ASTM_E_1075_-_85_1997.pdf

Designation:E 1075 85(Reapproved 1997)Standard Test Methods forOdor of Ethylene Glycol,Diethylene Glycol,TriethyleneGlycol,Propylene Glycol,and Dipropylene Glycol and Tasteof Propylene Glycol1This standard is issued under the fixed designation E 1075;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover procedures for observingodors of glycols and estimating their odor acceptability.Thesetest methods apply to ethylene,diethylene,triethylene,propy-lene,and dipropylene glycols.Amethod for observing the tasteand estimating the intensity of the taste of propylene glycol isalso included.1.2 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.2.Referenced Documents2.1 ASTM Standards:Manual:STP 758 Selection and Training of Sensory EvaluationPanels23.Significance and Use3.1 These test methods can be used to characterize the odorsof ethylene,diethylene,triethylene,propylene,and dipropyleneglycol and estimating the intensity of the odor.The productsare compared to previously established standards.The accept-ability of the product for a specific end use can be determinedwith this information.3.2 A procedure which can be used to characterize the tasteof propylene glycol and establish the intensity of this tasterelative to a previously established standard is delineated.Theacceptability of the product for a specific end use can bedetermined with this information.3.3 These tests may be used to qualify the suitability ofthese products for use in a customer-producer relationship.4.Panel4.1 A panel of at least five trained judges led by a qualifiedsupervisor or coordinator is recommended for these evalua-tions.4.2 The panel may be selected and trained in accordancewith the methods outlined in ASTM STP 758.Since discrimi-nation tests are involved,panel members must have a completeunderstanding of the nature of the judgments required,the testprocedures,and test controls required.During the trainingperiod panelists should examine both acceptable and unaccept-able products to become familiar with the range of acceptabil-ity.5.Reference Samples5.1 Reference samples of the products to be tested,havingodor and taste(propylene glycol only)characteristics satisfac-tory to the customer and producer,are required.5.2 The standards must be examined periodically to assuretheir continued quality and acceptability,and replaced whennecessary.6.Test Unit6.1 The tests described may be performed in a single panelsession on a single sample.7.Procedure AOdor Character by Filter Paper7.1 Apparatus:7.1.1 Rapid Qualitative Filter Paper,2.5 by 7.5-cm strips,odor free.NOTE1Perfumers blotters may replace filter paper,if desired.Theprimary consideration is that the paper be odor-free.7.1.2 Glass Containers,odor-free,with fitted closures.7.2 Sample PreparationEach panelist pours a few millili-tres of the sample on a piece of clean odor-free filter paper.7.3 Sample Evaluation:7.3.1 For characterization,panelists should observe the odorof the filter paper immediately.7.3.2 Panel members should record individual results asoutlined in 13.1.8.Procedure BOdor Character Intensity,Undiluted8.1 Apparatus:8.1.1 Glass Containers,odor-free 250 mL with fitted clo-sures.8.2 Sample PreparationPour 50 mL of the sample into aclean,odor-free 250-mL flask and cover with an appropriate1These test methods are under the jurisdiction of ASTM Committee E-18 onSensory Evaluation of Materials and Products and are the direct responsibility ofSubcommittee E18.06 on Food,Beverage,and Tobacco Evaluation.Current edition approved Sept.27,1985.Published November 1985.2Available from ASTM Headquarters,1916 Race St.,Phila.,PA 19103.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.closure(glass,aluminum,or stainless steel).Prepare thereference standard in the same manner.8.3 Sample EvaluationRemove closure from the standardand without agitating,take three short sniffs to evaluate.Repeat,if necessary.Swirl the standard three times(gently inorder not to incorporate air)and smell once more to detect anyadditional odor characteristics not observed initially.Repeatthis procedure for the sample.Before proceeding to the nextsample,replace closures on flasks and record characterizationas compared to standard as outlined in 13.1.9.Procedure COdor Character Intensity by Dilution9.1 Sample PreparationAdd 50 mL of sample to a250-mL flask containing 50 mL of odor-free water.Swirl tomix and cover with an appropriate closure(see 8.2).Prepare areference standard in the same ma