ASTM D4765-13
(Test Method)Standard Test Method for Measurement of Fluorides in Workplace Atmospheres by Ion-Selective Electrodes
Standard Test Method for Measurement of Fluorides in Workplace Atmospheres by Ion-Selective Electrodes
SIGNIFICANCE AND USE
5.1 The capability of this test method to collect and quantitate both particulate and gaseous fluorides over the ranges normally encountered in industrial atmospheres makes it applicable for industrial hygiene evaluation and control purposes. The recommended range of this test method is from 0.005 to 5 mg F−/m 3 air.
SCOPE
1.1 This test method covers the simultaneous collection and separate measurements of gaseous fluoride (for example, hydrogen fluoride) and particulate fluoride found in certain industrial workplaces. The gaseous fluorides and particulate fluorides collected are reported in terms of fluoride. The method covers sample collection, preparation, and fluoride measurement.
1.2 The procedure is not applicable to the collection or analysis of gaseous fluoro compounds (for example, fluorocarbon or fluorosulfur compounds).
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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.
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Designation: D4765 − 13
Standard Test Method for
Measurement of Fluorides in Workplace Atmospheres by
1
Ion-Selective Electrodes
This standard is issued under the fixed designation D4765; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Test Method
1.1 This test method covers the simultaneous collection and 4.1 Particulate material from a measured volume of air is
separate measurements of gaseous fluoride (for example, collected by means of a membrane filter. Gaseous fluoride,
hydrogen fluoride) and particulate fluoride found in certain from the sample of air, is absorbed by an alkali-impregnated
industrial workplaces. The gaseous fluorides and particulate cellulose pad placed behind the membrane filter. The mem-
fluorides collected are reported in terms of fluoride. The brane filter and collected solids are made alkaline, ashed, and
method covers sample collection, preparation, and fluoride the residue fused with additional alkali. Finally, the fluoride is
measurement. determined in a solution of the melt by use of a fluoride
ion-selective electrode. Gaseous fluoride is determined in an
1.2 The procedure is not applicable to the collection or
aqueous extract of the cellulose pad, also by means of the
analysis of gaseous fluoro compounds (for example, fluorocar-
fluoride ion-selective electrode.
bon or fluorosulfur compounds).
1.3 The values stated in SI units are to be regarded as the
5. Significance and Use
standard.
5.1 The capability of this test method to collect and quan-
1.4 This standard does not purport to address all of the
titate both particulate and gaseous fluorides over the ranges
safety concerns, if any, associated with its use. It is the
normally encountered in industrial atmospheres makes it ap-
responsibility of the user of this standard to establish appro-
plicableforindustrialhygieneevaluationandcontrolpurposes.
priate safety and health practices and determine the applica-
The recommended range of this test method is from 0.005 to 5
− 3
bility of regulatory limitations prior to use.
mg F /m air.
2. Referenced Documents
6. Interferences
2
2.1 ASTM Standards:
6.1 Because an ion-selective electrode responds to ionic
D1193Specification for Reagent Water
activity, insoluble and complex forms of fluoride must be
D1356Terminology Relating to Sampling and Analysis of
released by appropriate combinations of fusion, adjustment of
Atmospheres
pH, and addition of complexing agents.
D4840Guide for Sample Chain-of-Custody Procedures
D5337Practice for Flow RateAdjustment of Personal Sam- 6.2 Filter Materials—Not all filter materials can be used
pling Pumps effectively for sampling particulate fluorides in workplace air.
E1370Guide for Air Sampling Strategies for Worker and Cellulosicmembranefiltersarethemostsuitablefiltertypesfor
Workplace Protection sampling of fluorides. Several manufacturers offer mixed-
cellulose ester filters commercially; nevertheless it is essential
3. Terminology
to check the quality of each filter batch used for sampling.
3.1 Definitions—For definitions of terms used in this test
6.3 Acidity (pH) and ionic strengths of fluoride standard
method, refer to Terminology D1356.
solutions must be matched to those of samples.
1
6.4 Temperature of sample and standard solutions must be
This test method is under the jurisdiction of ASTM Committee D22 on Air
Qualityand is the direct responsibility of Subcommittee D22.04 on WorkplaceAir
controlled within 62°C.
