1995, And we shall now describe reactants colorimetric to quantitatively bacteria pathogens in water.

摘要

The subject of the present invention is processes and colorimetric reagents which make it possible to quantitatively detect pathogenic bacteria in water. A colorimetric reagent according to the invention is an aqueous solution containing, per litre of solution, the following products: - sulphanilic acid between 0.1 and 1.5 g; - N-(1-naphthyl)ethylenediamine dihydrochloride between 0.1 and 1.5 g; - methylene blue between 0.001 and 0.15 g; - mercury(II) nitrate between 5 g and 20 g; - tartaric acid between 0.05 and 0.25 g; - acetic acid between 1 and 5 g. One application is the rapid determination of the order of magnitude to within a power of ten, of the quantity of pathogenic bacteria contained in the unit volume of a water sample.