水酸化鉄(III)共沈浮選/限外濾過による水中のフミン酸の分離濃縮(<特集>環境汚染物質の分析化学)

概要

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To 1 liter of water containing humic acid was added 1ml of iron (III) solution (10mg Fe/ml) and the pH was adjusted to 7 to collect the humic acid on iron (III) hydroxide precipitates. Three ml of 70% ethanol solution of sodium oleate (0.2mg/ml) and sodium dodecyl sulfate (0.6mg/ml) was added to render the precipitate surfaces hydrophobic. The precipitates were rapidly floated with numerous nitrogen bubbles (0.1〜0.5mm in diam.), collected and then dissolved in 10ml of 2M hydrochloric acid. Humic acid was filtered off on an ultrafilter (molecular weight cut-off, 10000) and ultrasonically dissolved in 10ml of 0.1M potassium hydroxide solution for the spectrophotometric determination. Within 1 h of the entire procedure, 0.01〜5mg/l of humic acid was recovered at more than 92%.
1987-03-05