1、Designation:D601797(Reapproved 2015)Standard Test Method forDetermination of Magnesium Sulfate(Epsom Salt)inLeather1This standard is issued under the fixed designation D6017;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers quantitativel
3、y determining themagnesium sulfate(epsom salt)in leather.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 does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsi
4、bility 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:2D3790 Test Method for Volatile Matter(Moisture)ofLeather by Oven Drying2.2 Federal Standards:Fed
5、eral Test Standard No.311,Method 6541 MagnesiumSulfate(Epsom Salt)33.Significance and Use3.1 This test method distinguishes magnesium sulfate fromother water soluble non-tanning salts found in leather.4.Apparatus4.1 Platinum Crucible.4.2 Filtering Crucible.4.3 Suction Flask.4.4 Muffle Furnace.5.Reag
6、ents5.1 Hydrochloric Acid,specific gravity 1.19.5.2 Nitric Acid,specific gravity 1.42.5.3 Ammonium Chloride.5.4 Ammonium Hydroxide,1 to 1 and 1 to 9 parts by volumewith distilled water.5.5 Ammonium Nitrate Solution,10 g dissolved in distilledwater and made up to 100 mL.5.6 Ammonium Oxalate,saturated
7、 solution.5.7 Ferric Chloride Solution,10 g dissolved in distilledwater and made up to 100 mL.5.8 Methyl Orange Indicator,0.05%.5.9 Sodium Ammonium Hydrogen Phosphate,saturated so-lution.6.Procedure6.1 Unless otherwise specified in the material specification,determine the moisture content of the com
8、posite sample fromwhich the test specimen is drawn,in accordance with TestMethod D3790.Determine the weight of the composite speci-mens for moisture content at the same time and under the sameambient conditions as the specimens weighed for chemicaltests.6.2 Place the specimen in a tared porcelain cr
9、ucible,5 gweighed to the nearest 0.001 g,and record the value as W2.Place the weighed specimen in a cold muffle furnace orprecarbonize over a burner prior to placing in a hot furnace.Gradually raise the temperature of the furnace to 600 6 25Cand maintain at this temperature for 60 min.Remove thecruc
10、ible and contents,cool in a desiccator,and weigh.Replacein the furnace at 600 6 25C for 30 min and repeat the coolingand weighing procedure until a constant weight is obtained(60.01 g).If it is difficult to obtain a constant weight,leach theresidue with hot distilled water and filter through an ashl
11、essfilter paper.Place the filter paper in the crucible and ash.Add1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on ChemicalAnalysis.Thistest method was developed from Federal Test Method Standard No.311,Method 6541
12、 in cooperation with the U.S.Army Natick Research Development&Engineering Center,Natick MA and the Defense Personnel Support CenterDirectorate of Clothing and Textiles,Philadelphia PA.Current edition approved Sept.1,2015.Published October 2015.Originallyapproved in 1996.Last previous edition approve
13、d in 2009 as D6017 97(2009).DOI:10.1520/D6017-97R15.2For 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.3Available fro
14、m Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20402.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the filtrate to the crucible and evaporate.The crucible shall thenbe put back in the muffle furnace and heated
15、,cooled,andweighed as above until a constant weight(60.01 g)has beenobtained.6.3 Moisten the ash with distilled water and add 15 mL ofhydrochloric acid(specific gravity 1.19)to the crucible.Transfer the contents of the crucible to a 400 mL beaker anddilute to about 60 mL with distilled water.Add two
16、 drops ofnitric acid(specific gravity 1.42)and heat the solution on asteam bath for about 15 min.Add ammonium hydroxide(1:1)dropwise,while stirring,until the solution is slightly alkaline tomethyl orange or a faint odor of ammonia appears at this point.If the precipitate does not have the characteristic reddish-brown color of ferric hydroxide,dissolve the precipitate inhydrochloric acid,add a few drops of ferric chloride solution,and repeat the addition of a slight excess of ammoniumhydroxide.Bo
