報告書番号

V13014

タイトル（和文）

脱硫石膏フッ素溶出量の簡易迅速定量法の開発(その1）－石膏溶出操作の迅速化と分析の簡易化検討－

タイトル（英文）

Development of simple rapid determination method of fluorine elution from desulfurization gypsum (Part1) -Examination of speed-up of gypsum elution operation and simplification of analysis-

概要 （図表や脚注は「報告書全文」に掲載しております）

脱硫石膏のフッ素溶出量を簡易迅速に評価する手法を整備するため，脱硫石膏溶出特性を調査するとともに溶出時間（現行6時間）の短縮について検討した。さらに定量法に関して煩雑な前処理が不要の吸光光度法の適用性および精度を評価した。結果（1）超音波溶出と湿式ボールミル粉砕について6時間振とうと比較した結果，湿式ボールミル粉砕（10分）で水平振とうと同等の溶出が得られたが，両処理法ともに粒径の小さい石膏では過小評価になることが確認された。（2）簡易な2種類の吸光光度法について，イオンクロマトグラフ法との間で精度・適用性を評価した。その結果，アセチルアセトン添加のランタンアリザリンコンプレキソン吸光光度法は，蒸留操作なしで定量可能であり，その検出限界は0.08mg/Lと推計された。

概要 （英文）

The method of measuring fluorine that eluted from the desulfurization gypsum promptly and easily is developed in this report. The kinds of the materials that eluted from the desulfurization gypsum and the amount are investigated, and the method of shortening time necessary for the elution process is examined. And the practicality and the accuracy of the measurement methods of fluorine by the absorptiometry that omitted a complex pretreating process are investigated. The following are obtained as a result.
(1) The supersonic wave processing and wet ball mill processing are done in the elution test of gypsum, and the result is compared with that of JLT-46. The concentration of the effluent by the wet process ball milling processing is the highest, and the value is about 89% of JLT-46. It is clarified that the amount of the elution tended to decrease by the particle size of gypsum small as for the both processing. (2) Two kinds of simple absorptiometry are selected as a method of the rapid analysis, and it make comparative study of accuracy and applicability between the ion chromatography method. The lanthanum-alizarin complexone absorptiometry that adds acetylacetone is applicable without the pretreatment (detection limit 0.08mg/L). On the other hand, the SPADNS method that United States EPA had attested is not able to be applied by the obstruction of sulfate.

報告者

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