ASTM_E_1518_-_05_2012.pdf

Designation:E151805(Reapproved 2012)Standard Practice forEvaluation of Physical Compatibility of Pesticides inAqueous Tank Mixtures by the Dynamic Shaker Method1This standard is issued under the fixed designation E1518;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,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 practice describes the method for the evaluation ofthe physical compatibility and stability of pesticide tankmixtures diluted for aqueous application.This practice mayalso be adapted to use with liquid fertilizers in replacement ofthe water diluent.1.2 Tank mix compatibility can be affected by many vari-ables.Care should be taken to duplicate test conditions.Thispractice addresses the standard variables such as time,temperature,water hardness,method of agitation,and degreeof agitation.1.3 Compatibility is complex and can be affected by othervariables such as order of addition,pH of the dilution water,pumping shear,etc.Under the parameters of this practice,theresults will define whether the pesticide mixture is or is notcompatible in the laboratory.Compatibility or incompatibilityshould be confirmed under field spray conditions.1.4 Proper safety and hygiene precautions must be takenwhen working with pesticide formulations to prevent skin oreye contact,vapor inhalation,and environmental contamina-tion.1.5 Read and follow all handling instructions for the specificformulation and conduct the test in accordance with goodlaboratory practice.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 This standard does not purport to address all of thesafety problems,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 use.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent Water3.Summary of Practice3.1 In this practice,pesticides are diluted in water and tankmixed at specific application rates.Evaluations are conductedunder dynamic conditions.Pesticides are mixed and kept underagitation by a mechanical shaker.Evaluations are conducted atchosen water hardnesses and temperatures.Compatibility ismeasured in terms of the dispersion stability and screenresidue.3.2 Pesticides being examined for mixing compatibilityshould be evaluated individually as controls.3.3 Order of AdditionPesticides should be tank mixed asrecommended on the product label.If the order of the additionis not specified,then all possible orders of addition should betested.The following is a general guide:(1)waster solubleconcentrates,(2)water dispersible granules(dry flowables),(3)wettable powders,(4)liquid flowables,and(5)emulsifiableconcentrates.4.Significance and Use4.1 This practice is designed for researchers,applicators,and end users of pesticides where one or more ingredients arebeing mixed into an aqueous spray system.The practice isuseful in determining physical compatibility of aqueous spraymixtures of pesticides and/or fertilizers.4.2 The practice is not designed to determine physicalcompatibility of non-aqueous based spray mixtures.4.3 The results or the testing should be used to determinethe compatibility of the mixture ingredients in dynamic appli-cations.Interpolation of static results to the expectations of theresults of this test is not encouraged.5.Apparatus5.1 Graduated Cylinder,100 mL,glass-stoppered.1This practice is under the jurisdiction of ASTM Committee E35 on Pesticides,Antimicrobials,and Alternative Control Agents and is the direct responsibility ofSubcommittee E35.22 on Pesticide Formulations and Delivery Systems.Current edition approved May 1,2012.Published June 2012.Originallyapproved in 1993.Last previous edition approved in 2005 as E1508 05.DOI:10.1520/E1518-05R12.2For 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 C700,West Conshohocken,PA 19428-2959.United States1 5.2 Pipets,graduated,wide tip,serological,various deliveryvolumes.5.3 Balance,accurate to 0.1 g.5.4 Sieve,US Standard,50 mesh(300 microns),3-in.diameter.NOTE1Other sieve mesh sizes may be used as defined by field-useapplications.5.5 Wide-Mouth Jars,4 oz with polyethylene seal cups.5.6 Shaker,wrist action,Burrell Model 75 or equivalent.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Ch