ASTM D6403-1999(2009) 923 Standard Test Method for Determining Moisture in Raw and Spent Materials《原材料和用过的材料中测定潮气的标准试验方法》.pdf
《ASTM D6403-1999(2009) 923 Standard Test Method for Determining Moisture in Raw and Spent Materials《原材料和用过的材料中测定潮气的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6403-1999(2009) 923 Standard Test Method for Determining Moisture in Raw and Spent Materials《原材料和用过的材料中测定潮气的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6403 99 (Reapproved 2009)Standard Test Method forDetermining Moisture in Raw and Spent Materials1This standard is issued under the fixed designation D 6403; 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.1. Scope1.1 This test method is intended for use in determining themoisture content in raw and spent materials that are extracted
3、for tannin analysis. The moisture content of the sample isoperationally defined to be equal to the weight loss experiencedas a result of the evaporation which occurs in the drying oven.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in this
4、standard.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 determine the applica-bility of regulatory limitations prior to use.2. Ref
5、erenced Documents2.1 ASTM Standards:2D 6405 Practice for Extraction of Tannins from Raw andSpent Materials2.2 ALCA MethodsA6 Moisture in Raw and Spent Materials33. Terminology3.1 Definitions:3.1.1 raw materialany of the various parts of plants thatare used as a source of vegetable tannins.3.1.2 spen
6、t materialplant tissue by-products from indus-trial processes which may contain significant quantities ofvegetable tannins.3.1.3 tanninan astringent substance found in the variousparts of plants such as bark, wood, leaves, nuts, fruits, roots,etc.3.1.4 vegetable tanninsmixtures of substances (natura
7、lproducts) obtained from plant tissues by water extractionwhich have the chemical and physical properties necessary toconvert animal hides and skins into leather.4. Summary of Test Method4.1 A specimen of the material sample prepared for use inPractice D 6405 is dried overnight in a forced-air oven.
8、 Theloss in weight represents the moisture in the specimen.5. Significance and Use5.1 This test method is used to determine the moisturecontent of materials (raw or spent) that are to be extracted fortannin analysis. The value obtained for moisture content by thistest method is used to calculate the
9、 results of the other analyseson this material to a moisture-free basis.5.2 The specimens are obtained from the material preparedfor extraction in Practice D 6405.5.3 Tanning materials contain moisture in varying amounts,depending both on the nature of the material and on theclimatic conditions, the
10、refore sampling must be carried out asquickly as is consistent with thoroughness in order to avoidchanges in moisture content.5.4 Negative errors may occur in the moisture determinationbecause under the conditions of this method there may beretention of moisture by certain components (for example,hy
11、drated salts or water bound to organic structures) of the rawor spent material or because of oxidation of other components(for example, tannins) of the raw or spent material.5.5 Positive errors may occur in the moisture determinationbecause under the conditions of this test method there may bevolati
12、lization of certain components of the raw or spentmaterial other than water.5.6 It is known that other factors can also affect the quantityof volatile matter (moisture) released by the specimen. Thesefactors include but are not limited to: particle size of the testspecimen, quantity of test specimen
13、, oven temperature, expo-sure time in the oven, shape of the specimen container, andtype of oven (for example, gravity or mechanical convection)used.5.7 Because of the possibility of unknown errors in this testmethod it is essential that the method be followed exactly inorder to obtain reproducible
14、results both among specimenswithin a laboratory and for analyses between laboratories.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. Thistest method has been adapted from and is a replacement f
15、or Method A6 of theOfficial Methods of the American Leather Chemists Association.Current edition approved April 1, 2009. Published July 2009. Originallyapproved in 1999. Last previous edition approved in 2004 as D 6403 99 (2004).2For referenced ASTM standards, visit the ASTM website, www.astm.org, o
16、rcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Official Methods of the American Leather Chemists Association. Availablefrom the American Leather Chemists Association, University
17、of Cincinnati, P.O.Box 210014, Cincinnati, OH 45221-0014.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Apparatus6.1 Balance, analytical balance which will weigh up to 100g with an accuracy of 6 0.1 mg (6 0.0001 g).6.2 Tannin Dis
18、h, crystallizing dish, borosilicate glass, 50mm tall, 70 mm outside diameter. The bottom corner shall berounded to a radius of 6 mm, the bottom shall be flat and notcupped in the center, and the top edge shall be rounded andpolished.6.3 Watch Glass, a suitable size to be used as a cover for thetanni
19、n dishes. These can be used to keep dust and otherpossible contaminates from settling into the dishes whileexposed to the laboratory environment before and after thespecimen transfer operation. The watch glass covers must beremoved prior to placing the dishes in the drying oven.6.4 Drying Oven, a fo
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