Spectrophotometric determination of silicic acid by flow injection analysis.

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概要

• 論文の詳細を見る

• Flow injection analysis (FIA) was developed for the spectrophotometric determination of silicic acid based on the formation of a yellow molybdosilicic acid (yellow method) and a heteropoly blue complex (blue method). In the yellow method, silicic acid in the concentration range of 2 to 100 ppm (SiO<SUB>2</SUB>) could be determined at a sampling rate of 60 samples/h. The FIA system was modified to determine silicic acid in the presence of orthophosphate. Oxalic acid was used for the decomposition of molybdophosphoric acid. The modified system was employed for the rapid and selective determination of silicic acid in well and river waters. In the blue method, ascorbic acid was used to reduce the yellow molybdosilicic acid to a heteropoly blue complex. Silicic acid in the concentration range of 0.02 to 1.0 ppm (SiO<SUB>2</SUB>) could be determined at a sampling rate of 40 samples/h. The FIA system was also modified to determine silicic acid in the presence of orthophosphate. The reducing agent was introduced after molybdophosphoric acid had been completely decomposed by adding oxalic acid. The modified system was employed for the determination of silicic acid in sea water.

• 公益社団法人 日本化学会の論文

著者

• Yokoyama Takushi

  Department Of Chemistry Faculty Of Science

• Yoza Norimasa

  Department Of Chemistry Faculty Of Science Kyushu University

• Ohashi Shigeru

  Department of Chemistry Faculty of Science Kanazawa University

• Tarutani Toshikazu

  Department of Chemistry, Faculty of Science, Kyushu University

• Hirai Yukio

  Department of Chemistry, Faculty of Science, Kyushu University 33

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