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D1722-09 – Standard Test Method Technical Guide
🔍 Test Method Overview
This test method, designated D1722-09 (2023), determines the water miscibility of water‑soluble solvents. It is specifically written for testing acetone, isopropyl alcohol (isopropanol), and methyl alcohol (methanol), but is applicable to most water‑soluble solvents. The method qualitatively detects water‑immiscible contaminants by diluting the specimen and examining the mixture for cloudiness or turbidity.
The detection level varies widely with solvent and impurity type (e.g., paraffins, olefins, aromatics, high molecular weight alcohols). The test is normally performed at ambient temperature, but other temperatures may be specified by agreement between consumer and supplier.
⚙️ Procedure and Equipment
The apparatus required is a 250 mL glass‑stoppered graduated cylinder. The reagent water must conform to Type IV or better of ASTM Specification D1193.
Transfer 25 mL of the sample to a clean 250 mL graduated cylinder, dilute to the 250 mL mark with water, and mix thoroughly. Allow any bubbles to rise to the surface. Prepare a blank with 250 mL of water in a second cylinder for comparison.
| 🟦 Component | 📏 Specification |
|---|---|
| Sample Volume | 25 mL |
| Total Dilution | 250 mL (10 volumes) |
| Water Quality | Type IV or better (ASTM D1193) |
📊 Significance and Use
Water‑insoluble materials in a solvent expected to be completely water miscible can interfere with its use. This test method provides a measure of miscibility with water and a qualitative indication of contaminants. Results may be used in assessing compliance with specifications; interpretation of what constitutes cloudiness or turbidity should be agreed upon between supplier and purchaser.
⚠️ Safety Note: Consult the supplier’s Safety Data Sheet for hazard information. The user must establish appropriate safety, health, and environmental practices and comply with regulatory limitations.
💡 Technical Note: The level of detection for water‑insoluble impurities varies with solvent and impurity type. No specific concentration is detected by this procedure. Using water that meets Type IV specifications is essential for consistent results.
❓ Frequently Asked Questions
🔍 What does this test method detect?
It qualitatively detects water‑immiscible contaminants in water‑soluble solvents by observing cloudiness or turbidity after dilution.
💡 Which solvents are specifically mentioned?
The method is written for acetone, isopropyl alcohol (isopropanol), and methyl alcohol (methanol), but it is suitable for most water‑soluble solvents.
⚡ What is the dilution ratio in the procedure?
The specimen is diluted to 10 volumes with water: 25 mL of sample is diluted to a total volume of 250 mL.
📌 What water quality is required?
Reagent water conforming to Type IV or better of ASTM Specification D1193 must be used.