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D1301-91 – Standard Test Method Technical Guide
📜 Scope and Significance of D1301-91
ASTM D1301-91 (Reapproved 2020) covers standardized test methods for the chemical analysis of basic carbonate white lead and basic sulfate white lead pigments. Developed under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications, these methods are essential for determining pigment purity and establishing compliance with specification requirements. The standard has been approved for use by agencies of the U.S. Department of Defense.
The values stated in SI units are regarded as the standard, and the procedures are suitable for determining the levels of various impurities found in these traditional white lead pigments.
⚠️ Safety Notice: This standard does not purport to address all safety concerns associated with its use. It is the responsibility of the user to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to handling lead-based materials.
🧪 Chemical Analysis Procedures for White Lead
These test methods provide distinct analytical procedures tailored to the chemical composition of each pigment type. For basic carbonate white lead, methods include the determination of small amounts of iron (Section 7), total lead (Section 8), carbon dioxide by both evolution and combustion methods (Sections 10 and 11), lead carbonate (Section 12), and total matter insoluble in acetic acid (Section 13) and acid ammonium acetate (Section 14). For basic sulfate white lead, specific procedures cover total sulfate (Section 20), zinc oxide (Section 21), and basic lead oxide (Section 22).
| 🟦 Test Analysis | 📐 Section (Carbonate) | 📏 Section (Sulfate) | ⚡ Reference Standard |
|---|---|---|---|
| Preparation of Sample | 6 | 6 | — |
| Small Amounts of Iron | 7 | 17 | — |
| Total Lead | 8 | 18 | — |
| Moisture & Volatile Matter | 9 | 19 | D280 |
| Carbon Dioxide (Evolution) | 10 | — | — |
| CO₂ & H₂O (Combustion) | 11 | — | — |
| Lead Carbonate | 12 | — | — |
| Insoluble in Acetic Acid | 13 | — | — |
| Insoluble in Acid Amm. Acetate | 14 | — | — |
| Total Sulfate | — | 20 | — |
| Zinc Oxide | — | 21 | D3280 |
| Basic Lead Oxide | — | 22 | — |
| Total Impurities | 15 | 23 | — |
| Coarse Particles | 16 | 24 | D185 |
💡 Method Selection Tip: For basic carbonate white lead, the standard offers two distinct paths for carbon dioxide analysis. The Evolution Method (Section 10) is specific to CO₂, while the Combustion Method (Section 11) simultaneously determines combined water, providing a more complete compositional picture in a single test run.
⚙️ Reagents, Apparatus, and Compliance Standards
All reagents used must be reagent grade conforming to the specifications of the American Chemical Society. Reagent water must comply with ASTM D1193. The standard relies on several other ASTM standards for specific procedures and apparatus, ensuring consistency across testing laboratories.
| 📏 Standard | 🎯 Application in D1301-91 |
|---|---|
| D185 | Test Methods for Coarse Particles in Pigments (Sections 16 & 24) |
| D215 | Practice for Chemical Analysis of White Linseed Oil Paints (Pigment Separation) |
| D280 | Test Methods for Hygroscopic Moisture in Pigments (Sections 9 & 19) |
| D1193 | Specification for Reagent Water |
| D3280 | Test Methods for Analysis of White Zinc Pigments (Section 21) |
| E11 | Specification for Woven Wire Test Sieve Cloth (Coarse Particles) |
This standard was developed in accordance with internationally recognized principles on standardization established by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
❓ Frequently Asked Questions
🔍 What types of pigments are covered by ASTM D1301-91?
The standard covers chemical analysis procedures specifically for basic carbonate white lead and basic sulfate white lead pigments. If separation from other pigments is required, it refers to Practice D215.
💡 Why does the standard provide two methods for Carbon Dioxide determination?
The Evolution Method (Section 10) isolates and measures carbon dioxide gravimetrically. The Combustion Method (Section 11) uses a combustion train to determine both carbon dioxide and combined water, offering a more comprehensive analysis of the carbonate pigment in a single procedure.
📌 How is the Coarse Particles test performed for these pigments?
The test follows ASTM D185, which involves washing a pigment sample through a standard sieve (typically a 325 mesh, 45 µm sieve per ASTM E11) and determining the percentage of material retained as coarse particles (Sections 16 and 24).
⚡ What is the required grade for reagents used in these tests?
All reagents must be reagent grade chemicals that conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society. Water used in the procedures must meet the requirements of ASTM D1193, Specification for Reagent Water.