共沈濃縮-細管式等速電気泳動法による海水中のフッ化物イオンの定量

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New determination procedure of fluoride ion in sea water was developed with a capillary type isotachophoresis after coprecipitation enrichment by magnesium hydroxide. Using a capillary tube with 200 mm in length and 0.5 mm in inner diameter connected a PTFE tube with 80 mm in length and 1.0 mm in inner diameter, optimum electrolyte system was studied for the determination of fluoride ion. Fluoride ion could be determined successfully using the leading electrolyte containing 0.01 M histidine hydrochoride, 0.1 % Triton X-100 and the terminating electrolyte containing 0.01 M hexanoic acid. Effects of amount of sodium hydroxide solution for coprecipitating fluoride ion and of concentration of sodium hydroxide solution for washing precipitate on the recovery of fluoride ion were examined. As a result, a solution of 1.5 ml of 1 M sodium hydroxide and 10^<-3> M sodium hydroxide solution were respectively found to be optimum for 50 ml of sample. One and a half milliliters of 1 M sodium hydroxide solution was added to 50 ml of artificial sea water sample containing fluoride ion to enrich the ion with magnesium hydroxide. To prevent the interferences caused by anions of high concentration, centrifuged precipitate was washed with 10^<-3> M sodium hydroxide solution and dissolved by adding 1.3 g of Dowex 50 W X8 ion exchange resin. The total volume was made to 5.0 ml with distilled water after nitration. A 50μl aliquot of the above solution was injected into the isotachophoresis apparatus. The linear working curve was obtained. The proposed method was applied to the determination of fluoride ion in the coastal sea water samples in Osaka Bay collected in April, 1984. The result obtained by the working curve method agreed closely with that obtained by the standard addition method.
社団法人日本分析化学会の論文
1985-04-05

共沈濃縮-細管式等速電気泳動法による海水中のフッ化物イオンの定量

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