ASTM D2420-12a
(Test Method)Standard Test Method for Hydrogen Sulfide in Liquefied Petroleum (LP) Gases (Lead Acetate Method)
Standard Test Method for Hydrogen Sulfide in Liquefied Petroleum (LP) Gases (Lead Acetate Method)
SIGNIFICANCE AND USE
4.1 Liquefied petroleum gases and their products of combustion must not be unduly corrosive to the materials with which they come in contact. The potential personnel exposure hazards of H2S also make the detection and measurement of hydrogen sulfide important, even in low concentrations. In addition, in some cases the odor of the gases shall not be objectionable. (See Specification D1835 and GPA 2140.)
SCOPE
1.1 This test method2 covers the detection of hydrogen sulfide in liquefied petroleum (LP) gases. The sensitivity of the test is about 4 mg/m3 (0.15 to 0.2 grain of hydrogen sulfide per 100 ft3) of gas.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3 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:D2420 −12a
StandardTest Method for
Hydrogen Sulfide in Liquefied Petroleum (LP) Gases (Lead
1
Acetate Method)
This standard is issued under the fixed designation D2420; 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* paper varying from yellow to black, depending upon the
2 amount of hydrogen sulfide present.
1.1 This test method covers the detection of hydrogen
sulfide in liquefied petroleum (LP) gases.The sensitivity of the
4. Significance and Use
3
test is about 4 mg/m (0.15 to 0.2 grain of hydrogen sulfide per
3
4.1 Liquefied petroleum gases and their products of com-
100 ft ) of gas.
bustion must not be unduly corrosive to the materials with
1.2 The values stated in SI units are to be regarded as
which they come in contact. The potential personnel exposure
standard. The values given in parentheses are for information
hazards of H S also make the detection and measurement of
2
only.
hydrogen sulfide important, even in low concentrations. In
1.3 This standard does not purport to address all of the
addition, in some cases the odor of the gases shall not be
safety concerns, if any, associated with its use. It is the
objectionable. (See Specification D1835 and GPA 2140.)
responsibility of the user of this standard to establish appro-
5. Interferences
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.1 Methyl mercaptan, if present, produces a transitory
yellow stain on the lead acetate paper that will fade completely
2. Referenced Documents
in less than 5 min.
3
2.1 ASTM Standards:
5.2 Other sulfur compounds present in liquefied petroleum
D1193 Specification for Reagent Water
gas do not interfere with the test.
D1265 Practice for Sampling Liquefied Petroleum (LP)
Gases, Manual Method
6. Apparatus and Materials
D1835 Specification for Liquefied Petroleum (LP) Gases
6.1 Apparatus for Detecting Hydrogen Sulfide in Liquefied
4
2.2 GPA Standard:
Petroleum Gas, as shown in Fig. 1 or commercially available
GPA2140 Liquefied Petroleum Gas Specifications and Test
apparatus.
Methods
6.2 Lead Acetate Test Paper—Commercially available test
paper is satisfactory. Alternatively, the test paper may be
3. Summary of Test Method
prepared by dipping strips of smooth filter paper in 5 %
3.1 VaporizedLPgasispassedovermoistleadacetatepaper
aqueous lead acetate solution and removing the excess solution
under controlled conditions. Hydrogen sulfide reacts with lead
with a clean blotter. The strips of paper shall be approximately
acetate to form lead sulfide which produces a coloration on the
50mmlongand10mmwideandcontaina3mmholenearone
end so they will hang freely vertical in the test apparatus.
1
This test method is under the jurisdiction of ASTM Committee D02 on
6.3 Gas Flow Indicator—Capable of measuring flow rates
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
in the range of 2 to 3 L of gas per minute. A wet test meter
D02.H0 on Liquefied Petroleum Gas.
rotameter and mass flow controller have been found to be
Current edition approved Nov. 1, 2012. Published February 2013. Originally
approved in 1965. Last previous edition approved in 2012 as D2420–12. DOI:
suitable.
10.1520/D2420-12A.
