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- W1974823204 abstract "This work describes a new approach for construction of gaseous diffusion/permeation module in a configuration based on the perfect fitting between two plaques of acrylic. It was employed to determine bicarbonate ions exploiting the discoloration of a 0.01% (m/v) phenolphthalein solution in medium of 1.0 x 10-5 mol L-1 NaOH (pH 9.0). The variation in the indicator color was monitored at 552 nm. The analytical curve showed a working range between 25.0 and 150.0 mg L-1 in NaHCO3. Consecutive injections (n=10) of a standard 5.0 mg L-1 NaHCO3 solutions exhibited less than 1.0% of relative standard deviation. The correlation coefficient of analytical curve was 0.9996 and the limit of detection (3 x noise/slope) is 4.41 mg L-1 in NaHCO3. The proposed method is rapid (50 sample/hour) and results were in good agreement with the ones obtained by classical titrimetry." @default.
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- W1974823204 date "2006-10-01" @default.
- W1974823204 modified "2023-09-23" @default.
- W1974823204 title "A new approach to construct diffusion/permeation cell for use in flow systems: application in the spectrophotometric determination of bicarbonate ions" @default.
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- W1974823204 doi "https://doi.org/10.1590/s0103-50532006000500023" @default.
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