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Description of ASTM-E1787 2025ASTM E1787-25Active Standard: Standard Test Method for Anions in Caustic Soda and Caustic Potash (Sodium Hydroxide and Potassium Hydroxide) by Ion ChromatographyASTM E1787Scope 1.1 This test method covers the determination of anionic impurities in 50 % caustic soda (sodium hydroxide) and 50 % caustic potash (potassium hydroxide) solutions using ion chromatography (IC). Anions that can be determined at concentrations of approximately 0.1 μg/g up to 1000 μg/g (ppm) include: bromide, chlorate, chloride, fluoride, nitrate, phosphate, and sulfate. LOD and LOQ for SO4 in 45 % KOH is 0.9 μg/g and 3.0 μg/g. Note 1: This method is preferentially used for low salt caustic produced by the membrane production where the salt is typically less than 100 mg/kg (ppm). 1.2 By varying the sample size, this test method can be used for anhydrous caustic soda and caustic potash products, as well as other concentrations of liquid products. 1.3 This test method is not intended to be used to quantify chloride in diaphragm produced caustic soda where the sodium chloride concentration is approximately 1 %. For the most accurate determinations, it is recommended that high concentrations of chloride be analyzed using a potentiometric titration procedure, such as the one described in Test Methods E291. 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.5 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 8. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Keywords bromide; caustic potash; caustic soda; chlorate; chloride; chromatography; fluoride; ion chromatography; nitrate; phosphate; potassium hydroxide; sodium hydroxide; sulfate; ICS Code ICS Number Code 71.040.50 (Physicochemical methods of analysis) DOI: 10.1520/E1787-25 The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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