ASTM D7144-05a(2016)

Standard Practice for Collection of Surface Dust by Micro-vacuum Sampling for Subsequent Metals Determination

SIGNIFICANCE AND USE
5.1 Human exposure to toxic metals present in surface dust can result from dermal contact with or ingestion of contaminated dust. Also, inhalation exposure can result from disturbing dust particles from contaminated surfaces. Thus, standardized methods for the collection and analysis of metals in surface dust samples are needed in order to evaluate the potential for human exposure to toxic elements.  
5.2 This practice involves the use of sampling equipment to collect surface dust samples that may contain toxic metals, and is intended for use by qualified technical professionals.  
5.3 This practice allows for the subsequent determination of collected metals concentrations on an area (loading) or mass concentration basis, or both.  
5.4 Because particle losses can occur due to collection of dust onto the inner surfaces of the nozzle, the length of the collection nozzle is specified in order that such losses are comparable from one sample to another.  
5.5 This practice is suitable for the collection of surface dust samples from, for example: (a) soft, porous surfaces such as carpet or upholstery; (b) hard, rough surfaces such as concrete or roughened wood; (c) confined areas that cannot be easily sampled by other means (such as wipe sampling as described in Practice D6966). A companion sampling technique that may be used for collection of surface dust from hard, smooth surfaces is wipe sampling (Practice D6966). A companion vacuum sampling technique that may be used for sampling carpets is described in Practice D5438.  
5.6 Procedures presented in this practice are intended to provide a standardized method for dust collection from surfaces that cannot be reliably sampled using wipe collection methods (for example, Practice D6966). Additionally, the procedure described uses equipment that is readily available and in common use for other environmental and occupational hygiene sampling applications.  
5.7 The entire contents of the filter holder, that is, the fil...
SCOPE
1.1 This practice covers the micro-vacuum collection of surface dust for subsequent determination of metals. The primary intended application is for sampling from soft, rough, or porous surfaces.  
1.2 Micro-vacuum sampling is carried out using a collection nozzle attached to a filter holder (sampling cassette) that is connected to an air sampling pump.  
1.3 This practice allows for the subsequent determination of metals on a loading basis (mass of metal(s) per unit area sampled), or on a concentration basis (mass of metal(s) per unit mass of sample collected), or both.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 Limitations—Due to a number of physical factors inherent in the micro-vacuum sampling method, analytical results for vacuum dust samples are not likely to reflect the total dust contained within the sampling area prior to sample collection. Indeed, dust collection will generally be biased towards smaller, less dense dust particles. Nevertheless, the use of this standard practice will generate data that are consistent and comparable between operators performing micro-vacuum collection at a variety of sampling locations and sites.2  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 30-Sep-2016
• ICS: 71.040.99 - Other standards related to analytical chemistry
• Technical Committee: D22 - Air Quality
• Drafting Committee: D22.04 - Workplace Air Quality

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7144 − 05a (Reapproved 2016)
Standard Practice for
Collection of Surface Dust by Micro-vacuum Sampling for
Subsequent Metals Determination
This standard is issued under the fixed designation D7144; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This practice covers the micro-vacuum collection of
2.1 ASTM Standards:
surface dust for subsequent determination of metals. The
D1356 Terminology Relating to Sampling and Analysis of
primary intended application is for sampling from soft, rough,
Atmospheres
or porous surfaces.
D3195 Practice for Rotameter Calibration
D4840 Guide for Sample Chain-of-Custody Procedures
1.2 Micro-vacuumsamplingiscarriedoutusingacollection
D5438 Practice for Collection of Floor Dust for Chemical
nozzle attached to a filter holder (sampling cassette) that is
Analysis
connected to an air sampling pump.
D6966 Practice for Collection of Settled Dust Samples
1.3 This practice allows for the subsequent determination of
Using Wipe Sampling Methods for Subsequent Determi-
metals on a loading basis (mass of metal(s) per unit area
nation of Metals
sampled),oronaconcentrationbasis(massofmetal(s)perunit
2.2 ISO Standard:
mass of sample collected), or both.
