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D6139-22 – Standard Test Method Technical Guide
📐 Test Method Overview and Scope
This test method covers the determination of the degree of aerobic aquatic biodegradation of fully formulated lubricants or their components on exposure to an inoculum under controlled laboratory conditions. It is an ultimate biodegradation test that measures carbon dioxide (CO2) evolution. The standard addresses difficulties with water-insoluble materials and complex mixtures found in many lubricants. It is applicable to non-volatile lubricants that are not toxic or inhibitory at the test concentration. Values are stated in SI units.
⚙️ Test Procedure and Key Requirements
The Gledhill Shake Flask is used for the test. The standard references several key ASTM and other standards for quality control. Below is a table of essential referenced documents:
| 🟦 Standard Designation | 📏 Title and Purpose |
|---|---|
| D1193 | Specification for Reagent Water |
| D1293 | Test Methods for pH of Water |
| D4447 | Guide for Disposal of Laboratory Chemicals and Samples |
| D5291 | Test Methods for Instrumental Determination of Carbon, Hydrogen, and Nitrogen in Petroleum Products and Lubricants |
| D5864 | Test Method for Determining Aerobic Aquatic Biodegradation of Lubricants or Their Components |
| E943 | Terminology Relating to Biological Effects and Environmental Fate |
Additionally, ISO 4259:1992 is used for precision data, and APHA standards 2540B (total solids) and 9215 (heterotrophic plate count) are referenced.
📊 Biodegradation Measurement and Calculations
The biodegradation is quantified by measuring CO2 evolution over time. The test conditions ensure aerobic aquatic environments. The following table summarizes key test parameters:
| 🔬 Parameter | 📐 Specification or Requirement |
|---|---|
| Test Type | Ultimate biodegradation test |
| Basis of Measurement | Carbon dioxide (CO2) evolution |
| Material Suitability | Non-volatile, non-toxic, non-inhibitory |
| Environmental Conditions | Aerobic, controlled laboratory settings |
| Inoculum Source | Standardized aquatic inoculum |
💡 Tip: For water-insoluble materials like lubricants, this method effectively captures biodegradation through direct CO2 measurement.
⚠️ Caution: Always review Section 10 for specific safety precautions and use Guide D4447 for proper disposal of test materials.
❓ Frequently Asked Questions
🔍 What is the main purpose of ASTM D6139-22?
The standard determines the degree of aerobic aquatic biodegradation of lubricants by measuring CO2 evolution in the Gledhill Shake Flask test.
💡 Which lubricants are not suitable for this test?
Volatile lubricants or those that are toxic or inhibitory to the inoculum at the test concentration are not suitable.
⚡ How does the test measure biodegradation?
It measures the carbon dioxide evolved during respiration of the inoculum exposed to the lubricant under aerobic conditions.
📌 What is the significance of referenced standard D5864?
D5864 is a similar standard for aerobic aquatic biodegradation of lubricants, providing comparative precision and methodology.