1、Designation:E204399(Reapproved 2012)Standard Test Method forNonvolatile Matter of Agricultural Adjuvant Solutions byThermogravimetry1This standard is issued under the fixed designation E2043;the number immediately following the designation indicates the year oforiginal adoption or,in the case of rev
2、ision,the year 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 covers the determination of the non-volatile matter of agricultural tank mix adjuvant so
3、lutions bythermogravimetry.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 sta
4、ndard 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:2E473 Terminology Relating to Thermal Analysis and Rhe-ologyE1131 Test Method for Compositional Analysis by Thermo-gravimetryE1
5、519 Terminology Relating to Agricultural Tank Mix Ad-juvants3.Terminology3.1 Definitions:3.1.1 nonvolatile matter,nthe matter remaining after heat-ing an agricultural adjuvant solution at 50 6 2.5C for 16 h.4.Summary of Test Method4.1 This test method is an empirical technique using ther-mogravimetr
6、y in which the mass of an agricultural adjuvant,heated at a controlled rate in an appropriate environment,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 fo
7、r use in quality control,material screening,and related problem solving where anonvolatile content is 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.Appar
8、atus6.1 Aluminum Weighing Dishes,flat bottom,70 mL capac-ity.6.2 Analytical Balance,with a sensitivity 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,
9、anexplosion-proof oven should be used.7.Procedure7.1 Bring the material to be tested to equilibrium 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 th
10、e determination in duplicate.Record the weight of the weighing dish to the nearest 0.01 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.Ma
11、intain thistemperature for 16 h 6 5 min.Begin timing when the oven hasreturned to temperature after loading.7.6 After heating is complete,place the dish in a desiccatorand allow it to return to ambient temperature.1This test method is under the jurisdiction of ASTM Committee E35 onPesticides,Antimic
12、robials,and Alternative Control Agents and is the directresponsibility of Subcommittee E35.22 on Pesticide Formulations and DeliverySystems.Current edition approved Oct.1,2012.Published October 2012.Originallyapproved in 1999.Last previous edition approved in 2006 as E2043 99(2006).DOI:10.1520/E2043
13、-99R12.2For referenced ASTM standards,visit the ASTM website,www.astm.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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C
14、700,West Conshohocken,PA 19428-2959.United States1 7.7 Weigh the dish and sample to the nearest 0.01 g.8.Calculation8.1 Calculate the percent nonvolatile matters,using thefollowing equation:S 5R 2 TW 2 T3100(1)where:R=final weight of residue and pan,g,T=tare weight of pan,g,andW=initial weight of sa
15、mple and pan,g.9.Precision and Bias9.1 Duplicate determination should not differ by more than0.5%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 co
16、nnection 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 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,either reapproved or withdrawn.Your comments are invited either for revision of this standard or for additional standard
