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D5951-96 – Standard Test Method Technical Guide
📋 Introduction and Scope
The ASTM standard D5951-96 (Reapproved 2002) standardizes the preparation of residual solids from biodegradability testing of plastics for subsequent toxicity and compost quality testing. It covers storage and drying of mixtures from aerobic composting (D5338) and anaerobic digestion (D5511), and provides materials for terrestrial toxicity tests or water extraction for aquatic tests per Practice D5152, in conjunction with guides E729, E1192, E1295, E1440, and OECD guidelines. No ISO equivalent exists, and SI units are standard.
⚗️ Key Procedures for Residual Solid Preparation
Residual solids are collected at the end of biodegradability tests. The practice includes protocols for storage and drying to maintain sample integrity. The mixtures are then used for toxicity testing or further degradation analysis. If toxicity is detected, chemical characterization can identify the source, but analysis methods are beyond this practice’s scope.
🧪 Applications in Toxicity and Compost Quality Testing
The prepared solids are used with guides E729, E1192, E1295, and E1440 for aquatic toxicity tests, and for soil contact biodegradation testing. The following tables list key standards and guides referenced in this practice.
| 🟦 Standard | 📏 Purpose |
|---|---|
| D5338 | Aerobic biodegradation under controlled composting |
| D5511 | Anaerobic biodegradation under high-solids digestion |
| D5152 | Water extraction of solids for toxicity testing |
| 🟦 Guide | 📏 Application | ⚡ Test Species |
|---|---|---|
| E729 | Acute toxicity tests with aquatic organisms | Fish, macroinvertebrates, amphibians |
| E1192 | Acute toxicity on aqueous samples | Fish, macroinvertebrates |
| E1295 | Chronic toxicity with Ceriodaphnia dubia | Ceriodaphnia dubia |
| E1440 | Acute toxicity with rotifer Brachionus | Rotifer Brachionus |
💡 Tip: Proper drying and storage of residual solids is critical to obtain valid toxicity and compost quality results.
⚡ Note: Users must implement safety protocols as per regulatory requirements, as the standard does not cover all safety aspects.
❓ Frequently Asked Questions
🔍 What is the purpose of D5951-96?
It provides a standard method for preparing residual solids after biodegradation tests for toxicity and compost quality evaluation.
💡 How are the residual solids prepared?
They are collected, stored, and dried according to protocols from the biodegradation test methods like D5338 or D5511.
⚡ What tests can the prepared solids be used for?
They can be used for terrestrial toxicity tests, aquatic toxicity tests via water extraction, and soil contact biodegradation tests.
📌 Is there an international equivalent?
No, there is no ISO standard equivalent to this practice.