ISO 15202-1 Workplace air—Determination of metals and
1.4 The values stated in SI units are to be regarded as
metalloids in airborne particulate matter by inductively
standard. No other units of measurement are included in this
coupled plasma atomic emission spectrometry—Part 1:
standard.
Sampling
1.5 Limitations—Due to a number of physical factors inher-
ent in the micro-vacuum sampling method, analytical results
for vacuum dust samples are not likely to reflect the total dust
3. Terminology
contained within the sampling area prior to sample collection.
3.1 Definitions—For definitions of terms relating to sam-
Indeed, dust collection will generally be biased towards
pling and analysis of dust not given here, refer to Terminology
smaller, less dense dust particles. Nevertheless, the use of this
D1356.
standard practice will generate data that are consistent and
comparable between operators performing micro-vacuum col- 3.2 Definitions of Terms Specific to This Standard:
lection at a variety of sampling locations and sites.
3.2.1 air sampling pump—a portable pump that is used to
draw air through a filter holder/collection nozzle assembly for
1.6 This standard does not purport to address all of the
micro-vacuum collection of surface dust. An example would
safety concerns, if any, associated with its use. It is the
include a personal sampling pump. D1356
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3.2.2 batch—a group of field or quality control samples, or
bility of regulatory limitations prior to use.
both, that are collected together in a similar environment and
are processed together using the same reagents and equipment.
3.2.3 collection nozzle—apieceofflexibleplastictubingcut
at a 45º angle at the inlet end, and connected at the outlet end
to the inlet orifice of a filter holder (sampling cassette).
This practice is under the jurisdiction ofASTM Committee D22 on Air Quality
and is the direct responsibility of Subcommittee D22.04 on WorkplaceAir Quality.
Current edition approved Oct. 1, 2016. Published October 2016. Originally For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved in 2005. Last previous edition approved in 2011 as D7144 – 05a (2011). contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
DOI: 10.1520/D7144-05AR16. Standards volume information, refer to the standard’s Document Summary page on
Reynolds, S. J., et al.,“Laboratory Comparison of Vacuum, OSHA, and HUD the ASTM website.
Sampling Methods for Lead in Household Dust,” American Industrial Hygiene Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Association Journal, Vol. 58, 1997, pp. 439–446. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7144 − 05a (2016)
3.2.4 field blank—a sample that is handled in exactly the
same way that field samples are collected, except that no air is
drawn through it.
3.2.5 filter holder—an apparatus that supports and contains
the filter medium upon which dust is collected. It is also often
referred to as a sampling cassette.
3.2.6 internal capsule—a device inserted into a filter holder
A: Flexible tubing connecting the filter holder to the sampling pump (not shown);
(sampling cassette) that allows complete capture of contami-
B: Outlet of filter holder;
nant within its envelope and prevents deposition of collected
C: Back-up pad/support;
material on the internal walls of the sampling cassette. Use of
D: Filter;
E: Inlet of filter holder;
an internal capsule is necessary for gravimetric analysis
F: Housing of filter holder;
purposes.
G: Flexible tubing collection nozzle.
3.2.6.1 Discussion—Such capsules are commercially avail-
able. FIG. 1 Schematic of Sampling Assembly for Micro-Vacuum Sur-
face Dust Sampling
3.2.7 sampling device (assembly)—for micro-vacuum
sampling, an apparatus consisting of the collection nozzle,
filter holder (containing internal capsule, if necessary), and air
5.3 This practice allows for the subsequent determination of
sampling pump, used to collect surface dust. The collection
collected metals concentrations on an area (loading) or mass
nozzle is attached to the inlet end of the filter holder. The filter
concentration basis, or both.
holderhousesthefilter,throughwhichairisdrawnbyusingthe
5.4 Because particle losses can occur due to collection of
air sampling pump.The filter holder is attached to the pump by
dust onto the inner surfaces of the nozzle, the length of the
flexible tubing.
collection nozzle is specified in order that such losses are
3.2.8 surface dust—particulate matter on a given surface
comparable from one sample to another.
