1、Designation: E 726 01 (Reapproved 2006)Standard Test Method forParticle Size Distribution of Granular Carriers and GranularPesticides1This standard is issued under the fixed designation E 726; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、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 is used to determine the particle sizedistribution of granular carriers and gr
3、anular pesticides.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 limitations prior to u
4、se. For specific hazardstatements, see Section 6.2. Referenced Documents2.1 ASTM Standards:2E11 Specification for Wire Cloth and Sieves for TestingPurposesE 725 Test Method for Sampling Granular Carriers andGranular Pesticides3. Summary of Test Method3.1 A known weight of the granular carrier or gra
5、nularpesticide is placed on the top sieve of a stacked set of U.S.standard sieves and shaken under standard conditions for aspecified period of time. The weight percent of the granulesretained on each sieve and the bottom pan is determined.4. Significance and Use4.1 This procedure was designed princ
6、ipally for clay, corn-cob, nut shell paper, or sand granular carriers and granularpesticide products, but need not be limited to these materials.There may be more appropriate test methods for other types ofgranular carriers and products.5. Apparatus5.1 Brushes; Tyler Part No. 8576 soft brass wire br
7、ush, orequivalent, for 100 mesh (150 m) and coarser sieves. Tylernylon bristle brush (Part No. 8577), or equivalent, for screensfiner than 100 mesh.5.2 Mechanical Sieve Shaker; a Tyler RoTap sieve shaker,or equivalent, or other agreed upon device.5.3 Sieves; U.S. standard 8-in. (20.3 cm) diameter si
8、eves,or equivalent, conforming to Specification E11.5.4 Bottom Receiver Pan and Top Sieve Cover.5.5 Interval Timer; adjustable, with an accuracy of 610 s.5.6 Balance; sensitivity of 0.1 g.6. Hazards6.1 Before testing, read the precautionary statements on theproduct label, and the Material Safety Dat
9、a Sheet, or both. Takeproper precautions to prevent skin contact and inhalation of thefines, or the vapors, or both. Take care to prevent contamina-tion of the surrounding area. Always wear the appropriatesafety equipment and, where indicated, wear respiratory de-vices approved by NIOSH for the prod
10、uct being tested.7. Procedure7.1 Clean and stack the specified sieves in order of size withthe pan on the bottom, and the sieve with the largest mesh onthe top.7.2 Use a representative sample of approximately 1006 5gas defined in Test Method E 725.7.3 Weigh the sample to 60.1 g.7.4 Transfer the whol
11、e weighed fraction onto the top sieve,cover and shake for the time given in the product specificationor 10 min if time is not specified.7.5 Remove the sieve assembly from the sieve shaker and,using the brush, quantitatively transfer the granular material onthe top sieve to a tared weighing pan and w
12、eigh to the nearest1This test method is under the jurisdiction of ASTM Committee E35 onPesticides and Alternative Control Agents and is the direct responsibility ofSubcommittee E35.22 on Pesticide Formulations and Delivery Systems.Current edition approved Nov. 1, 2006. Published November 2006. Origi
13、nallyapproved in 1980. Last previous edition approved in 2001 as E 726 01.2For 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
14、ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.0.1 g. Record the value as the sieve fraction weight for thatsieve. Repeat this procedure for material retained on each sieveand the bottom receiver pan.7.6 Determine the d
15、istribution on duplicate samples.8. Calculation8.1 Calculate the particle size distribution of each sample tothe nearest 0.1 % and the average of the two samples to thenearest 0.1 % as follows:R 5 F/S! 3 100where:F = sieve fraction weight,S = sum of sieve fraction weights, andR = percent retained on
16、 each sieve.8.1.1 Add the weights of each sieve fraction. If the sumdeviates more than 2.0 g from the sample weight, repeat theanalysis.9. Precision and Bias9.1 This procedure yields comparative data. The pass/failaspect of the test should be determined by applicable specifi-cations. When used for s
17、pecification purposes, the mechanicalshaker and test conditions must be agreed upon.10. Disposal of Sample10.1 After testing, store all materials in a safe manner anddispose of used material in accordance with product labeldirections, or the Material Safety Data Sheets, or both.11. Keywords11.1 gran
18、ular carriers; pesticides; screens; sieves; sizedistributionASTM 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 pa
19、tent 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 ei
20、ther 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. If you feel that your comments have not received a fair
21、 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 726 01 (2006)2
