1、Designation:E152114Standard Test Method forLiquid Holding Capacity of Granular Carriers1This standard is issued under the fixed designation E1521;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 p
2、arentheses 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 liquid holdingcapacity(LHC)of granular carriers.1.2 The values stated in SI units are to be regarded asstand
3、ard.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 practices and determine the applica-b
4、ility of regulatory limitations prior to use.For specificprecautionary statements,see Section 5.2.Summary of Test Method2.1 Incremental amounts of suitable fluids are added to aknown weight of granular carrier.The point at which thegranules stick to the sides of the container allows calculation ofth
5、e LHC.3.Significance and Use3.1 This test method has been designed principally forgranular carriers with LHC greater than 5.0%.The incremen-tal amount of suitable fluid added can be adjusted down asneeded for carriers with LHC less than 5.0%.3.2 This test method has been designed principally forgran
6、ular carriers with a relatively rapid absorption of liquid.Some materials may absorb liquids more slowly than thedescribed times in the method.If such is the case,the time limitof two(2)min.may be extended.3.3 This test method is applicable to granules in the rangefrom 4 to 100 mesh(4.75 to 0.150 mm
7、).4.Apparatus and Reagents4.1 Buret Stand.4.2 Buret,10 to 25 mL,accurate to 0.2 mL.4.3 Glass Bottle,29.6 mL,with poly seal cap(7 by 3.5-cmoutside diameter).4.4 Glass Bottle,236.8 mL,wide mouth with poly seal cap.4.5 Suitable Fluids,dearomatized mixed aliphatic solventslike Exxsol(R)D110 from Exxon M
8、obile Chemical Company,that boil in the range of 250275C and have a specific gravityof 0.800.82.4.6 Balance,accurate to 60.1 g.5.Safety Precautions5.1 Before testing,read the precautionary statements on theproduct label and material safety data sheet.Take properprecautions to prevent skin contact an
9、d inhalation of the finesand vapors.Take care to prevent contamination of the sur-rounding area.Always wear the appropriate safety equipmentand,where indicated,wear respiratory devices approved byNIOSH for the product being tested.6.Procedure6.1 Weigh 7.0 6 0.1 g of granular carrier for LHC deter-mi
10、nation into a 29.6-mL glass bottle.6.2 From a buret,add a suitable fluid as follows:0.5-mLincrements until 2.0 mLis reached,or the carrier meets one endpoint condition.Shake between increments by hand or me-chanical shaker until completely absorbed.(A few sharp tapswith the heel of the hand may be n
11、ecessary to break up asaturated portion.)Shaking should not exceed 2 min.6.3 After the first 2.0 mL is added or one end pointcondition is met,decrease the increments to 0.2 mL andproceed as described in 6.2 until the end point is reached.Theend point is indicated by two or more of the following:6.3.
12、1 Carrier darkens or appears wet.6.3.2 Granules cease to be free flowing.6.3.3 Granules stick to sides of bottle.6.3.4 Granules stick to bottom of bottle when invertedslowly.6.4 An alternate procedure is to use 50 g of carrier.Followthe instructions given in 6.1 6.3,but use the 236.8-mL jar.Add an i
13、nitial 15 mL of fluid in 5-mL increments,as describedin 6.2.Thereafter,follow the steps outlined in 6.3.1This 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 For
14、mulations and DeliverySystems.Current edition approved Aug.1,2014.Published November 2014.Originallyapproved in 1992.Last previous edition approved in 2006 as E1521 01(2006).DOI:10.1520/E1521-14.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United Sta
15、tes1 6.5 For carriers with low LHC the initial increments of fluidadded may have to be adjusted down so the end points are notexceeded.7.Calculation7.1 Calculate%LHC as follows:%LHC5ml fluid!3fluid specific gravity!3100!g granules!1ml fluid!3fluid Specific gravity!(1)7.2 Round the%LHC to the nearest
16、 whole number.8.Disposal of Sample8.1 Store all materials in a safe manner after testing,anddispose of used material in accordance with the product labeldirections and material safety data sheet.9.Keywords9.1 formulations;granular carriers;liquid holding capacity;pesticidesASTM 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 o
