Influence of physico‐chemical factors on the coliform bacteria in a closed‐lake water system

Abstract
This investigation is concerned with an examination of the coliform group of micro‐organisms responsible for causing pollution in drinking waters. Bacterial counts (MPN) were correlated with certain physical and chemical factors, viz. electrical conductivity, pH, temperature, Ca‐Mg hardness, inorganic nitrogen substances, inorganic sulphate and phosphate contents of the water. The coliform counts (MPN) varied with seasonal variations and changes in the properties of the water bodies. An inverse correlation of bacterial counts was noted with the dissolved inorganic nitrogenous compounds like ammonia, nitrite and nitrate. Similar observations were made when compared with dissolved salts of phosphate and sulphate.

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