ASTM_D_1292_-_15.pdf

Designation:D129215Standard Test Method forOdor in Water1This standard is issued under the fixed designation D1292;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method2covers the determination of the odor(that is,the property that affects the sense of smell)of water.Asuggested system for classifying odors is given as Annex A1.The test method is applicable to the determination of odorintensity in terms of odor intensity index or threshold odornumber.1.2 Effluents may carry a myriad of compounds,difficult tomeasure individually,which contribute to odor problems.Combinations of compounds can cause an odor intensity ordevelop a characteristic that cannot be anticipated from odorsof the individual substances.1.3 Because of the variation in human sensitivity,highprecision in determining odor intensity is not possible.Therewill not always be agreement on odor characteristics by varioustesters.Odor analysis provides the tool to measure variation inodor intensity at a given sampling point.The degree ofvariation may indicate the magnitude or importance of an odorproblem.Determining the cause of the variation or the sourceof the objectionable characteristic may define the odor problembetter than analysis for individual compounds.1.4 The values stated in SI or inch-pound units are to beregarded as the standard.The values given in parentheses arefor information only.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see the warning statement under 10.1.2.Referenced Documents2.1 ASTM Standards:3D1066 Practice for Sampling SteamD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2777 Practice for Determination of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed Conduits3.Terminology3.1 Definitions:3.1.1 The terms odor-intensity index and odor thresholdnumber in this standard are defined in accordance withTerminology D1129 as follows:3.1.2 odor-intensity index,nthe number of times theconcentration of the original sample is halved by addition ofodor-free water to obtain the least definitely perceptible odor.3.1.3 odor threshold number,nthe greatest dilution of thesample with odor-free water to yield the least definitelyperceptible odor.3.2 For definitions of other terms used in this test method,refer to Terminology D1129.4.Summary of Test Method4.1 A sample of water is diluted with odor-free water untila dilution is obtained that has the least definitely perceptibleodor.The test is made by two or more testers.One makesdilutions and the others determine odor intensity.Samples aretested in generally increasing concentration of odorant,al-though not in consecutive sequence of dilutions,until the odoris perceived.The persons making the test select the odoroussample from among three flasks,two of which contain odor-free water.Odor is measured without regard to the presence ofsuspended matter or immiscible substances in the sample.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.05 on Inorganic Constituentsin Water.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1953.Last previous edition approved in 2010 as D1292 10.DOI:10.1520/D1292-15.2This test method is based on a procedure proposed by the Dow Chemical Co.in a private communication.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Cognizance is taken of the fact that there is no absolute odorvalue and that the test is to be used for comparison only.Thetest is carried out at 40C.5.Significance and Use5.1 The odor of water is a subjective property which isrecognized as having a significant effect on its quality.This testis intended to provide a reproducible test method for determin-ing the intensity of odor in waters for comparative or controlpurposes.5.2 The test may be useful in checking the quality of raw ortreated waters,determining the effectiveness of treatmentprocedures,or in tracing sources of contamination or leaks inindustrial processes.5.3 The results of the test are very dependent upon theobservers,since the sensitivity of individuals to odor is highlyvariable a