1、Designation: E726 01 (Reapproved 2015)Standard Test Method forParticle Size Distribution of Granular Carriers and GranularPesticides1This standard is issued under the fixed designation E726; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, 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 is used to determine the particle sizedistribution of granular carriers and granu
3、lar pesticides.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 standard to
4、 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specific hazardstatements, see Section 6.2. Referenced Documents2.1 ASTM Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSievesE725 Test Method for Sa
5、mpling Granular Carriers andGranular Pesticides3. Summary of Test Method3.1 A known weight of the granular carrier or granularpesticide 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 gra
6、nulesretained on each sieve and the bottom pan is determined.4. Significance and Use4.1 This procedure was designed principally for clay,corncob, nut shell, paper, or sand granular carriers and granularpesticide products, but need not be limited to these materials.There may be more appropriate test
7、methods for other types ofgranular carriers and products.5. Apparatus5.1 Brushes; Tyler Part No. 8576 soft brass wire brush, 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 T
8、yler RoTap sieve shaker,or equivalent, or other agreed upon device.5.3 Sieves; U.S. standard 8-in. (20.3 cm) diameter sieves, orequivalent, 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 o
9、f 0.1 g.6. Hazards6.1 Before testing, read the precautionary statements on theproduct label, and the Material Safety Data 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. Al
10、ways wear the appropriatesafety equipment and, where indicated, wear respiratory de-vices approved by NIOSH for the product 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 representa
11、tive sample of approximately 1006 5gas defined in Test Method E725.7.3 Weigh the sample to 60.1 g.7.4 Transfer the whole 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
12、shaker and,using the brush, quantitatively transfer the granular material onthe top sieve to a tared weighing pan and weigh to the nearest0.1 g. Record the value as the sieve fraction weight for that1This test method is under the jurisdiction of ASTM Committee E35 onPesticides, Antimicrobials, and A
13、lternative Control Agents and is the directresponsibility of Subcommittee E35.22 on Pesticide Formulations and DeliverySystems.Current edition approved Oct. 1, 2015. Published November 2015. Originallyapproved in 1980. Last previous edition approved in 2011 as E726 01 (2011)1.DOI: 10.1520/E0726-01R1
14、5.2For 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
15、 C700, West Conshohocken, PA 19428-2959. United States1sieve. Repeat this procedure for material retained on each sieveand the bottom receiver pan.7.6 Determine the distribution on duplicate samples.8. Calculation8.1 Calculate the particle size distribution of each sample tothe nearest 0.1 % and the
16、 average of the two samples to thenearest 0.1 % as follows:R 5 F/S! 3100where:F = sieve fraction weight,S = sum of sieve fraction weights, andR = percent retained on 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
17、.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 specification purposes, the mechanicalshaker and test conditions must be agreed upon.10. Disposal of Sample10.1 After testing, store all
18、 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 granular carriers; pesticides; screens; sieves; size dis-tributionASTM International takes no position respecting the validity of any paten
19、t 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 such rights, are entirely their own responsibility.This standard is subject to revision a
20、t 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 standardsand should be addressed to ASTM International Headquarters. Your commen
21、ts 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 the ASTM Committee on Standards, at the address shown below.This standard is copyrighted
22、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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 01 (2015)2
