ASTM D4653-1987(2009) Standard Test Method for Total Chlorides in Leather《皮革中总氯化物的试验方法》.pdf
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1、Designation: D 4653 87 (Reapproved 2009)Standard Test Method forTotal Chlorides in Leather1This standard is issued under the fixed designation D 4653; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber 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 Department of Defense.1. Scope1.1 This test method is intended for use in determining total
3、chlorides in mineral tanned 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 theresponsibility of the use
4、r 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:2D 2813 Practice for Sampling Leather for Physical andChemical Tests3. Significance and Use3.1 This test method i
5、s used to determine amount of solublechlorides in leather.4. Apparatus4.1 Volumetric Flask, 250 mL.5. Reagents5.1 Acetic Acid Solutions5 or 10 % by volume.5.2 Methyl Orange0.02 % solution in 50 % alcohol.5.3 Ammonium Hydroxide Solution, (0.1 N).5.4 Silver Nitrate, Standard Solution, (0.1 N).5.5 Pota
6、ssium Chromate Solution,5%.6. Sampling, Test Specimens and Test Units6.1 The test specimen shall consist of1gofleather from thecomposite sample in accordance with Practice D 2813.6.2 Two specimens from the composite sample shall betested.7. Procedure7.1 Weigh the specimen to the nearest milligram an
7、d recordthe value as W. Transfer the specimen to a 250 mL volumetricflask and add 200 mL of 0.1 N ammonium hydroxide solution.Immerse the flask up to the neck in a bath of boiling water.Thoroughly wet all particles by occasional swirling. After 2 h,cool the flask to room temperature and make the fla
8、sk up tovolume with distilled water, shake and without delay filterthrough a folded filter paper.7.2 Discard the first 20 to 25 mL of the filtrate. Pipette 200mL of the filtrate into a 600 mL beaker, add a few drops ofmethyl orange indicator and neutralize with 5 % acetic acid toan orange color.Add
9、2 to 3 mL of 5 % potassium chromate andtitrate the solution with 0.1 N silver nitrate. Record themillilitre of silver nitrate asA. Titrate 200 mL of distilled watercontaining a few drops of methyl orange indicator and 2 to 3mL of 5 % potassium chromate with 0.1 N silver nitrate as ablank and the mil
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