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金鍾冕,朴忠雄,田銀順,孔錫宗 全北大學校 附設 畜産開發硏究所 1987 畜産開發硏究報告 Vol.1 No.-
Concentration of dissolved vitamin B_12 in the water of Okjeong lake have been determined by microbiological assay methods on the 20th of August, 1983. Also the relations between the vitamin B_12 and other physical, chemical and biological environmental factors were investigated. Vitamin B_12 was assayed with Euglena gracilis Z strain. The results obtained in this investigation were as folows:1. Generally, the values of COD and Cl^- were higher than values reported in 1981. 2. The concentration of nutrient salts in the lake water was found to be at a higher level: above the general criterion in a eutrophic lake viz., phosphorous 0.175-0.225 ㎎/l. 3. Chlorophyll a contents in this lake were 1.1-8.7 ㎍/l. 4. The concentration of vitamin B_12 in the water fairly high: 1.25-6.0 ng. It is apparent that concentrations of the vitamin B_12 as well as nutrient salts were high in the water of Okjeong lake. It was found that Okjeung lake was in eutrophic.