The number of E. coli colonies that emerge when a certain amount of sample is taken and cultured in a certain way. Generally, the presence of E. coli in water or food indicates contamination by human or livestock waste, or the possibility of such contamination. The level of contamination is estimated by measuring the number of E. coli bacteria through a quantitative test. The discharge standards in the Water Pollution Control Law stipulate the permissible limit for average daily contamination at 3,000 bacteria/ cm3 . Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
一定量の試料をとって,一定の方法で培養したときに現れてくる大腸菌群落の数。一般に水や食品中の大腸菌の存在は,人畜の屎尿による汚染か,またはその可能性を意味する。定量試験によって大腸菌群数を測定して汚染の程度を推定する。水質汚濁防止法における排出基準では,1日の平均的な汚染状態についての許容限度を 3000個 /cm3 と定めている。
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