Quality.
Current edition approved April 1, 2013. Published April 2013. Originally
7. Apparatus
approved in 1988. Last previous edition approved in 2008 as D4765–03 (2008).
DOI: 10.1520/D4765-13.
7.1 Personal Sampling Pump, capable of maintaining con-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
stant air flow (65 %) in the range 1–5 L/min through a filter
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
holder(7.2)containinga0.8-µmporesizecellulosicmembrane
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. filter(7.3)andcellulosepad(7.4)foraperiodofupto8hours.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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---------------------- Page: 1 ----------------------
D4765 − 13
7.2 Filter Holder—For sampling of inhalable fraction of 8.7 Borate-Carbonate Fusion Mixture—Thoroughly mix a
aerosols, of suitable diameter for the filters (for example, 1+2 (w/w) combination of sodium tetraborate (Na B O ) and
2 4 7
37-mm; see 7.3). The holder shall be numbered for identifica- sodium c
...
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: D4765 − 03 (Reapproved 2008) D4765 − 13
Standard Test Method for
Measurement of Fluorides in Workplace Atmospheres by
1
Ion-Selective Electrodes
This standard is issued under the fixed designation D4765; 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 test method covers the simultaneous collection and separate measurements of gaseous fluoride (for example, hydrogen
fluoride) and particulate fluoride found in certain industrial workplaces. The gaseous inorganic fluorides fluorides and particulate
fluorides collected are reported in terms of fluoride; the procedure is not applicable to the collection or analysis of other
fluoride-bearing gases (for example, fluorocarbon or fluorosulfur compounds). This test fluoride. The method covers sample
collection, preparation, and fluoride measurement.
1.2 The procedure is not applicable to the collection or analysis of gaseous fluoro compounds (for example, fluorocarbon or
fluorosulfur compounds).
1.3 The values stated in SI units are to be regarded as the standard.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
D1357D4840 Practice for Planning the Sampling of the Ambient AtmosphereGuide for Sample Chain-of-Custody Procedures
D5337 Practice for Flow Rate Adjustment of Personal Sampling Pumps
E1370 Guide for Air Sampling Strategies for Worker and Workplace Protection
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology D1356.
4. Summary of Test Method
4.1 Particulate material from a measured volume of air is collected by means of a membrane filter. Gaseous fluoride, from the
sample of air, is absorbed by an alkali-impregnated cellulose pad placed immediately behind the membrane filter. The membrane
filter and collected solids are made alkaline, ashed, and the residue fused with additional alkali. Finally, the fluoride is determined
in a solution of the melt by use of a fluoride ion-selective electrode. Gaseous fluoride is determined in an aqueous extract of the
cellulose pad, also by means of the fluoride ion-selective electrode.
5. Significance and Use
5.1 The capability of this test method to collect and quantitate both particulate and gaseous fluorides over the ranges normally
encountered in industrial atmospheres makes it applicable for industrial hygiene evaluation and control purposes. The
− 3
recommended range of this test method is from 0.005 to 5 mg F /m air.
1
This test method is under the jurisdiction of ASTM Committee D22 on Air Qualityand and is the direct responsibility of Subcommittee D22.04 on on Workplace Air
Quality.
Current edition approved April 1, 2008April 1, 2013. Published July 2008April 2013. Originally approved in 1988. Last previous edition approved in 20032008 as
D4765 – 03.D4765 – 03(2008). DOI: 10.1520/D4765-03R08.10.1520/D4765-13.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D4765 − 13
6. Interferences
6.1 Because an ion-selective electrode responds to ionic activity, insoluble and complex forms of fluoride must be released by
appropriate combinations of fusion, adjustment of pH, and addition of complexing agents.
6.2 Filter Materials—Not all filter materials can be used effectively for sampling particulate fluorides in workplace air.
Cellulosic membrane filters are the most suitable filter types for sampling of fluorides. Several manufacturers offer mixed-cellulose
ester filters commercially; nevertheless it is essential to check the quality of each filter batch used for sampling.
6.3 Acidity (pH) and ionic strengths of fluoride standard solutions must be match
...
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