ASTM D6731 Determining Biodegradability of Lubricants in Soil
ASTM D6731 test method is also a test for aqueous aerobic biodegradability, but measures the biodegradability of lubricants, or their components, by following the rate of oxygen consumption in closed respirometers during the biodegradation process. This method applies to full lubricants or their ingredients.
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Introduction to ASTM D6731
ASTM D6731 is a standard method to test aerobic biodegradation of lubricants using soil. It is intended to test how lubricants, such as hydraulic, engine, and greases, decompose in an aerobic, microbial soil environment. This approach models land-based situations, such as spills, leaks, or land application.
ASTM D6731 Test Method
Test procedure
The lubricant or its components are tested in a laboratory line with activated sludge from communal sewage works. The oxygen consumption in the respirometer is monitored during the course of the experiment to determine the biodegradability of the lubricant. Compounds that exhibit a moderate degree of biodegradation are characterised as inherently biodegradable in the majority of aquatic environments.
ASTM D6731 Equipment and Sample Preparation
Specimen Details
The container is a sealed container and includes a CO₂ capturing device that consists of an alkaline solution that absorbs CO₂ generated by biodegradation. Temperature is maintained at ambient temperature, between 20 and 28 degrees Celsius, and moisture levels are adjusted to ensure good microbial activity.
ASTM D6731 Results and Interpretation
At the end of this test, the percentage of theoretical CO₂ generated from the complete degradation of the lubricant sample is determined. 60% CO₂ release during the testing period signifies that the substance is readily biodegradable in soil. More than 20% indicates that the lubricant is not easily biodegradable and could remain in the environment for an extended period. This test assesses both the lubricant’s chemical makeup and its availability for biological breakdown in soil.
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ASTM D6731 Testing
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Use of ASTM D6731 in Various Industries
This test is used in construction and mining (off-road machinery oils), municipal, and road maintenance.
ASTM D6731 Related Articles
OECD 301 and 302 series are related to this test, as these test methods also assess the biodegradation of lubricants in the environment. ASTM D5864 is used for the aquatic environment.
Materials Commonly Tested with ASTM D6731
This test is suitable for use on a wide range of materials, including those that are highly soluble, poorly soluble, insoluble, volatile, nonvolatile, and/or absorbing.
Common Challenges and Troubleshooting in ASTM D6731 Testing
The common challenges faced are inadequate blending of lubricants with soil, particularly with thicker or water-repellent substances; variability in soil characteristics, such as pH levels or microbial activity, may distort results; interference from CO₂ traps or evaporation could result in imprecise measurements and substances or impurities present in the lubricant may restrict microbial activity or hinder the breakdown process.
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Where can I get the astm d6731 tested?
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