ASTM D2420-07

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Designation:D2420 −07
StandardTest Method for
Hydrogen Sulfide in Liquefied Petroleum (LP) Gases (Lead
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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* 4. Significance and Use
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1.1 This test method covers the detection of hydrogen 4.1 Liquefied petroleum gases and their products of com-
sulfide in liquefied petroleum (LP) gases.The sensitivity of the bustion must not be unduly corrosive to the materials with
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test is about 4 mg/m (0.15 to 0.2 grain of hydrogen sulfide per which they come in contact. The potential personnel exposure
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100 ft ) of gas. hazards of H S also make the detection and measurement of
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hydrogen sulfide important, even in low concentrations. In
1.2 The values stated in SI units are to be regarded as
addition, in some cases the odor of the gases must not be
standard. The values given in parentheses are for information
objectionable. (See Specification D1835 and GPA 2140.)
only.
1.3 This standard does not purport to address all of the
5. Interferences
safety concerns, if any, associated with its use. It is the
5.1 Methyl mercaptan, if present, produces a transitory
responsibility of the user of this standard to establish appro-
yellow stain on the lead acetate paper that will fade completely
priate safety and health practices and determine the applica-
in less than 5 min.
bility of regulatory limitations prior to use.
5.2 Other sulfur compounds present in liquefied petroleum
2. Referenced Documents
gas do not interfere with the test.
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2.1 ASTM Standards:
6. Apparatus and Materials
D1835 Specification for Liquefied Petroleum (LP) Gases
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6.1 Apparatus for Detecting Hydrogen Sulfide in Liquefied
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
3. Summary of Test Method
paper is satisfactory. Alternatively, the test paper may be
prepared by dipping strips of smooth filter paper in 5 %
3.1 The vaporized LP gas is passed over moist lead acetate
aqueous lead acetate solution and removing the excess solution
paper under controlled conditions. Hydrogen sulfide reacts
with a clean blotter. The strips of paper shall be approximately
with lead acetate to form lead sulfide which produces a
50mmlongand10mmwideandcontaina3mmholenearone
coloration on the paper varying from yellow to black, depend-
end so they will hang freely vertical in the test apparatus.
ing upon the amount of hydrogen sulfide present.
6.3 Flow Indicator—Awet test meter or a rotameter, which
measures flow rates in the range of 2 to 3 L of gas/min.
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This test method is under the jurisdiction of ASTM Committee D02 on
6.4 Water—Distilled.
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
D02.H0 on Liquefied Petroleum Gas.
6.5 Tubing—High pressure connecting tubing to connect the
Current edition approved Feb. 15, 2007. Published March 2007. Originally
test apparatus to the sample collection point. Internally clean
approved in 1965. Last previous edition approved in 2001 as D2420–91(2001).
stainless steel material is recommended, but other materials
DOI: 10.1520/D2420-07.
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This test method is based on Edwards, J. D., and McBride, R. S., “LeadAcetate that safely contain the pressure, resist being cut or torn, and
Test for Hydrogen Sulphide in Gas,” Technologic Papers T41, National Institute for
have been tested to be inert relative to the stream being tested
Standards and Technology, Aug. 9, 1914.
may be utilized.
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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 7. Sampling
the ASTM website.
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7.1 (Warning—Because of the chemical activity and physi-
Available from Gas ProcessorsAssociation (GPA), 6526 E. 60th St., Tulsa, OK
74145. cal adsorptive properties of hydrogen sulfide, it is highly
*A Summary of Changes section appears at the end of this standard
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D2420−07
FIG. 1Apparatus for Detecting Hydrogen Sulfide in Liquefied Petroleum Gas
desirable to connect the test apparatus directly to the sample that the paper is held midway between the watchglass and the
source and perform the test in the field, rather than transferring botto
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