Hygienical Studies on Surface Water in the Agricultural Zones:Report 2. Studies on the Contamination of Surface Water

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概要

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• The author made hygienical and bacteriological studies on superficial water (3 places of river water, 1 place of swamp water and 1 place of rain water) in the agricultural zones.<BR>1. As for river water, coli bacilli and enterococci were proved even in the upper streams of the rivers in the mountains. However, considerable difference in number of bacteria, coli bacilli and enterococci between the upper and lower streams was observed. Naturally, the water in the lower streams was much dirtier than that in the upper streams. By the same token, river water in the plain showed more dirtiness than that in the mountains after various examinations.<BR>2. The swamp water of the Inbanuma showed high degree of dirtiness. It was as dirty as river water in the plain, or even dirtier, although number of enterococci was smaller.<BR>3. Coli bacilli were proved in all the tested materials of the reserved rain water (in Toshima of Tokyo Metropolitan District) but the dirtiness was somewhat lighter than that in river water.<BR>4. Correlations between each examined values were stndied. Definite correlation between coli bacilli and enterococci was noted especially in river water of the upper steams, although the correlation in swamp water was different from that in river water. No constant correlation was observed between number of bacteria and coli bacilli or between number of Leiriaa nd enterococci.<BR>5. M.P.N. values on coli bacilli and enterococci were studied using fermentation tube methods, and comparison was done between 3 tube method (M.P.N. per 100 ml. of sample using 3 tubes) and 5 tube method (M.P.N. per 100 ml. of sample using 5 tubes) using swamp water. The ratio of the values obtained from these two methods revealed that values by 3 tube method were apt to be higher than those by 5 tube method. The same material which showed positive reaction on enterococci by 5 tube met hod, reacted negatively by 3 tube method. This result meant that the material with comparatively less dirtiness should have been examined by 5 tube method.

• 日本民族衛生学会の論文

著者

• 須田 正男

  東京医科歯科大学医学部農材厚生医学研究施設

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