2
6.4 Water—Unless otherwise indicated, reference to water
This test method is based on Edwards, J. D., and McBride, R. S., “LeadAcetate
Test for Hydrogen Sulphide in Gas,” Technologic Papers T41, National Institute for
shall be understood to mean reagent water that meets the
Standards and Technology, Aug. 9, 1914.
requirements ofType II or III of Specification D1193, or better.
3
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
6.5 Tubing—High–pressure connecting tubing to connect
Standards volume information, refer to the standard’s Document Summary page on
the test apparatus to the sample collection point. Internally
the ASTM website.
4
clean, non-reactive and non-absorptive stainless steel material
Available from Gas ProcessorsAssociation (GPA), 6526 E. 60th St., Tulsa, OK
74145, www.gpaglobal.org. is recommended, but other materials that safely contain the
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D2420−12a
FIG. 1Typical Apparatus for Detecting Hydrogen Sulfide in Liquefied Petroleum Gas
pressure, resist being cut or torn, and have been tested to be l
...
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: D2420 − 12 D2420 − 12a
Standard Test Method for
Hydrogen Sulfide in Liquefied Petroleum (LP) Gases (Lead
1
Acetate Method)
This standard is issued under the fixed designation D2420; 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
1.1 This test method covers the detection of hydrogen sulfide in liquefied petroleum (LP) gases. The sensitivity of the test is
3 3
about 4 mg/m (0.15 to 0.2 grain of hydrogen sulfide per 100 ft ) of gas.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.3 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
3
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D1265 Practice for Sampling Liquefied Petroleum (LP) Gases, Manual Method
D1835 Specification for Liquefied Petroleum (LP) Gases
4
2.2 GPA Standard:
GPA 2140 Liquefied Petroleum Gas Specifications and Test Methods
3. Summary of Test Method
3.1 The vaporized Vaporized LP gas is passed over moist lead acetate paper under controlled conditions. Hydrogen sulfide reacts
with lead acetate to form lead sulfide which produces a coloration on the paper varying from yellow to black, depending upon the
amount of hydrogen sulfide present.
4. Significance and Use
4.1 Liquefied petroleum gases and their products of combustion must not be unduly corrosive to the materials with which they
come in contact. The potential personnel exposure hazards of H S also make the detection and measurement of hydrogen sulfide
2
important, even in low concentrations. In addition, in some cases the odor of the gases mustshall not be objectionable. (See
Specification D1835 and GPA 2140.)
5. Interferences
5.1 Methyl mercaptan, if present, produces a transitory yellow stain on the lead acetate paper that will fade completely in less
than 5 min.
5.2 Other sulfur compounds present in liquefied petroleum gas do not interfere with the test.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.H0 on
Liquefied Petroleum Gas.
Current edition approved Aug. 15, 2012Nov. 1, 2012. Published November 2012February 2013. Originally approved in 1965. Last previous edition approved in 20072012
as D2420–07.–12. DOI: 10.1520/D2420-12.10.1520/D2420-12A.
2
This test method is based on Edwards, J. D., and McBride, R. S., “Lead Acetate Test for Hydrogen Sulphide in Gas,” Technologic Papers T41, National Institute for
Standards and Technology, Aug. 9, 1914.
3
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.
4
Available from Gas Processors Association (GPA), 6526 E. 60th St., Tulsa, OK 74145.74145, www.gpaglobal.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D2420 − 12a
6. Apparatus and Materials
6.1 Apparatus for Detecting Hydrogen Sulfide in Liquefied Petroleum Gas, as shown in Fig. 1 or commercially available
apparatus.
6.2 Lead Acetate Test Paper—Commercially available test paper is satisfactory. Alternatively, the test paper may be prepared
by dipping strips of smooth filter paper in 5 % aqueous lead acetate solution and removing the excess solution with a clean blotter.
The strips of paper shall be approximately 50 mm long and 10 mm wide and contain a 3 mm hole near one end so they will hang
freely vertical in the test apparatus.
6.3 Gas Flow Indicator—A wet test meter or a rotameter, which measures Capable of measuring flow rates in the range of 2
to 3 L of gas/min.gas per minute. A wet test meter rotameter and mass flow controller have been found to be suitable.
6.4 Water—Distilled.Unless otherwise indicated, reference to water shall be understood to mean reagent water that m
...
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