1、Designation: E 2043 99 (Reapproved 2006)Standard Test Method forNonvolatile Matter of Agricultural Adjuvant Solutions byThermogravimetry1This standard is issued under the fixed designation E 2043; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 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 non-volatile matter of agricultural tank m
3、ix adjuvant solutions bythermogravimetry.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 safety and health practices and determine the applica-bility of regulatory
4、 limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E 473 Terminology Relating to Thermal Analysis and Rhe-ologyE 1131 Test Method for Compositional Analysis by Ther-mogravimetryE 1519 Terminology Relating to Agricultural Tank MixAdjuvants3. Terminology3.1 Definitions:3.1.1 nonvolat
5、ile matter, nthe matter remaining afterheating an agricultural adjuvant solution at 50 6 2.5C for 16h.4. Summary of Test Method4.1 This test method is an empirical technique using ther-mogravimetry in which the mass of an agricultural adjuvant,heated at a controlled rate in an appropriate environmen
6、t, isrecorded as a function of time and temperature. Nonvolatilematter is the mass remaining after heating at a specific time andtemperature.5. Significance and Use5.1 This test method is intended for use in quality control,material screening, and related problem solving where anonvolatile content i
7、s desired or a comparison can be madewith a known material of the same type.5.2 The parameters described may be altered to suit aparticular analysis, provided the changes are noted in thereport.6. Apparatus6.1 Aluminum Weighing Dishes, flat bottom, 70 mL capac-ity.6.2 Analytical Balance, with a sens
8、itivity of 0.01 g.6.3 Desiccator.6.4 Drying Oven, gravity convection-type, capable of main-taining a temperature of 50 6 2.5C. If many determinations ofsolvent-based adjuvants are being made at the same time, anexplosion-proof oven should be used.7. Procedure7.1 Bring the material to be tested to eq
9、uilibrium tempera-ture at 25 6 5C.7.2 Dry two flat-bottomed aluminum weighing dishes in anoven at 50 6 2.5C for 1 h. Allow the dishes to return toambient temperature in a desiccator.7.3 Weigh each dish, making the determination in duplicate.Record the weight of the weighing dish to the nearest 0.01
10、g.7.4 Add approximately 2.0 6 0.1 g of agricultural adjuvantsolution to the aluminum weighing dish. Record the totalweight of the sample and dish to the nearest 0.01 g.7.5 Place the dish in an oven at 50 6 2.5C. Maintain thistemperature for 16 h 6 5 min. Begin timing when the oven hasreturned to tem
11、perature after loading.7.6 After heating is complete, place the dish in a desiccatorand allow it to return to ambient temperature.7.7 Weigh the dish and sample to the nearest 0.01 g.1This test method is under the jurisdiction of ASTM Committee E35 onPesticides and Alternative Control Agents and is t
12、he direct responsibility ofSubcommittee E35.22 on Pesticide Formulations and Delivery Systems.Current edition approved Nov. 1, 2006. Published November 2006. Originallyapproved in 1999. Last previous edition approved in 1999 as E 2043 99.2For referenced ASTM standards, visit the ASTM website, www.as
13、tm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Calcu
14、lation8.1 Calculate the percent nonvolatile matters, using thefollowing equation:S 5R 2 TW 2 T3 100 (1)where:R = final weight of residue and pan, g,T = tare weight of pan, g, andW = initial weight of sample and pan, g.9. Precision and Bias9.1 Duplicate determination should not differ by more than0.5
15、 % of the mean value.10. Keywords10.1 adjuvant; agriculture; nonvolatile matter; pesticide;solids; thermogravimetryASTM 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 ad
16、vised that determination of the validity of any such patent rights, and the riskof infringement of such 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, eithe
17、r reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional 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.
18、If you feel that your comments have not received a fair hearing you shouldmake your views known to the 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).E 2043 99 (2006)2
