1、Designation:D556095(Reapproved 2011)Standard Test Method forDetermination of Neutral Fatty Matter Contained in Fats andOils1This standard is issued under the fixed designation D5560;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the
2、 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 method covers all degraded glycerides,sincethey are neutral fats.However,this procedure does not neces-s
3、arily determine all the mono and diglycerides that may bepresent in the sample.This is due to the water solublecharacteristics of some mono and diglycerides.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard do
4、es 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 Standar
5、ds:2D5553 Test Method for Determination of the UnsaponifiableNonvolatile Matter in Sulfated Oils3.Significance and Use3.1 This test method is intended for the determination of theneutral fatty matter contained in fats and oils by means of etherextraction.4.Apparatus and Reagents4.1 Erlenmeyer Flask,
6、125 mL.4.2 Separatory Funnel.4.3 NaOH,0.5 N.4.4 Petroleum Ether.4.5 Phenolphthalein Indicator.4.6 Ethyl Alcohol,denatured.5.Procedure5.1 Weigh 5 g of sample into a 125-mL assay flask and add50 mL of alcohol.Warm and rotate,if necessary,to dissolve.Titrate with 0.5 N NaOH to end point using phenolpht
7、haleinindicator.Cool,then add 1 mL excess 0.5 N NaOH and rotateflask.Extract three times with 50-mL portions of petroleumether and wash combined ether layers with water until freefrom alkali.Evaporate ether and dry to constant weight.6.Calculation6.1 Calculate the total neutral oily matter as follow
8、s:total neutral oily matter5weight of residue3100weight of sample(1)6.2 Determine the total neutral oily matter includingunsaponifiables,if any,as in Test Method D5553,and subtractto obtain neutral fatty matter.7.Precision and Bias7.1 This test method is adopted from the procedures of theAmerican Le
9、ather ChemistsAssociation where it has long beenin use and where it was approved for publication before theinclusion of precision and bias statements was mandated.Theoriginal interlaboratory test data are no longer available.Theuser is cautioned to verify by the use of reference materials,ifavailabl
10、e,that the precision and bias(or reproducibility)of thistest method is adequate for the contemplated use.8.Keywords8.1 fats and oils;leather;neutral fatty matter1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.08 on Fats
11、 and Oils.This testmethod was developed in cooperation with the American Leather Chemists Assn.(Method H 53-1957).Current edition approved Jan.1,2011.Published March 2011.Originallyapproved in 1994.Last previous edition approved in 2006 as D5560 95(2006).DOI:10.1520/D5560-95R11.2For referenced ASTM
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