ASTM D6966-18

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Designation: D6966 − 13 D6966 − 18
Standard Practice for
Collection of Settled Dust Samples Using Wipe Sampling
Methods for Subsequent Determination of Metals
This standard is issued under the fixed designation D6966; 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 collection of settled dust on surfaces using the wipe sampling method. These samples are collected
in a manner that will permit subsequent extraction and determination of target metals in the wipes using laboratory analysis
techniques such as atomic spectrometry.
1.2 This practice does not address the sampling design criteria (that is, sampling plan which includes the number and location
of samples) that are used for clearance, hazard evaluation, risk assessment, and other purposes. To provide for valid conclusions,
sufficient numbers of samples should be obtained as directed by a sampling plan, for example, in accordance with Guide D7659.
1.3 This practice contains notes that are explanatory and are not part of the mandatory requirements of this practice.
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 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
D4840 Guide for Sample Chain-of-Custody Procedures
D7144 Practice for Collection of Surface Dust by Micro-vacuum Sampling for Subsequent Metals Determination
D7659 Guide for Strategies for Surface Sampling of Metals and Metalloids for Worker Protection
D7707 Specification for Wipe Sampling Materials for Beryllium in Surface Dust
E1792 Specification for Wipe Sampling Materials for Lead in Surface Dust
3. Terminology
3.1 For definitions of terms not listed here, see Terminology D1356.
3.2 Definitions:
3.2.1 batch, n—a group of field or quality control (QC) samples that are collected or processed together at the same time using
the same reagents and equipment.
3.2.2 sampling location, n—a specific area within a sampling site that is subjected to sample collection.
3.2.2.1 Discussion—
Multiple sampling locations are commonly designated for a single sampling site (see 3.2.3).
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 April 1, 2013Nov. 1, 2018. Published April 2013November 2018. Originally approved in 2003. Last previous edition approved in 20082013 as
D6966 – 08.D6966 – 13. DOI: 10.1520/D6966-13.10.1520/D6966-18.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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D6966 − 18
3.2.3 sampling site, n—a local geographic area that contains the sampling locations (see 3.2.2).
3.2.3.1 Discussion—
A sampling site is generally limited to an area that is easily covered by walking.
3.2.2 wipe, n—a disposable towellette that is moistened with a wetting agent. E1792
3.2.2.1 Discussion—
These towellettes are used to collect samples of settled dust on surfaces for subsequent determination of metals content in the
collected dust.
3.3 Definitions of Terms Specific to This Standard:
3.3.1 field blank, n—a wipe (see 3.2.43.2.2) that is exposed to the same handling as field samples except that no sample is
collected (no surface is actually wiped).
3.3.1.1 Discussion—
Analysis results from field blanks provide information on the analyte background level in the wipe, combined with the potential
contamination experienced by samples collected within the batch (see 3.2.1) resulting from handling.
4. Summary of Practice
4.1 Wipe samples of settled dust are collected on surfaces from areas of known dimensions with wipes satisfying certain
requirements, using a specified pattern of wiping.
4.2 The collected wipes are then ready for subsequent sample preparation and analysis for the measurement of metals of interest.
5. Significance and Use
5.1 This practice is intended for the collection of settled dust samples for the subsequent measurement of target metals. The
practice is meant for use in the collection of settled dust samples that are of interest in clearance, hazard evaluation, risk
assessment, and other purposes.
5.2 This practice is recommended for the collection of settled dust samples from hard, relatively smooth nonporous surfaces.
This practice is less effective for collecting settled dust samples from surfaces with substantial texture such as rough concrete,
brickwork, textured ceilings, and soft fibrous surfaces such as upholstery and carpeting. Micro-vacuum sampling using Practice
D7144 may be more suitable for these surfaces. Collection efficiency for metals such as lead from smooth, hard surfaces has been
found to exceed 75 % ((Specification E1792).
6. Apparatus and Materials
6.1 Sampling Templates—One or more of the following: 10 cm by 10 cm (minimum dimensions) reusable or disposable
aluminum or plastic template(s), or disposable cardboard templates, (full-square, rectangular, square “U-shaped,” rectangular
“U-shaped,” or “L-shaped,” or both); or templates of alternative areas having accurately known dimensions (see Note 1).
Templates shall be capable of lying flat on a surface.
NOTE 1—For most surfaces, it is recommended to collect settled dust from a minimum surface area of 100 cm to provide sufficient material for
subsequent laboratory analysis. However, larger areas (for example, 30 cm by 30 cm) may be appropriate for surfaces having little or no visible settled
dust, while a smaller sampling area (for example, 10 cm by 10 cm) may be appropriate for surfaces with high levels of visible settled dust. It is
recommended to have a suite of templates with various sampling dimensions.
6.2 Wipes, for collection of settled dust samples from surfaces. Wipes shall be individually wrapped and fully wetted. The
background metal(s) content of the wipes should be as low as possible. At a maximum, the background level of target metal(s)
shall be no more than one-tenth the target concentration the metal(s) to be measured.
NOTE 2—Wipes meeting the requirements of Specifications E1792 or D7707, or both, may be suitable.
NOTE 3—Wipes made of cellulosic materials may produce fewer analysis problems than wipes made of synthetic polymeric materials.
6.3 Sample Containers,containers, sealable, rigid-walled, 30-mL minimum volume.
NOTE 4—Screw-top plastic centrifuge tubes are an example of a suitable rigid-walled sample container.
NOTE 5—Use of a sealable plastic bag for holding and transporting the settled dust wipe sample is not recommended due to the potential loss of
collected dust within the plastic bag during transportation and laboratory handling. Quantitative removal and processing of the settled dust wipe sample
by the laboratory is significantly improved through the use of sealable rigid-walled containers.
6.4 Measuring Tool,tool, tape or ruler, capable of measuring to the nearest 60.1 cm.
6.5 Plastic Gloves,gloves, powderless.
D6966 − 18
6.6 Cleaning Cloths,cloths, for cleaning of templates and other equipment.
NOTE 6—Wipes used for dust sampling (6.2) can be used for cleaning templates and other sampling equipment, but other cleaning cloths or wipes not
meeting the requirements described in (6.2) may be suitable for this purpose.
6.7 Adhesive Tape,tape, suitable for securing the template(s) to the surface(s) to be sampled, and for demarcating sampling areas
if templates are not used.
NOTE 7—Masking tape, for example, functions well for these purposes.
6.8 Disposable Shoe Covers,shoe covers, optional.
7. Procedure
7.1 Use one of the following two options when collecting settled dust samples from each sampl
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