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ODOR Method 140.1 (Threshold Odor, Consistent Series) STORET NO. 60°C: 00086 Room Temp: 00085 1 Scope and ApphcatIOn 11 This method IS apphcable to the determmatIOn of threshold odor of dnnkmg, surface, and sahne waters, domestIc and mdustnal wastes 12 HIghly odorous samples are reduced m concentratIOn proportIOnately before bemg tested Thus, the method IS apphcable to samples rangmg from nearly odorless natural waters to mdustnal wastes WIth threshold odor numbers m the thousands 2 SummaryofMethod(l) 3 4 5 21 The sample of water IS diluted WIth odor-free water until a dilutIOn that IS of the least defimtely perceptIble odor to each tester IS found The resultmg ratio by WhICh the samplehasbeendilutedIScalledthe"thresholdodornumber"(T0 N) 22 People vary wIdely as to odor sensItIvIty, and even the same person WIll not be consIstent m the concentratIOns they can detect from day to day Therefore, panels of not less than five persons, and preferably 10 or more, are recommended to overcome the vanabIhty of usmg one observer (2) As an absolute mmimum, two persons are necessary One to make the sample dilutIons and one to determme the threshold odor Sample Handhng and PreservatIOn 3 1 3 2 Water samples must be collected m glass bottles WIth glass or Teflon-hned closures PlastIC contamers are not rehable for odor samples and must not be used Odor tests should be completed as soon as pOSSIble after collectIOn of the sample If storage IS necessary, collect at least 1000 ml of sample m a bottle filled to the top Refngerate, makmg sure no extraneous odors can be drawn mto the sample as the water cools Interferences 4 1 Most tap waters and some waste waters are chlonnated It IS often deSIrable to determme the odor of the chlonnated sample as well as of the same sample after removal of chlonne DechlonnatIon IS achIeved usmg sodIUm thIOsulfate m exact stOichIOmetnc quantity 4 l I l t IS Important to check a blank to WhICh a SImilar amount of dechlonnatmg agent has been added to determme If any odor has been Imparted Such odor usually dIsappears upon standmg Ifexcess reagent has not been added Apparatus 5 1 Odor-free glassware Glassware must be freshly cleaned shortly before use, WIth non- odorous soap and aCId cleamng solutIOn followed by nnsmg WIth odor-free water (61) Issued 1971 140 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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