which has been transported to its present location by various
5.5 Thispracticeissuitableforthecollectionofsurfacedust
means, such as settling through the air or tracking from other
samples from, for example: (a) soft, porous surfaces such as
sources.
carpet or upholstery; (b) hard, rough surfaces such as concrete
4. Summary of Practice
or roughened wood; (c) confined areas that cannot be easily
sampled by other means (such as wipe sampling as described
4.1 Samples of surface dust are collected from selected
in Practice D6966).Acompanion sampling technique that may
sampling locations into individual filter holders by using a
be used for collection of surface dust from hard, smooth
micro-vacuum collection technique that employs a personal
surfaces is wipe sampling (Practice D6966). A companion
sampling pump. The sample is then processed for transport
vacuum sampling technique that may be used for sampling
and subsequent laboratory analysis for determination of metals
carpets is described in Practice D5438.
content.
5.6 Procedures presented in this practice are intended to
4.2 The collected sample may include particles which ad-
provide a standardized method for dust collection from sur-
here to the internal walls of the filter holder. This material
faces that cannot be reliably sampled using wipe collection
should be rinsed or wiped off and added to the sample meant
methods (for example, Practice D6966). Additionally, the
for subsequent chemical analysis. However, this material
procedure described uses equipment that is readily available
cannot be included in gravimetric determination unless an
and in common use for other environmental and occupational
internal capsule that can be accurately weighed is used during
hygiene sampling applications.
sample collection.
5.7 The entire contents of the filter holder, that is, the filter
5. Significance and Use
plus collected dust, is targeted for subsequent analysis for
5.1 Human exposure to toxic metals present in surface dust
metals content. An internal capsule is used if gravimetric
can result from dermal contact with or ingestion of contami-
analysis is necessary.
nateddust.Also,inhalationexposurecanresultfromdisturbing
6. Apparatus
dust particles from contaminated surfaces. Thus, standardized
methods for the collection and analysis of metals in surface
6.1 Dust Sampling Equipment—The sampling assembly
dust samples are needed in order to evaluate the potential for
(see Fig. 1) for the micro-vacuum collection of surface dust
human exposure to toxic elements.
samples has the following components:
5.2 This practice involves the use of sampling equipment to 6.1.1 Filters, of a diameter suitable for use with the filter
collect surface dust samples that may contain toxic metals, and holders,andwithacollectionefficiencyofnotlessthan99.5 %
is intended for use by qualified technical professionals. for particles with a diffusion diameter of 0.3 µm, and with a
verylowmetalcontent(typicallylessthan0.1µgofeachmetal
of interest per filter) (see ISO 15202-1).
Que Hee, S. S., et al., “Evolution of Efficient Methods to Sample Lead Sources,
6.1.1.1 Weight-stable filters or matched-weight filters shall
Such as House Dust and Hand Dust, in the Homes of Children.” Environmental
Research, Vol. 38, 1985, pp. 77–95. be used if it is desired to determine the mass of collected dust.
D7144 − 05a (2016)
NOTE 1—If the filters are to be weighed in order to determine the mass
7. Procedure
of dust collected, it is important that they be resistant to moisture
7.1 Assembly of Micro-Vacuum Sampling Device—The fol-
retention, so that blank weight changes that can occur as a result of
changes in temperature and humidity are as low and repeatable as lowing shall be carried out in an uncontaminated area while
possible. Also, filters selected for weight stability should not be exces-
wearing clean gloves:
sively brittle, since this can introduce weighing errors due to loss of filter
7.1.1 Assemble the filter in the filter holder, with the filter
material.
supported on a back-up pad or metallic screen. To prevent
6.1.2 Filter holders, for 25- or 37-mm diameter filters.
contamination, the filter should be handled only with tweezers.
