1、-ASTM D2009 b5 W 0759530 00b3877 8 W 4(Th Designation:D 2009-65(Reapproved 1990)An American National Standarc.Standard Practice for Collection by Filtration and Determination of Mass,Number,and Optical Sizing of Atmospheric Particulates This standard is issued under the fixed designation D 2009;the
2、number immediately following the designation indicates the year of.original adoption or,in the case of revision.the p a r of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(3 indicates an editorial change since the last revision or reapproval.Tliis p
3、raciice Itas been approredlor itse by ageticies ofthe Departttienr of DeJetise atid for lisiitig ti lie DoD Itidex o f Specijicniiotis atid Siatidards.1.Scope 1.1 This recommended practice covers the sample collec-tion of particulate matter from an atmosphere by filtration and for measurement of mas
4、s amount,particle size,and particle size distribution of the collected material.Variations in the recommended practice permit sampling to meet a number of widely different assay needs.Although especially applicable to collection of solid particles,the filter method may be used also to collect liquid
5、 particles if droplet size need not be determined.2.Referenced Documents 2.1 ASTM Standards:D 1356 Definitions of Terms Relating to Atmospheric D 1357 Practice for Planning the Sampling of the Ambient D 1704 Test Method for Particulate Matter in the Atmos-Sampling and Analysis2 Atmosphere phere(Opti
6、cal Density of Filtered Deposit)3.Definitions practice,refer to Definitions D 1356.3.1 For definitions of terms used in this recommended 4.Summary of Recommended Practice 4.1 A measured and representative sample of the atmos-phere under investigation is drawn through a filter medium selected to arre
7、st and permit measurement of the particles that are to be studied.For most purposes,the exposed filter medium is removed from the sampling device and appro-priate examination methods then applied to the collected matter.This recommended practice provides for determina-tion of mass loading,particle c
8、oncentration,particle size and size distribution,and particle inspection.Chemical composi-tion,radioactivity,and other characteristics of the particles may be determined by additional methods not included in this recommended practice.Studies by phase microscopy,electron microscopy,or other technique
9、s also may be made on the collected material.I This recommended practice is under the jurisdiction of ASTM Committee D-22 on Sampling and Analysis of Atmospheres and is the direct responsibility of Subcommittee D22.03 on Ambient Atmospheres and Source Emissions.Current edition approved Aug.31,1965.P
10、ublished October 1965.Originally published as D 2009-62 T.Last previous edition D 2009-62.Atinnal Book oJASTM Siaridards,Vol 1 1.0 3.56 5.Apparatus 5.1 Sample Collector-Figure 1 shows,schematically,a typical arrangement of apparatus parts in a filter sampling system.These include a sampling nozzle,f
11、ilter holder,filter medium,flow-measuring device,flow-inducing device,and means for regulating the flow of the sample air or gas.5.1.1 It is important that the filter be upstream from the rest of the apparatus so that any dirt in the system,manom-eter liquid,or pump oil will not be camed accidentall
12、y into the filter.The filter should be as close as possible to the sampling point,and any sampling lines must be perfectly clean.When sampling from a moving stream,as in a duct or stack,careful attention must be given to the shape and posi-tion of the nozzle.Recognized principles of stream sampling
13、must be used,otherwise the particles collected may not be representative of those in the test atmosphere For sam-pling in the open,a nozzle is not needed.5.1.1.1 Filter Holder-The filter holder must be such as to hold the proper size of filter without waste of filtering area and without chance of ch
14、anneling or leak around the filter.An inert metal screen or other mechanical support usually is required to prevent rupture or displacement of the filter in service.If the holder is not properly designed,flow through the medium will not be uniform over the face of the filter.Uniform flow distributio
15、n is especially desirable where par-ticle counts are to be made.Many kinds of filter media are available,and the one selected should best suit the purpose for which the particle collection is made.Properties of van-ous media have been published(2).5.1.1.2 Flow Meter-The flow meter may be of the orif
16、ice type,a rotameter,bellows gas meter,rotary gas meter,or other recognized device.In any case,it must be carefully calibrated under the conditions of use to give an accurate measure of sample volume or flow rate.5.1.1.3 Various types of air-moving equipment may be employed to draw the sample of air or gas through the system,the most usual being a turbine-type blower,mechan-ical vane pump,piston or diaphragm pump,or ejector.For large volumes and for long sampling periods,turbine blowers are most