analytical standards. Selecting the correct method depends entirely on whether you need to measure the gas in the or the liquid phase . Standard Method Target Phase Analytical Technique Common Application ASTM D5705 Vapor Phase (Headspace) Length-of-stain detector tubes Field screening, bunker fuel safety management ASTM D6021 Vapor Phase (Headspace) Gas chromatography or electronic sensors High-precision laboratory analysis ASTM D7621 Liquid Phase Microcoulometry / H2S Analyzer Rapid refinery testing, marine fuel compliance (ISO 8217) IP 570 Liquid Phase Phase separation and electrochemical detection Strict international marine fuel trading specifications
ASTM D5705 is one of several methods used for H₂S measurement, but it has a specific niche: Measures H₂S in the Vapor Phase (Headspace). ASTM D6021: Analyzes H₂S levels in the Liquid Phase .
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Residual fuel oils, often referred to as bunker fuel, heavy fuel oil (HFO), or bitumen blends, frequently contain varying levels of sulfur compounds. Over time, chemical reactions and thermal cracking can cause hydrogen sulfide gas to release from the liquid phase and concentrate in the vapor space of storage tanks, cargo holds, and transport barges. Health and Safety Hazards
The test method is applicable to liquids with a viscosity range of 5.5 mm²/s at 40 °C to 50 mm²/s at 100 °C. It applies to fuels conforming to ASTM Specification D396 Grade Nos. 4, 5 (Heavy), and 6. The applicable measurement range is from 5 μmol/mol to 4000 μmol/mol (which is equivalent to 5 ppm v/v to 4000 ppm v/v).
The test is typically conducted at a controlled temperature of 60°C (140°F) , which mimics typical fuel storage and handling temperatures.
ASTM D5705 is just one of three primary ASTM test methods for quantitatively measuring H₂S in residual fuels. The table below explains how they differ.
in the vapor phase above residual fuel oils. Often referred to as the "Can Test,"
H2S(g)+Pb(CH3COO)2(s)→PbS(s)+2CH3COOH(g)cap H sub 2 cap S open paren g close paren plus cap P b open paren cap C cap H sub 3 cap C cap O cap O close paren sub 2 open paren s close paren right arrow cap P b cap S open paren s close paren plus 2 cap C cap H sub 3 cap C cap O cap O cap H open paren g close paren
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dissolved inside the liquid phase (such as ASTM D7621), ASTM D5705 specifically measures the amount of H2Scap H sub 2 cap S
heating requirement will result in incorrect vapor concentration readings. H2Scap H sub 2 cap S
