Simple and fast detection of hydrogen sulfide in liquefied petroleum gases:

Liquefied petroleum gases and the products of their combustion should not be unduly corrosive or reactive to materials with which they come into contact. It is therefore important that the presence of any hydrogen sulfide, a highly reactive substance, be detected. Additionally, the odour of hydrogen sulfide is unacceptable in some applications of liquefied petroleum gases (e.g. lighter fuel).

The vaporized sample is passed over moist lead acetate paper under controlled conditions. Hydrogen sulfide reacts with lead acetate to form lead sulfide and thus produces a coloration on the paper which will vary from yellow to black, depending upon the amount of hydrogen sulfide present.

The lower limit of detectability is 4 mg of hydrogen sulfide in 1 m3 of liquefied petroleum gas.
Methyl mercaptan, if present, produces a transitory yellow stain on lead acetate paper which, however, fades completely in less than 5 min. Other sulfur compounds present in liquefied petroleum gas do not interfere with the test.

A.1. Complete Testing Assembly Model 8819

Ready to use for qualitative detection of Hydrogen Sulfide in LPG as per EN ISO 8819 by Lead Acetate Method down to 4 mg H2S pr. cubic meter of LPG.

Including electrically heated thermostatic bath in stainless steel 304 and with latest electronic and 100 fold more accurate that standard requirements, gasmeter with couplings 1/4 inches NPT female and bench foot, pressure regulator, standard glassware set in borosilicate glass, stand with paper-holder spread and calibrated injector all in stainless steel and borosilicate glass (no rubber corks which cannot maintain steadily and vertically the test cell and may interact with the sulphur detection), stand, clamps, all necessary tubings, and reagent paper for 98 tests, but without gas sampling and monitoring system.

CE tested to EN 61010:1, EN 61010:2.010 Safety requirements for electrical equipment for measurement, control and laboratory use, EMC Directive (89/336/EEC), EN 61326:1997 Immunity and Emissions

A.2. Optional gas sampling and monitoring system

With the 3 required gas valves, and all necessary couplings and tubings, all made in high quality stainless steel 316L and able to withstand a 100 Bar pressure

Because of the chemical activity and physical adsorptive properties of hydrogen sulfide, it is highly desirable to connect the test apparatus directly to the sample source and perform the test on site, rather than transferring sample into a sample cylinder for testing in the laboratory.

Experience has demonstrated that the hydrogen sulfide concentration in liquefied petroleum gas samples collected in non-properly cleaned or non high quality stainless steel (i.e. not 316L-SS) sample cylinders is slightly increased.

A.3. Spare reagent paper

To EN ISO 8819 or ASTM D2420 for 98 tests

B.1. Complete Testing Assembly Model 2420

Ready to use for qualitative detection of Hydrogen Sulfide in LPG as per ASTM D2420 by Lead Acetate Method down to 4 mg H2S pr. cubic meter of LPG.

Including electrically heated thermostatic bath in stainless steel 304 and with latest electronic and 100 fold more accurate that standard requirements, gasmeter with couplings 1/4 inches NPT female and bench foot, pressure regulator, standard glassware set in borosilicate glass, stand with paper-holder spread and calibrated injector all in stainless steel and borosilicate glass (no rubber corks which cannot maintain steadily and vertically the test cell and may interact with the sulphur detection), stand, clamps, all necessary couplings and tubings, and reagent paper for 98 tests, but without gas sampling and monitoring system.

CE tested to EN 61010:1, EN 61010:2.010 Safety requirements for electrical equipment for measurement, control and laboratory use, EMC Directive (89/336/EEC), EN 61326:1997 Immunity and Emissions.

B.2. Optional gas sampling and monitoring system

With the 3 required gas valves, and all necessary couplings and tubings, all made in high quality stainless steel 316L and able to withstand a 100 Bar pressure

Because of the chemical activity and physical adsorptive properties of hydrogen sulfide, it is highly desirable to connect the test apparatus directly to the sample source and perform the test on site, rather than transferring sample into a sample cylinder for testing in the laboratory.

Experience has demonstrated that the hydrogen sulfide concentration in liquefied petroleum gas samples collected in non-properly cleaned or non high quality stainless steel (i.e. not 316L-SS) sample cylinders is slightly increased.

B.3. Spare reagent paper

To EN ISO 8819 or ASTM D2420 for 98 tests

see also:
Hydrogen Sulfide Tester