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alkaline amine Ammonia Anal analytical reagent grade antimony trichloride aqueous B.D.H. Lovibond Nessleriser beaker benzene blank Bromo buffer solution calibrated carbon tetrachloride carotene cell Chem chemical chloride chloroform chromotropic acid Classification Quantitative test colorimetric Colour Grading colour produced compare the colour concentration Copper covers the range cyanide cylinder Determination Dichlorophene dilute disc covers Dissolve distilled water dulling screen effluents extraction filter Formaldehyde glass colour standards hydrochloric acid hydrogen lauryl pentachlorphenol layer left-hand compartment liquid litre Lovibond Comparator Disc Lovibond disc Lovibond permanent glass Lovibond White Light method Methyl methylene blue minutes north daylight permanent glass colour permanent glass standards pH value phenols pipette Potassium pyridine quantities reagent Reagents required right-hand compartment separating funnel shake sodium hydroxide soil solution reagent source of white Standard Lovibond Comparator standard source stopper sulphate sulphuric acid Technique test tube thiocyanate Tintometer Tintometer Ltd urine volume Wash White Light Equipment