1、Designation:E204499(Reapproved 2012)Standard Test Method forSpreading of Liquid Agricultural Spray Mixtures1This standard is issued under the fixed designation E2044;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last re
2、vision.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 visual evaluation of therelative spread radius of liquid spray mixture droplets.1.2 The values stated
3、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 establish appro-priate safety and health
4、 practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E1519 Terminology Relating to Agricultural Tank Mix Ad-juvants3.Terminology3.1 Definitions:3.1.1 adjuvant,na material added to a tank mix to aid ormodify the action of an agro
5、chemical,or the physical charac-teristics of the mixture.(See Terminology E1519.)3.1.2 spreader,na material that increases the area that adroplet of a given volume of spray mixture will cover on atarget.(See Terminology E1519.)3.1.3 spread radius,nthe radius in millimetres or someother standardized
6、unit,of a substrate covered by a droplet.4.Summary of Test Method4.1 The material(s)to be tested is mixed using the desiredconcentration of each component.4.2 A 20-L droplet of the spray mixture is placed carefullyonto a substrate.Under this substrate is a graph with concentricrings spaced at 1-mm i
7、ntervals.4.3 After 60 s,the number of rings that the droplet covers,and thus the radius of the droplet,is observed and recorded.5.Significance and Use5.1 This test method is intended to provide a rapid means ofdetermining the relative ability of a liquid agricultural spraymixture to spread on a test
8、 substrate.5.2 This test method was validated using Parafilm M3as atest substrate.It is the users responsibility for determining thevalidity of this test method for alternative test surfaces.Whileit may be generally agreed upon that there is no perfect modelfor the variety of surfaces for which spre
9、ading informationwould be useful,this test method does not limit users to anyone surface.Further consideration must also be given to thepotential effect that the liquid droplet may have on thechemical composition and morphology of the test surface.While this does not restrict the test method,an unde
10、rstandingof this potential can help in the interpretation of test data.5.3 This test method will determine the relative spread ofradii of water,fertilizers,oils,and mixtures of these carrierswith surfactants.It is the users responsibility to determine thevalidity of the test method with alternative
11、liquids.5.4 This test method will determine the relative spread radiiof droplets over 30 s,60 s,and 5 min.It is the usersresponsibility to determine the validity of the test method atalternative spreading times.5.5 This test method is appropriate for relative humiditieswithin the range of 40 to 70%.
12、It is the users responsibility todetermine the validity of the test method at alternate relativehumidities.5.6 This test method is appropriate for temperatures withinthe range of 18 to 22C.It is the users responsibility todetermine the validity of the test method at alternate tempera-tures.1This tes
13、t method is under the jurisdiction of ASTM CommitteeE35 onPesticides,Antimicrobials,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 199
14、9.Last previous edition approved in 2006 as E2044 99(2006)1.DOI:10.1520/E2044-99R12.2For 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 o
15、nthe ASTM website.3The sole source of supply of the apparatus(Parafilm M,registered trademark)known to the committee at this time is American National Can Company,Chicago,IL 60631.If you are aware of alternative suppliers,please provide this informationto ASTM International Headquarters.Your comment
16、s will receive careful consid-eration at a meeting of the responsible technical committee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.7 This test method will determine the relative spread radiifor droplets of 10 and 20 L.It is the users responsibility todetermine the validity of the test method at alternate dropletsizes.6.Apparatus6.1 Petri Dishes,to be used inverted to make a flat surfaceon which to apply