The ASTM D5705 standard is a critical protocol used in the petroleum and maritime industries to measure hydrogen sulfide ( H2Scap H sub 2 cap S
It is applicable to liquids with a viscosity range of 5.5 mm²/s at 40° C to 50 mm²/s at 100° C.
The standard requires panelists to have undergone a sensory screening test (e.g., using reference odorants) to ensure reliability.
The official PDF document is essential for laboratory personnel because it provides:
After heating, the container is safely agitated or shaken using a standardized motion. This step accelerates the migration of H2Scap H sub 2 cap S astm d5705 pdf
A specific volume of a residual fuel sample is placed into a clean test bottle, leaving a designated air space (headspace) above the liquid.
The sample is heated and shaken as described in the standard to generate a representative vapor headspace.
) in the vapor phase (headspace) above residual fuel oils. This test is critical for safety and regulatory compliance in the maritime and petroleum industries. 1. Abstract
ASTM International holds the copyright for all its standards. To obtain an official, legally compliant copy of the , you should purchase it directly through authorized channels: The ASTM D5705 standard is a critical protocol
While the official ASTM D5705 PDF should always be consulted for exact dimensions and tolerances, the general workflow follows these rigid steps: 1. Apparatus and Material Preparation Standardized glass test bottles (usually 1-liter capacity). A temperature-controlled heating bath or air oven. Hand-operated or automated bellows pumps. H2Scap H sub 2 cap S
The typical Occupational Safety and Health Administration (OSHA) permissible exposure limit (PEL) over an 8-hour shift. 100 ppm: Immediately Dangerous to Life or Health (IDLH).
: A detector tube and pump are used to measure the vapor.
, notorious for its characteristic "rotten egg" smell at low concentrations. At higher levels, it rapidly causes olfactory fatigue, leading to a false sense of security just before it becomes immediately dangerous to life and health. In the heavy marine and industrial fuel oil industry, H₂S can accumulate to lethal levels in the vapor phase (the "headspace") of storage tanks and barges. ASTM D5705 was created specifically to provide a simple, reliable field test for this exact hazard, ensuring safety for personnel and compliance with strict health regulations. This step accelerates the migration of H2Scap H
Understanding ASTM D5705: A Guide to Hydrogen Sulfide Measurement in Residual Fuel Oils
: Specifically applicable to liquids with viscosities ranging from 5.5 at 40°C to 50
It specifically measures the vapor phase concentration, expressed in parts per million by volume ( ppm v/vppm v/v ), rather than the dissolved H2Scap H sub 2 cap S within the liquid fuel itself.