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首页> 外文期刊>Journal of the Brazilian Chemical Society >A new approach to construct diffusion/permeation cell for use in flow systems. Application in the spectrophotometric determination of bicarbonate ions
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A new approach to construct diffusion/permeation cell for use in flow systems. Application in the spectrophotometric determination of bicarbonate ions

机译：构造用于流动系统的扩散/渗透池的新方法。在分光光度法测定碳酸氢根离子中的应用

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摘要

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.
机译：这项工作描述了一种基于两种丙烯酸树脂板之间完美配合的构造气体扩散/渗透模块的新方法。它用于在1.0 x 10（-5）mol L-1 NaOH（pH 9.0）介质中0.01％（m / v）酚酞溶液脱色的方法确定碳酸氢根离子。在552 nm处监测指示剂颜色的变化。分析曲线显示，NaHCO3中的工作范围为25.0至150.0 mg L-1。连续注射（n = 10）的标准5.0 mg L-1 NaHCO3溶液显示不到相对标准偏差的1.0％。分析曲线的相关系数为0.9996，NaHCO3中的检出限（3 x噪声/斜率）为4.41 mg L-1。所提出的方法快速（每小时50个样品），结果与经典滴定法得到的结果吻合良好。

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