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D2110-00 – Standard Test Method Technical Guide
📋 Scope and Test Method Summary
This test method, designated D2110-00 (Reapproved 2022), covers the measurement of the pH of water extractions of halogenated organic solvents and their admixtures. It is applicable for virgin, reclaimed, or used solvents. The method involves shaking the solvent sample with freshly boiled neutral distilled or deionized water and determining the pH of the water extract using either a color indicator or a pH meter.
Users of this standard are responsible for establishing appropriate safety, health, and environmental practices. Determine the applicability of regulatory limitations before use.
⚙️ Test Procedures and Water Preparation
Neutral distilled or deionized water must be prepared by boiling 1 L of water for 5 minutes in a borosilicate glass or stainless steel container, then covering and cooling to room temperature.
Procedure A (Universal Indicator): Add 2 mL of Universal Indicator to a 50 mL aliquot of cooled boiled water. Titrate to pH 7 using 0.01 N HCl (if pH >7) or 0.01 N NaOH (if pH <7) by comparing with a pH Indicator Color Chart. Record the titer. The volume needed to adjust the remaining 950 mL of water is 19 times the titer.
Procedure B (pH Meter): Titrate a 50 mL aliquot to a pH of 7.0 to 7.3 using 0.01 N HCl or 0.01 N NaOH with a pH meter. Record the titer and adjust the remaining 950 mL water similarly.
Always use freshly boiled and neutralized water to ensure accurate pH measurements. Carbon dioxide absorption from air can alter water pH, so minimize exposure after boiling.
📊 Significance of pH Values
The pH of halogenated solvents varies with the stabilizers present. Solvents with alkaline stabilizers (amine-types) generally have pH in the 7 to 11 range, while those with neutral stabilizers (epoxide-types) have pH in the 5 to 7 range. Virgin and reclaimed solvents should maintain these pH ranges per the producer’s specifications. A drop in pH may indicate contamination or degradation, requiring further tests like acid acceptance or alkalinity assessment.
| 🧪 Stabilizer Type | 📊 Typical pH Range |
|---|---|
| Alkaline (amine-types) | 7 to 11 |
| Neutral (epoxide-types) | 5 to 7 |
| 🧪 Aliquot Volume | 📏 Recorded Titer (mL) | 💧 Water Volume to Adjust | ⚡ Adjustment Factor |
|---|---|---|---|
| 50 mL | From titration | 950 mL | 19 × Titer |
❓ Frequently Asked Questions
🔍 What is the purpose of this test method?
To measure the pH of water extractions of halogenated organic solvents to assess their condition and stabilizer effectiveness.
💡 How is neutral water prepared for this test?
Boil 1 L of distilled or deionized water for 5 minutes in a borosilicate glass or stainless steel container, then cover and cool to room temperature.
⚡ What pH ranges are expected for solvents with different stabilizers?
Alkaline stabilizers (amine-types) yield pH 7-11; neutral stabilizers (epoxide-types) yield pH 5-7.
📌 What does a lower-than-expected pH indicate?
It suggests potential contamination or stabilizer depletion, requiring further testing such as acid acceptance for epoxide stabilizers or alkalinity for alkaline stabilizers.