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Description of ASTM-D7126 2010ASTM D7126 - 10Standard Test Method for On-Line Colorimetric Measurement of SilicaActive Standard ASTM D7126 | Developed by Subcommittee: D19.03 Book of Standards Volume: 11.01 ASTM D7126Significance and Use Silicon (Si), a metalloid, is the second most abundant element in the earth s crust. Various forms of silica (silicon dioxide SiO 2 ) are found in quartz, sand and rocks. The degradation of these rocks results in silica found in natural waters. Silica in natural waters can be found as ionic silica, silicates, colloidal or suspended particles. Elevated temperatures and pressure can cause silica in water to vaporize and form deposits or scale. Scale deposits of silica will coat boilers and turbine blades used in power plants. The presence of silica scale affects the ability of metals to transfer heat. Silica needs to be removed when deionized water is used as a rinse for manufacturing wafers in the semiconductor industry. Silica is commonly removed by demineralization using anion exchange resins, distillation, reverse osmosis or precipitation in a lime softening process. The on-line measurement of silica is the preferred method to laboratory analyses for industries trying to obtain and monitor ultra-pure water. Since silica is one of the first species to breakthrough anion exchange resins, on-line silica monitoring is frequently used to determine the need for regeneration of an anion or mixed resin bed. 1. Scope 1.1 This test method covers the on-line determination of soluble silica in water by colorimetric analysis using the molybdenum blue method, also known as the heteropoly blue method. 1.2 This test method is applicable for silica determination in water with silica concentrations within 0.5 - 5000 ppb ( ? g/L). 1.3 This test method covers the determination of soluble silica SiO 2 (silicon dioxide) or silicates in water. Soluble silica compounds are considered molybdate reactive silica. This test method does not cover the determination of colloidal or polymeric silica, which is considered non-molybdate reactive silica. 1.4 This test method does not cover the laboratory or grab sample measurement of silica in water. Refer to Test Method D859 . 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 and health practices and determine the applicability of regulatory limitations prior to use.
ASTM Standards D859 Test Method for Silica in Water D1066 Practice for Sampling Steam D1129 Terminology Relating to Water D1193 Specification for Reagent Water D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water D3370 Practices for Sampling Water from Closed Conduits D3864 Guide for Continual On-Line Monitoring Systems for Water Analysis D5540 Practice for Flow Control and Temperature Control for On-Line Water Sampling and Analysis Keywords colorimetric; on-line; process measurement; silica; Measurement processes/systems; Molybdenum; Silica; Calorimeter; Water analysis; Water sampling ; ICS Code ICS Number Code 13.060.50 (Examination of water for chemical substances) DOI: 10.1520/D7126-10 ASTM International is a member of CrossRef. ASTM D7126The 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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