T/SXCIES 001-2020 The method for determining the pH of coal tar

Scope

Main Technical Content: Determination Method of pH in Coal Tar **Warning** — Personnel using this standard should have practical experience in laboratory work. This standard does not address all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with national regulations. **1. Scope** This standard provides a test method, experimental steps, and instruments and materials for determining the pH of coal tar obtained by condensation from gas during high-temperature coking. **2. Normative References** The following documents are essential for the application of this document. For dated references, only the version dated is applicable. For undated references, the latest version (including all amendment sheets) is applicable. - GB/T 1999: Sampling Methods for Coking Oil Products - GB/T 6682: Specifications and Test Methods for Water Used in Analytical Laboratories - GB/T 8170: Rules for Rounding Numerical Values and Determination and Judgment of Limit Values - GB/T 9977: Terminology for Coking Products - GB/T 27501: Preparation Methods for pH Determination Buffers **3. Principle** The sample is mixed with distilled water at pH approximately 7 in a certain ratio, heated and allowed to stand for a period of time, then filtered. The pH of the filtrate is measured using a pH meter. **4. Reagents** All reagents and water used in this standard refer to analytical-grade reagents and Class III water specified in GB/T 6682. - **4.1 Ammonia Water Solution**: 1+5. - **4.2 Hydrochloric Acid Solution**: 1+10. - **4.3 Standard Buffered Solutions at pH 4.00, pH 6.86, and pH 9.18**: Purchased or prepared according to GB/T 27501. - **4.4 Distilled Water at pH Approximately 7**: Measure 1000 mL of distilled water and adjust its pH to approximately 7 using ammonia water solution (4.1) or hydrochloric acid solution (4.2). **5. Instruments** - **5.1 Balance**: With a graduation of

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