ASTM D4900-1999(2016) Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts《鞣质提取物中木素磺酸盐 (亚硫酸盐纤维素) 的标准试验方法》.pdf
《ASTM D4900-1999(2016) Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts《鞣质提取物中木素磺酸盐 (亚硫酸盐纤维素) 的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4900-1999(2016) Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts《鞣质提取物中木素磺酸盐 (亚硫酸盐纤维素) 的标准试验方法》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D4900 99 (Reapproved 2016)Standard Test Method forLignosulfonates (Sulfite Cellulose) in Tanning Extracts1This standard is issued under the fixed designation D4900; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear of 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 detecting thepresence of lignosulfonates (sulfite cellulose) in extract
3、s oftanning materials.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 user of this stan
4、dard 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:2D4901 Practice for Preparation of Solution of Liquid Veg-etable Tannin ExtractsD4905 Practice for Preparation of Solution of S
5、olid, Pastyand Powdered Vegetable Tannin ExtractsD6404 Practice for Sampling Vegetable Materials Contain-ing TanninD6405 Practice for Extraction of Tannins from Raw andSpent Materials2.2 ALCA Methods:A50 Lignosulfonates (Sulfite Cellulose)33. Summary of Test Method3.1 The reaction with aniline of a
6、tanning material extractspecimen is compared with that of a solution containinglignosulfonate and tanning material known to be free fromlignosulfonate.4. Significance and Use4.1 This test method is useful to detect possible adulterationof tanning material extract with cheap and inferior lignosul-fon
7、ates.5. Specimen5.1 The sample shall be drawn as described in PracticeD6404.5.2 The specimen shall consist of 5 mL of a solution ofanalytical strength (4.0 g tannin per L), prepared as describedin Practices D4901, D4905, and Practice D6405.6. Apparatus and Reagents6.1 Aniline.6.2 Hydrochloric Acid,
8、concentrated.6.3 Comparison SolutionThis shall contain lignosulfonate(sulfite cellulose) in the proportion of 1 g total solids to 2000mL of solution, and as much tanning material, similar to and ofthe same type as that being tested but known to be free fromlignosulfonate, as will make up the solutio
9、n to analyticalstrength.7. Procedure7.1 Place the specimen in a test tube. Add 0.5 mL of aniline,and shake well. Add 2 mL of concentrated hydrochloric acid,and again shake mixture well.8. Results8.1 If at least as much precipitate remains at the end of 15min as is obtained when the comparison soluti
10、on is similarlytreated, the material shall be held to contain lignosulfonates(sulfite cellulose) and the fact shall be noted on the analysisreport.8.2 Attention is drawn to the fact that some synthetictannins give precipitates under the conditions of this testmethod.9. Precision and Bias9.1 This tes
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