dialysis

Volume 41, Number 7 (Oct. 1987) Page 1231-1235

Koropchak, John A.; Dabek-Zlotorzynska, Ewa


The application of tubular ion-exchange membranes for on-line use with flame atomic absorption (FAA) was investigated. Signal enhancement factors as high as 22 were observed within five minutes for a variety of cations. Enhancements improved with lower pH receiver solutions, increased tubing length, and increased temperature. Optimum receiver flow rates were a compromise between optima for independent Donnan dialysis or FAA experiments. Low anion interferences were observed for phosphate-to-calcium mole ratios up to 80.