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Spectrofluorimetric Determination of Submicrogram Silicate with Benzoin and Mannitol

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Abstract

A method for the determination of 5 ng - 10 μg (as Si) of silicate based on the formation of a fluorescent complex among silicate, benzoin and mannitol in a strongly alkaline formamide medium has been established. To reduce the blank value and to improve the reproducibility, sodium dithionite is added as a reducing agent; this prevents the oxidation of benzoin. The silicate in the solution can be determined over a very wide range by the same chemical procedures only by changing the sensitivity range of the spectrofluorimeter. The relative standard deviation of the method at a level of 0.5 μg Si is 2.7%. Phosphate and arsenate can be tolerated up to 4000-fold amounts.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152, Japan

    Eisaku Satoh, Kazuhisa Yamaya & Minoru Yoshida

Authors
  1. Eisaku Satoh
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  2. Kazuhisa Yamaya
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  3. Minoru Yoshida
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Satoh, E., Yamaya, K. & Yoshida, M. Spectrofluorimetric Determination of Submicrogram Silicate with Benzoin and Mannitol. ANAL. SCI. 3, 135–139 (1987). https://doi.org/10.2116/analsci.3.135

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  • DOI: https://doi.org/10.2116/analsci.3.135

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