对生活中几种水样的大肠菌群检测和分析
摘 要
本实验对生活中的几个水样,包括自来水、热干面、冰红茶、南湖水,进行了细菌总数和大肠菌群数的测定。对大肠菌群的检测利用了多管发酵法,通过记录阳性管数并查最大可能数表(MPN)查出不同水样中大肠菌群的可能含量。结果显示:热干面细菌总数、大肠菌群数超标;南湖水细菌总数、大肠菌群数超标,属于污染状态,不宜直接饮用;自来水和冰红茶因操作失误未得到可靠结果。对类大肠杆菌的分析表明,南湖水、校所售的热干面中含有类大肠杆菌。
关键词:水样、大肠菌群、细菌总数、粪大肠杆菌。
Abstract
In this study, several water samples which are universal in our life including tap water, dry noodles, iced tea, water of Nanhu Lake, the determination of total bacteria and coli form counts. Coliform detection using multiple tube fermentation method, by recording the number of positive tubes and check the maximum possible number of tables (MPN) to find out the possible content of the different water samples coli forms. The results showed that: dry noodles bacterial count, coli form counts exceeded; South Lake water total bacterial counts, coli form counts exceeded the polluter of state, should not be directly consumed; water and iced tea did not get reliable results due to operational errors. The analysis shows that the class of E. coli, containing the Nanhu water, dry noodles sold by the school class of E. coli.
Keywords: water samples, coliform bacteria, total bacteria, fecal coliform
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