重크롬酸칼륨과 鹽化바륨의 混酸溶液에 의한 微量 黃酸이온의 吸光光度定量 = Spectrophotometric Determination of Micro Amounts of Sulfate Ion by Using Potassium Dichromate - Barium Chloride in Mixed Acid Solution

국문 초록 (Abstract)

徵量의 黃酸이온을 보다 迅速正確하고 簡便하게 測定할 수 있는 定量法이 重크롬酸 칼륨과 鹽化바륨을 鹽酸-醋酸에 녹인 混酸溶液을 定量試樂으로 使用함으로선 確立되었다. 黃酸바륨의 溶解度以下에 該當하는 微量 黃酸이온의 測定을 위해서는, 沈沈澱反應에 影響을 미치는 共通이온의 添加量. pH, 溫度, 溶媒 그리고 反應時間 等을 詳細히 檢討하여 얻어진 最適條件을 定量에 利用함으로서 黃酸바륨 및 크롬酸염바륨의 溶解度가 크게 減少혀었다. 特히, 混酸溶液試藥은 化學量論的으로 計劃된 過量의 重크롬酸이온 을 一定量의 바륨이온이 含有된 混酸溶液에 添加함으로서 準備되었다. 本法에 의하면, 水溶液中의 0-50 ppm 黃酸이온이 定量的으로 測定可能하다.

다국어 초록 (Multilingual Abstract)

A more rapid, correct and simple method for the microdetermination of sulfate ions in natural water was established by using potassium dichromate - barium chloride in the mixed acid solution of hydrochloric acid and acetic acid.
To determine the sulfate ion of micro amounts corresponding to the one which is less than solubility of barium sulfate, the solubilities of barium sulfate and barium chromate were strongly suppressed by using the optimal conditions of addition amount of common ions, pH, temperature, solvents and reaction time which have influences on the precipitation reaction. Especially, the stoichiometrically designed excess amount of the dichromate ions was added to the mixed acid solution containing a fixed amount of barium ions for the preparation of the mixed acid solution reagent. By the proposed method, 0 to 50 ppm of sulfate ions in aqueous solution can be quantitatively determined.