We proposed a simple flow-injection spectrophotometric procedure for the determination of yttrium using Arsenazo III and optimized various conditions (pH for color formation and sample, buffer systems, Arsenazo III concentration, injection volume, flow-rate, and mixing coils). The calibration was linear at least up to 1 mgY/L, with a detection limit (3r) of 0.02 mgY/L, RSD of 0.8% (n ‫ס‬ 11 at 0.40 mgY/L). A throughput of 60 injections h‫1מ‬ can be achieved. The procedure was applied to ore leachates of reference materials and samples.

This work presents the use of a 96-well plate as headspaces for the determination of ascorbic acid in samples loaded in the 96-well. Ascorbic acid in the sample is oxidized...

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