6.1.3 Internal capsules, for gravimetric analysis—If it is
7.1.2 If pre-weighed filters and internal capsules are used,
desired to determine the mass of collected dust, internal
record their masses to the nearest 0.1 mg using establis
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7144 − 05a (Reapproved 2011) D7144 − 05a (Reapproved 2016)
Standard Practice for
Collection of Surface Dust by Micro-vacuum Sampling for
Subsequent Metals Determination
This standard is issued under the fixed designation D7144; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers the micro-vacuum collection of surface dust for subsequent determination of metals. The primary
intended application is for sampling from soft, rough, or porous surfaces.
1.2 Micro-vacuum sampling is carried out using a collection nozzle attached to a filter holder (sampling cassette) that is
connected to an air sampling pump.
1.3 This practice allows for the subsequent determination of metals on a loading basis (mass of metal(s) per unit area sampled),
or on a concentration basis (mass of metal(s) per unit mass of sample collected), or both.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 Limitations—Due to a number of physical factors inherent in the micro-vacuum sampling method, analytical results for
vacuum dust samples are not likely to reflect the total dust contained within the sampling area prior to sample collection. Indeed,
dust collection will generally be biased towards smaller, less dense dust particles. Nevertheless, the use of this standard practice
will generate data that are consistent and comparable between operators performing micro-vacuum collection at a variety of
sampling locations and sites.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
This practice is under the jurisdiction of ASTM Committee D22 on Air Quality and is the direct responsibility of Subcommittee D22.04 on Workplace Air Quality.
Current edition approved March 1, 2011Oct. 1, 2016. Published March 2011October 2016. Originally approved in 2005. Last previous edition approved in 20052011 as
D7144 – 05a.D7144 – 05a (2011). DOI: 10.1520/D7144-05AR11.10.1520/D7144-05AR16.
Reynolds, S. J., et al., “Laboratory comparison of vacuum, OSHA, and HUD sampling methods for lead in household dust.” American Industrial Hygiene Association
Journal, Vol. 58, pp. 439-446 (1997).Reynolds, S. J., et al.,“Laboratory Comparison of Vacuum, OSHA, and HUD Sampling Methods for Lead in Household Dust,” American
Industrial Hygiene Association Journal, Vol. 58, 1997, pp. 439–446.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7144 − 05a (2016)
2. Referenced Documents
2.1 ASTM Standards:
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
D3195 Practice for Rotameter Calibration
D4840 Guide for Sample Chain-of-Custody Procedures
D5438 Practice for Collection of Floor Dust for Chemical Analysis
D6966 Practice for Collection of Settled Dust Samples Using Wipe Sampling Methods for Subsequent Determination of Metals
2.2 ISO Standard:
ISO 15202-1 Workplace air—Determination of metals and metalloids in airborne particulate matter by inductively coupled
plasma atomic emission spectrometry—Part 1: Sampling
3. Terminology
3.1 Definitions—For definitions of terms relating to sampling and analysis of dust not given here, refer to Terminology D1356.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 air sampling pump—a portable pump that is used to draw air through a filter holder/collection nozzle assembly for
micro-vacuum collection of surface dust. An example would include a personal sampling pump (pump.D1356). D1356
3.2.2 batch—a group of field or quality control samples, or both, that are collected together in a similar environment and are
processed together using the same reagents and equipment.
3.2.3 collection nozzle—a piece of flexible plastic tubing cut at a 45º angle at the inlet end, and connected at the outlet end to
the inlet orifice of a filter holder (sampling cassette).
3.2.4 field blank—a sample that is handled in exactly the same way that field samples are collected, except that no air is drawn
through it.
3.2.5 filter holder—an apparatus that supports and contains the filter medium upon which dust is collected. It is also often
referred to as a sampling cassette.
3.2.6 internal capsule—a device inserted into a filter holder (sampling cassette) that allows complete capture of contaminant
within its envelope and prevents deposition of collected material on the internal walls of the sampling cassette. Use of an internal
capsule is necessary for gravimetric analysis purposes.
NOTE 1—Such capsules are commercially available.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
3.2.6.1 Discussion—
Such capsules are commercially available.
