Fluorimetric determination of carbohydrates in sea water

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Abstract

Fluorimetric determinations of pentose with anthrone, and of hexose with 5-hydroxy-1-tetralone, are applied to the analysis of sea water. Adsorption on activated carbon and ion-exchange membrane electrodialysis were studied for preliminary separations. Activated carbon was suitable for the separation and concentration of hexose, but not pentose. Electrodialysis allowed complete desalination without loss of carbohydrates; pentose and hexose in sea water could be determined after evaporation under reduced pressure. Several sea-water samples were analysed, and the pentose content was estimated to be 225–288 μg 1-1 (as furfural), but the hexose content varied from 250 to 1670 μg 1-1 (as glucose) owing to contamination by sewage.

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