ケイ酸のフローインジェクション分析法

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Flow injection analysis of silicic acid. Yukio HIRAI, Takushi YOKOYAMA, Norimasa YOZA, Toshikazu TARUTANI and Shigeru OHASHI (Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka-shi, Fukuoka) Flow injection analysis was applied to the spectro-photometric determination of silicic acid. A sample solution (80 μl) was introduced into a carrier stream of water via a loop-valve sample injector. The carrier stream met a molybdenum reagent stream {0.05 M Mo (VI), 0.135 M H_2SO_4}, and flowed together into a reaction tubing (PTFE, 0.5 mm i.d., 5 m). To complete chemical reaction the reaction tubing was heated at 50 ℃ in a silicone oil-bath. Residence time of the sample in the reaction tubing was about 1 min. The absorbance of heteropoly complex was monitored at 400 nm by a spectrophotometer with a flow-through cell (8 mm light path, 8 μl volume). The standard sample could be measured in a working range of 2 ppm to 100 ppm (SiO_2) at a sampling rate of 60 samples h-1. Detection limit (S / N = 2) was 0.3 ppm (SiO_2). The precisions (C. V.) were 1.7 %, 0.2 % and 0.07 % for monosilicic acid of 2 ppm, 20 ppm and 100 ppm (SiO_2), respectively. (Received Jan. 16, 1981)
社団法人日本分析化学会の論文
1981-05-05