3.2.7 sampling device (assembly)—for micro-vacuum sampling, an apparatus consisting of the collection nozzle, filter holder
(containing internal capsule, if necessary), and air sampling pump, used to collect surface dust. The collection nozzle is attached
to the inlet end of the filter holder. The filter holder houses the filter, through which air is drawn by using the air sampling pump.
The filter holder is attached to the pump by flexible tubing.
3.2.8 surface dust—particulate matter on a given surface which has been transported to its present location by various means,
such as settling through the air or tracking from other sources.
4. Summary of Practice
4.1 Samples of surface dust are collected from selected sampling locations into individual filter holders by using a
micro-vacuum collection technique that employs a personal sampling pump. The sample is then processed for transport and
subsequent laboratory analysis for determination of metals content.
4.2 The collected sample may include particles which adhere to the internal walls of the filter holder. This material should be
rinsed or wiped off and added to the sample meant for subsequent chemical analysis. However, this material cannot be included
in gravimetric determination unless an internal capsule that can be accurately weighed is used during sample collection.
Que Hee, S. S., et al., “Evolution of efficient methods to sample lead sources, such as house dust and hand dust, in the homes of children.” Environmental Research,
Vol. 38, pp. 77-95 (1985).Que Hee, S. S., et al., “Evolution of Efficient Methods to Sample Lead Sources, Such as House Dust and Hand Dust, in the Homes of Children.”
Environmental Research, Vol. 38, 1985, pp. 77–95.
D7144 − 05a (2016)
A: Flexible tubing connecting the filter holder to the sampling pump (not shown);
B: Outlet of filter holder;
C: Back-up pad/support;
D: Filter;
E: Inlet of filter holder;
F: Housing of filter holder;
G: Flexible tubing collection nozzle.
FIG. 1 Schematic of Sampling Assembly for Micro-Vacuum Surface Dust Sampling
A: Flexible tubing connecting the filter holder to the sampling pump (not shown); B: Outlet of filter holder; C: Back-up pad/support; D:
Filter; E: Inlet of filter holder; F: Housing of filter holder; G: Flexible tubing collection nozzle
5. Significance and Use
5.1 Human exposure to toxic metals present in surface dust can result from dermal contact with or ingestion of contaminated
dust. Also, inhalation exposure can result from disturbing dust particles from contaminated surfaces. Thus, standardized methods
for the collection and analysis of metals in surface dust samples are needed in order to evaluate the potential for human exposure
to toxic elements.
5.2 This practice involves the use of sampling equipment to collect surface dust samples that may contain toxic metals, and is
intended for use by qualified technical professionals.
5.3 This practice allows for the subsequent determination of collected metals concentrations on an area (loading) or mass
concentration basis, or both.
5.4 Because particle losses can occur due to collection of dust onto the inner surfaces of the nozzle, the length of the collection
nozzle is specified in order that such losses are comparable from one sample to another.
5.5 This practice is suitable for the collection of surface dust samples from, for example: (a) soft, porous surfaces such as carpet
or upholstery; (b) hard, rough surfaces such as concrete or roughened wood; (c) confined areas that cannot be easily sampled by
other means (such as wipe sampling as described in Practice D6966). A companion sampling technique that may be used for
collection of surface dust from hard, smooth surfaces is wipe sampling (Practice D6966). A companion vacuum sampling technique
that may be used for sampling carpets is described in Practice D5438.
5.6 Procedures presented in this practice are intended to provide a standardized method for dust collection from surfaces that
cannot be reliably sampled using wipe collection methods (for example, Practice D6966). Additionally, the procedure described
uses equipment that is readily available and in common use for other environmental and occupational hygiene sampling
applications.
5.7 The entire contents of the filter holder, that is, the filter plus collected dust, is targeted for subsequent analysis for metals
content. An internal capsule is used if gravimetric analysis is necessary.
6. Apparatus
6.1 Dust sampling equipment—Sampling Equipment—The sampling assembly (see Fig. 1) for the micro-vacuum collection of
surface dust samples has the following components:
6.1.1 Filters, of a diameter suitable for use with the filter holders, and with a collection efficiency of not less than 99.5 % for
particles with a diffusion diameter of 0.3 μm, and with a very low metal content (typically less than 0.1 μg of each metal of interest
per filter) (see ISO 15202-1).
