ASTM E726-2001(2011)e1 1875 Standard Test Method for Particle Size Distribution of Granular Carriers and Granular Pesticides《粒状载体与粒状农药颗粒大小分布的标准试验方法》.pdf

《ASTM E726-2001(2011)e1 1875 Standard Test Method for Particle Size Distribution of Granular Carriers and Granular Pesticides《粒状载体与粒状农药颗粒大小分布的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM E726-2001(2011)e1 1875 Standard Test Method for Particle Size Distribution of Granular Carriers and Granular Pesticides《粒状载体与粒状农药颗粒大小分布的标准试验方法》.pdf（2页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: E726 01 (Reapproved 2011)1Standard 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 r

2、evision, 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.1NOTEAn editorial change was made to subsection 4.1 in August 2011.1. Scope1.1 This test method is used to de

3、termine the particle sizedistribution of granular carriers and granular 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 w

4、ith 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 use. For specific hazardstatements, see Section 6.2. Referenced Documents2.1 ASTM Standards:2E11 Specification f

5、or Woven Wire Test Sieve Cloth and TestSievesE725 Test Method for Sampling 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 con

6、ditions 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 principally for clay, corn-cob, nut shell, paper, or sand granular carriers and granularpesticide products, but need

7、 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 brush, orequivalent, for 100 mesh (150 m) and coarser sieves. Tylernylon bristle brush (Part No. 8577), or equiv

8、alent, 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 sieves,or equivalent, conforming to Specification E11.5.4 Bottom Receiver Pan and Top Sieve Cover.5.5 Interval T

9、imer; 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 Data Sheet, or both. Takeproper precautions to prevent skin contact and inhalation of thefines, or the vapors, or

10、 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 product being tested.7. Procedure7.1 Clean and stack the specified sieves in order of size withthe pan on the bott

11、om, and the sieve with the largest mesh onthe top.7.2 Use a representative 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

12、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 weigh to the nearest0.1 g. Record the value as the sieve fraction weight for thatsieve. Repeat this procedure fo

13、r material retained on each sieveand the bottom receiver pan.1This test method is under the jurisdiction of ASTM Committee E35 onPesticides, Antimicrobials, and Alternative Control Agents and is the directresponsibility of Subcommittee E35.22 on Pesticide Formulations and DeliverySystems.Current edi

14、tion approved Aug. 1, 2011. Published August 2011. Originallyapproved in 1980. Last previous edition approved in 2006 as E726 01 (2006).DOI: 10.1520/E0726-01R11E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Boo

15、k 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.7.6 Determine the distribution on duplicate samples.8. Calculation8.1 Calculate th

16、e 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 each sieve.8.1.1 Add the weights of each sieve fraction. If th

17、e 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 specification purposes, the mechanicalshaker and test conditions

18、 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 granular carriers; pesticides; screens; sieves; sizedistributionAST

19、M 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 such rights, are en

20、tirely 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 standardsa

21、nd 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 the ASTM Committee

22、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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E726 01 (2011)12