ASTM D1108-1996(2007) Standard Test Method for Dichloromethane Solubles in Wood《木材中二氯甲烷溶解物的标准试验方法》.pdf

1、Designation: D 1108 96 (Reapproved 2007) Technical Association of Pulp and Paper IndustryStandard Method T 204-os-76Standard Test Method forDichloromethane Solubles in Wood1This standard is issued under the fixed designation D 1108; the number immediately following the designation indicates the year

2、 oforiginal adoption or, in the case of revision, the year of last revision. 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 dichlo

3、-romethane soluble content of wood, which is a measure of thewaxes, fats, resins, oils, and similar materials.1.2 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 safet

4、y and health practices and determine the applica-bility of regulatory limitations prior to use. Specific precau-tionary statements are given in 4.1.2. Significance and Use2.1 Dichloromethane extractable content of wood is a mea-sure of such substances as waxes, fats, resins, phytosterols, andnonvola

5、tile hydrocarbons. The amount is influenced by season-ing or drying the wood.3. Apparatus3.1 Filtering CruciblesAlundum or fritted-glass filteringcrucibles of coarse porosity shall be used.3.2 Extraction ApparatusA compact form of Soxhletextraction apparatus, with ground-glass joints, is preferable.

6、The apparatus shall consist of the following items:3.2.1 Soxhlet Extraction Flask, having a capacity of 250mL.3.2.2 Soxhlet Extraction Tube, 45 to 50 mm in insidediameter, having a capacity to the top of the siphon ofapproximately 100 mL and a siphon tube approximately 55mm in height. Extraction tub

7、es of these dimensions siphonmore rapidly than extractors with higher siphon tubes.3.2.3 Condenser.4. Reagent4.1 Dichloromethane,98%,CH2Cl2, USPNOTE 1Dichloromethane has been determined to be a suitable sub-stitute for ether. It is much safer to use and thus recommended for thisprocedure. (WarningDi

8、chloromethane causes narcosis when inhaledand can be irritating to the eyes. Proper caution should be used.)5. Test Specimen5.1 The test specimen shall consist of2gofair-driedsawdust that has been ground to pass a 425-m (40 mesh sieve)and be retained on a 250-m (60 mesh) sieve.6. Procedure6.1 Weigh

9、two 2-g test specimens in tared Alundum orfritted-glass crucibles. Dry one specimen in an oven for2hat100 to 105C; then place in a loosely stoppered weighingbottle, cool in a desiccator, and weigh. Continue the drying for1-h periods until the weight is constant. Calculate the propor-tion of moisture

10、-free sawdust in the air-dry specimen.6.2 Place the other specimen in a Soxhlet extraction appa-ratus having a tared Soxhlet extraction flask. Set a small disk offine-mesh screen wire in the top of the crucible to prevent lossof sample. Extract with 150 mL of dichloromethane for 6 to 8h, keeping the

11、 solvent boiling briskly. This should provide atleast six to eight siphonings per hour.6.3 After evaporating the solvent from the extraction flask,dry the flask and contents in an oven for 1 h at 100 to 105C,cool in a desiccator, and weigh. Continue the drying until thereis no further loss in weight

12、.7. Calculation and Report7.1 Report the results as percentage by weight of dichlo-romethane soluble matter in the moisture-free wood, calculatedas follows:dichloromethane soluble matter, % 5 W2/W1P! 3 100 (1)where:W2= weight of dried extract (6.3),W1= weight of test specimen used in 6.2, andP = pro

13、portion of moisture-free sawdust in the air-dryspecimen 6.1.7.2 Base the results on the average of at least two determi-nations.8. Precision and Bias28.1 Values obtained in a round robin test involving fivelaboratories and two woods indicated a repeatability of 4 %and a reproducibility of 21 %.1This

14、 test method is under the jurisdiction of ASTM Committee D07 on Woodand is the direct responsibility of Subcommittee D07.01 on Fundamental TestMethods and Properties.Current edition approved April 1, 2007. Published April 2007. Originallyapproved in 1950. Last previous edition approved in 2001 as D

15、1108 96 (2001).2Data for this section obtained from the Technical Association of the Pulp andPaper Industry, P.O. Box 105113, Atlanta, GA 30348.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.2 Bias is unknown.9. Keywords9.1 dichlo

16、romethane; woodASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of s

17、uch rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for add

18、itional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to t

19、he ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 1108 96 (2007)2