6.1.1.1 Weight-stable filters or matched-weight filters shall be used if it is desired to determine the mass of collected dust.
NOTE 1—If the filters are to be weighed in order to determine the mass of dust collected, it is important that they be resistant to moisture retention,
so that blank weight changes that can occur as a result of changes in temperature and humidity are as low and repeatable as possible. Also, filters selected
for weight stability should not be excessively brittle, since this can introduce weighing errors due to loss of filter material.
6.1.2 Filter holders, for 25- or 37-mm diameter filters.
6.1.3 Internal capsules, for gravimetric analysis—If it is desired to determine the mass of collected dust, internal capsules shall
be weighed to the nearest 0.1 mg.
NOTE 2—If pre-weighed internal capsules and filters are used, it will be necessary to tare the internal capsules, plus backup pads, prior to use.
D7144 − 05a (2016)
Procedures for accurate weighing of internal capsules are described in detail elsewhere.
6.1.4 Back-up pads, cellulosic; or metallic screen back-up support.
NOTE 3—If pre-weighed filters are used, it is not necessary to know the mass of each back-up pad. However, if pre-weighed internal capsules and
pre-weighed filters are used, it will be necessary to know the influence of the mass of each back-up pad on the overall mass of the entire sampling
assembly (to the nearest 0.1 mg).
6.1.5 Collection nozzle, consisting of a piece of flexible polyvinyl chloride (PVC) tubing of length 5.5 6 0.5 cm and
0.60 6 0.005 cm inside diameter, cut at a 45° angle at the inlet end.
6.1.6 Tubing, flexible, inside diameter 0.60 6 0.005 cm for connecting the sampling device to the air sampling pump (maximum
length 1 m).
6.1.7 Air sampling pump, portable, capable of sampling at a flow rate of 2.5 6 0.5 L ⁄min. The pump shall be calibrated with
a representative sampling assembly in line so that the volume of air sampled can be measured to an accuracy of 65 % or better.
6.1.8 Calibration device, for air sampling pumps; soap bubble meter or equivalent, as specified in Practice D3195.
6.1.9 Rotameter, calibrated, as specified in Practice D3195.
6.1.10 Sampling templates, minimum dimensions 10 cm by 10 cm, maximum dimensions 30 cm by 30 cm; reusable metallic
or plastic; or disposable plastic or cardboard.
6.1.11 Gloves, powderless, latex-free, for handling of filters, back-up pads/supports, samplers, tubing, collection nozzles, and
other sample collection components.
6.1.12 Tape, adhesive, for immobilization of sampling templates; and for delineation of sampling areas where the use of
templates is impractical.
6.1.13 Tape measure or ruler, metric, for measurement of sampling areas when the use of templates is impractical, and for
measurement of tubing, collection nozzles, and so forth.
6.1.14 Tweezers, plastic or plastic-tipped metallic, for handling of filters.
6.1.15 Sealable plastic bags, or boxes, or other airtight containers, or a combination of the three, for transporting collected
samples.
7. Procedure
7.1 Assembly of micro-vacuum sampling device—Micro-Vacuum Sampling Device—The following shall be carried out in an
uncontaminated area while wearing clean gloves:
7.1.1 Assemble the filter in the filter holder, with the filter supported on a back-up pad or metallic screen. To prevent
contamination, the filter should be handled only with tweezers.
7.1.2 If pre-weighed filters and internal capsules are used, record their masses to the nearest 0.1 mg using established acceptance
criteria.
NOTE 4—If desired, pre-loaded filter holders and capsules with pre-weighed filters and internal capsules may be purchased, already assembled, from
the manufacturer.
7.1.3 Close and seal the sampling device to prevent leakage of air around the filter or into/out of the sampler. Label the sampler
with a unique sample identifier.
7.1.4 Attach the outlet end of the collection nozzle to the inlet end of the filter holder, and secure tightly
...