1、Designation:D430799(Reapproved 2015)Standard Practice forPreparation of Liquid Blends for Use as AnalyticalStandards1This standard is issued under the fixed designation D4307;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year o
2、f 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 practice covers a laboratory procedure for thepreparation of small volumes of multicomponent liquid blendsfor use as
3、 analytical standards.1.2 This practice is applicable to components that arenormally liquids at ambient temperature and pressure,or solidsthat will form a solution when blended with liquids.Butanescan be included if precaution is used in blending them.1.3 This practice is limited to those components
4、 that fulfillthe following conditions:1.3.1 They are completely soluble in the final blend.1.3.2 They are not reactive with other blend components orwith blend containers.1.3.3 The combined vapor pressure of the blended compo-nents is such that there is no selective evaporation of any of thecomponen
5、ts.1.3.3.1 The butane content of the blend is not to exceed10%.(WarningExtremely flammable liquefied gas underpressure.Vapor reduces oxygen available for breathing.)Com-ponents with a vapor pressure higher than butanes are not to beblended.1.4 The values stated in SI units are to be regarded as thes
6、tandard.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.2.Referenc
7、ed Documents2.1 ASTM Standards:2D1364 Test Method for Water in Volatile Solvents(KarlFischer Reagent Titration Method)3.Summary of Practice3.1 The individual blend components are precisely weighedand combined in an inert,tight sealing glass vial or similarcontainer.When volatility is a consideration
8、,the componentsof lowest vapor pressure(least volatile)are added first and thehighest(most volatile)last.Mass(weight)percent compositionof the final blend is calculated from the mass and purities of thepure components.Volume percent composition can be calcu-lated using the density of each component.
9、4.Significance and Use4.1 The laboratory preparation of liquid blends of knowncomposition is required to provide analytical standards for thecalibration of chromatographic and other types of analyticalinstrumentation.5.Apparatus5.1 Containers:5.1.1 Vial,glass,threaded neck,approximately 22 mLcapacit
10、y,short style.Vials of other capacity may be substituted,as required.When blending light sensitive components,useamber glass vials or wrap clear glass vials with black tape.5.1.2 Bottle Cap,molded plastic with TFE-fluorocarbon,polypropylene,or polyethylene conical liner.5.1.3 Bottle Cap,molded plast
11、ic with aluminum-foil liner.Aluminum-foil liners are preferred to other metal liners be-cause they seal better.5.1.4 Mininert Valve,screw cap,20 mm or appropriate sizeto match vial size used.These caps are especially valuable forpreparing blends that contain volatile components.NOTE1The use of Minin
12、ert valves is recommended when compo-nents lighter than hexane are contained in the liquid blends.5.2 Balance,capable of weighing to 0.1 mg.5.3 Pipet,dropping,medicine dropper.5.4 Spatula,semi-micro,scoop style.6.Reagents and Materials6.1 Blend Components,high-purity,as required dependingon the comp
13、osition requirements of the proposed blend.1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricantsand is the direct responsibility of Subcom-mittee D02.04.0A on Preparation of Standard Hydrocarbon Blends.Current edition approved Oct.1,2015.Publ
14、ished December 2015.Originallyapproved in 1983.Last previous edition approved in 2010 as D4307 99(2010).DOI:10.1520/D4307-99R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,re
15、fer 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 6.1.1 To verify the purity of blend components,analyzeeach compound by the same technique for which the blend isintended or by a
16、nother suitable technique.Check for otherimpurities such as water,if necessary.Water cannot be deter-mined with sufficient accuracy by most GC methods and mustbe measured by other procedures such as Test Method D1364,or equivalent,and the result used to normalize the chromato-graphic value.If any of the impurities found are othercomponents of the blend,determine their concentrations andmake appropriate corrections.7.Procedure7.1 Examine the vial and cap to verify that a leak-freeclosure is obtai
