Standard Methods for the Examination of Water and Wastewater, Volume 2
American Public Health Association., 1915 - Factory and trade waste
"The signature undertaking of the Twenty-Second Edition was clarifying the QC practices necessary to perform the methods in this manual. Section in Part 1000 were rewritten, and detailed QC sections were added in Parts 2000 through 7000. These changes are a direct and necessary result of the mandate to stay abreast of regulatory requirements and a policy intended to clarify the QC steps considered to be an integral part of each test method. Additional QC steps were added to almost half of the sections."--Pref. p. iv.
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added addition agar alkalinity allow ammonia amount bacteria boiling bottle broth calcium carbonate carbonic acid cent chloride coli colonies color comparing concentrated containing contents cool culture described determination dextrose dilute dish dissolved distilled water drops evaporation examination expressed filter filtrate five flask forms gelatin given gives glass grams growth hardness Health Assn heat hydrate incubation indicator iron isolated Jour lactose bile lead less liquid liter liver broth magnesium medium method milk million minutes mixed necessary Nessler nitrate nitrogen observed obtained organic organic matter oxygen period permanganate plate portion positive potassium practice precipitate preferably prepared present procedure production quantities reaction record removed Report residue salt sample sewage soap sodium solution species stained stand standard sterilized sulphuric acid surface TABLE temperature tion tube usual Variety various volume wash weigh