1、Designation:D 3627 96(Reapproved 2000)Standard Test Method forColor of Cresylic Acids(“C”Series Standards)1This standard is issued under the fixed designation D 3627;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last re
2、vision.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 This test method covers the determination of the color ofcresylic acids.The material under test is compared to arbitrarycolor sta
3、ndards that are expressed in terms of the“C”seriescolor standards.21.2 The following applies to all specified limits in this testmethod for purposes of determining conformance with thisstandard.An observed value or a calculated value shall berounded off“to the nearest unit”in the last right hand dig
4、it usedin expressing limit,in accordance with the rounding off methodof Practice E 29.1.3 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
5、determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see Section 6.2.Referenced Documents2.1 ASTM Standards:D 1193 Specification for Reagent Water3D 3852 Practice for Sampling and Handling Phenol andCresylic Acid4E 29 Practice for Using Significant Digits
6、 in Test Data toDetermine Conformance with Specifications52.2Other Document:OSHA Regulations,29 CFR,paragraphs 1910.1000 and1910.120063.Significance and Use3.1 Color is an important characteristic in certain tar aciduse applications.This test method may be used for qualitycontrol and specification p
7、urposes by producers and users.4.Apparatus4.1 Bottles for Color Standards and for Testing,clear andunblemished,clean,French square,flint glass,flat-bottom,glass-stoppered,30-mL(1-oz)capacity bottles holding 31 to 33mL when filled to the neck.5.Reagents5.1 Purity of ReagentsReagent grade chemicals sh
8、all beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.7Other grades may beused provided it is first ascertained that the
9、reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Specification D 1193,Type IV minimum.5.3 Ferric Chloride(FeCl36H2O).5.4 C
10、obalt Chloride(CoCl26H2O).5.5 Hydrochloric Acid(sp gr 1.19)Concentrated hydro-chloric acid(HCl).6.Hazards6.1 Consult current OSHA regulations,suppliers MaterialSafety Data Sheets,and local regulations for all materialsutilized in this test method.7.Cleaning of Bottles7.1 All glassware should be thor
11、oughly cleaned,rinsed withdistilled water,and dried.8.Preparation of Reference Color Standards8.1 Use the following basic stock solutions for preparing thereference color standards:8.1.1 Solution AAdd 75 mL of concentrated HCl todistilled water in a 3000-mL volumetric flask,dilute to themark with wa
12、ter and mix thoroughly.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.02 on Oxygenated Aromatics.Current edition approved June 10,1996.Published August 1996.Originallypublished as D 3
13、627 77.Last previous edition D 3627 91.2These color standards have traditionally been known as the Barrett Color-“C”Series(Barrett Division of Allied Chemical Corp.)and have been in general usesince at least 1957.3Annual Book of ASTM Standards,Vol 11.01.4Annual Book of ASTM Standards,Vol 06.04.5Annu
14、al Book of ASTM Standards,Vol 14.02.6Available from Superintendent of Documents,U.S.Government PrintingOffice,Washington,DC 20402.7Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Ch
15、emical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United
16、States.8.1.2 Solution BDissolve 1000 g of FeCl36H2O inexactly 600 mL of Solution A.Filter the resulting solution ifany turbidity persists.8.1.3 Solution CDissolve 100 g of CoCl26H2O in ex-actly 100 mL of Solution A.Filter the resulting solution if anyturbidity persists.8.2 Prepare the reference color standard solutions as shownin Table 1 using a 100-mL buret to dispense volumes up to 250mL and using a 250-mL pipet for the remaining volumes.Mixeach solution thoroughly and immediately transfer to