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閔丙龍,鄭在灌 成均館大學校 科學技術硏究所 1992 論文集 Vol.42 No.2
The arsenic(v) removal from aqueous solutions was undertaken with anion exchange resins using an intergral bed reactor ranging from 2.0㎝ to 8.0㎝ in height. The concentration in the feed solutions varied from 4.04mg As^5+/l to 20.37mg As^5+/l. Generally, the liquid-solid type reaction is complicated by the presence of resistance as a result of film diffusion across the external solid surface. Therefore, this diffusion influence should be minimized to establish the optimal operating conditions as much as possible. Under the condition of flow rate of 418㎤, the diffusional resistance was minimized and the initial rate of arsenic(v) removal was maximized. The effect of pH on the removal of arsenic(v) was investigated and it was found that maximum adsorption occurred above pH 7.0. Therefore, the pH was adjusted at 7.3 in subsequent experiments. From batch studies an empirical Freundlich isotherm could be expressed as follows : q_e = 12.3C_e^(1/1.01) The reaction kinetics studied in this experiment may be summarized as follows : r = 0.087 C_a^1.3 - 0.320 q_a^0.21
김기성,강통삼,민병용,임상동,박동준 한국낙농학회 1990 韓國酪農學會誌 Vol.12 No.3
계절의 변화 및 열처리방법의 차이에 따른 국산시유의 품질조사를 위해서 1989 년 1 월부터 12 월까지 매주 6가지 시유제품을 수거하여 분석한 결과는 다음과 같다. 1. 국산시유의 연평균 비중, pH 및 적정산도는 각각 1.0324, 6.66 및 0.167%였다. 2. 여름 제품의 pH가 다른 계절에 비하여 약간 높았으나 비중과 적정산도는 연중 큰 변화가 없었다. 3. 각 제품사이에 주목할 만한 차이는 나타나지 않았다. Studies were conducted to investigate the quality changes of market milk products by the season and the process of heat treatment. Market milks from 6 dairy processing companies were tested for their physicochemical properties every week from Jan. to Dec. in 1989. The results obtained were summarized as follows; 1. Average values of specific gravity, pH and titratable acidity of market milk products were 1.0324, 6.66 and 0.167%, respectively. 2. Specific gravity and titratable acidity of market milk products had little differences throughout the year, whereas pH of market milk products in summer showed a little higher value than that of other seasons. 3. Differences of physicochemical properties among 6 market milk products were not detected.