International Standards for Drinking-water

acid solution agar ammonium hydroxide Apparatus autoclave bacteriological examination bottle broth buffer solution cell chloride coliform coliform group coliform organisms colonies colour cool count determined dilute to 100 Dissolve distilled water dithizone drinking-water examination of water eyepiece fermentation tubes filter flask fluoride g of potassium g of sodium glass Health hydrochloric acid hydroxide solution incubated indicator solution indicators of pollution Interference laboratory lactose litre litre of distilled litre with distilled method mg/l micrometer microscope ml of concentrated ml of distilled ml of sample ml with distilled MPN index Nessler tubes nitrogen number of organisms odour oxygen phosphate plankton potassium chromate potassium dichromate Precision and accuracy prepared present procedure reagent redistilled residue silver nitrate sodium citrate sodium hydroxide sodium thiosulfate solution contains standard solution sterilize stock solution stopper storage sulfate sulfuric acid temperature tion titration treatment turbidity volume volumetric standard units water and dilute water-supply