1、Designation:D420082(Reapproved 2019)Standard Test Method forEvaluating Inhibitory Effects of Ink Grids on MembraneFilters1This standard is issued under the fixed designation D4200;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
2、ear 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 test method describes a procedure whereby the userof ink-gridded membrane filters in water quality studies cana
3、scertain whether or not the grid lines are toxic and inhibitoryto bacterial growth when the membrane and its entrappedbacteria are incubated on a suitable media.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 standar
4、d 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This internation
5、al standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.
6、2.Referenced Documents2.1 ASTM Standards:2D1129 Terminology Relating to WaterD1193 Specification for Reagent Water3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology D1129.4.Summary of Test Method4.1 A heavy bacterial suspension is filtered through a
7、gridded membrane filter.The bacterial concentration employedis sufficient to cover much of the membrane with bacterialcolonies.4.2 After filtration the membrane is incubated on a suitablemedium and the distribution of the colonies and shape of thecolonies noted in the area around each grid line.5.Si
8、gnificance and Use5.1 This test method may be applied to determine thesuitability of grid-marked membrane filters for use in bacte-riological culture techniques for the detection and enumerationof bacterial organisms.5.2 A particularly sensitive organism and growth conditionshave been selected for t
9、his test method in order to maximizesensitivity to toxic materials possibly present in the inks usedfor grid-marking membrane filters.6.Apparatus6.1 Incubator,capable of maintaining temperatures of44.5 6 0.2C.6.2 Membrane Filtration Units.6.3 Vacuum Source with trap vessel.6.4 Forceps,blunt-nosed.6.
10、5 Autoclave or other sterilizing equipment.6.6 Expendables:6.6.1 Gridded membrane filters.6.6.2 1-mL and 10-mL pipets.6.6.3 Petri dishes(50-mm)containing 6 to 8 mL of agarmedium or a 100-mm dish with 20 6 2 mL of agar medium,orboth.6.6.4 Erlenmeyer flasks.7.Reagents and Materials7.1 Purity of WaterU
11、nless otherwise indicated,referenceto water shall be understood to mean reagent water conformingto reagent water Type II of Specification D1193.1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.08 on Membranes and IonExchan
12、ge Materials.Current edition approved Nov.1,2019.Published January 2020.Originallyapproved in 1982.Last previous edition approved in 2011 as D4200 82(2011).DOI:10.1520/D4200-82R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.Fo
13、r 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 StatesThis international standard was developed in accordance with internationally r
14、ecognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.7.2 M-FC Agar with Rosolic Acid or equivalent(henceforthreferred
15、 to as agar medium),formulated,prepared,and dis-pensed in accordance with the manufacturers specifications.7.3 Tryptone Soya Broth or equivalent(henceforth referredto as broth medium),formulated,prepared,and dispensed inaccordance with the manufacturers specifications.7.4 Peptone Water,0.1%,sterile.
16、7.5 Broth Culture of E.coli ATCC 11229,18-h,prepared asfollows:Add 1 mL of an 18 6 2-h broth culture of E.coliATCC 11229 to 99 mL of 0.1%peptone water,mixthoroughly,then add 0.1 mL of this suspension to another flaskcontaining 99 mL of 0.1%peptone water.This is the workingconcentration and should contain approximately 103bacteriaper millilitre to provide contiguous but discrete growth.NOTE1Hydrophobic leaching may cause growth inhibition in areasadjacent to grid lines.8.Procedure8.1 Assemble the
