1、Designation: E1521 14Standard 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 numbe
2、r 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 liquid holdingcapacity (LHC) of granular carriers.1.2 The values stated in SI units are to be rega
3、rded 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 practices and determi
4、ne the applica-bility 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 all
5、ows calculation ofthe 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 desi
6、gned principally forgranular 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
7、 to 100 mesh (4.75 to 0.150 mm).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
8、solventslike Exxsol(R) D110 from Exxon Mobile 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
9、properprecautions to prevent skin contact and 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
10、 7.0 6 0.1 g of granular carrier for LHC deter-mination into a 29.6-mL glass bottle.6.2 From a buret, add a suitable fluid as follows: 0.5-mLincrements until 2.0 mL is reached, or the carrier meets one endpoint condition. Shake between increments by hand or me-chanical shaker until completely absorb
11、ed. (A few sharp tapswith the heel of the hand may be necessary 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. Thee
12、nd point is indicated by two or more of the following:6.3.1 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 inst
13、ructions given in 6.1 6.3, but use the 236.8-mL jar.Add an initial 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
14、 the directresponsibility of Subcommittee E35.22 on Pesticide Formulations 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
15、Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.5 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:% LHC 5ml fluid! 3 fluid specific gravity! 3
16、100!g granules!1ml fluid! 3 fluid Specific gravity!(1)7.2 Round the % LHC to the nearest 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
17、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 of any
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