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Description of ASTM-D4517 2009ASTM D4517 - 04(2009)Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption SpectroscopyActive Standard ASTM D4517 | Developed by Subcommittee: D19.03 Book of Standards Volume: 11.02 ASTM D4517Significance and Use Control of silica in boiler feedwater and boiler water is necessary to minimize the formation of scale-forming silicates that decrease heat transfer in the boiler. Volatilization and carryover of silica with the steam may cause hard, glassy siliceous deposits to form on turbine blades that reduce turbine efficiency. Colloidal silica that is not removed by boiler water pretreatment processes may be solubilized in the boiler and thus contribute to the dissolved silica concentration in the boiler. Both dissolved and total silica are of interest. 1. Scope 1.1 This test method covers the determination of total silica in water. 1.2 This test method is applicable in the range from 25 to 250 ? g/L of silica as SiO 2 . Higher concentrations may be determined by decreasing the aliquot volume (see Note 6). Concentration range should not be extended by dilution. 1.3 This test method determines total silica, and does not distinguish between soluble and insoluble forms. 1.4 This test method was tested on reagent water only. It is the user's responsibility to assure the validity of the test method for waters of other matrices. 1.5 This standard does not purport to address 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 D1192 Guide for Equipment for Sampling Water and Steam in Closed Conduits 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 D3919 Practice for Measuring Trace Elements in Water by Graphite Furnace Atomic Absorption Spectrophotometry D4453 Practice for Handling of High Purity Water Samples D5810 Guide for Spiking into Aqueous Samples D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis Keywords atomic spectroscopy; boiler water; graphite furnace; high-purity water; silica; Colloidal dispersions; High-purity water; Inorganic compounds--water; Silica content; Spectroscopy--atomic absorption; ICS Code ICS Number Code 71.060.20 (Oxides) DOI: 10.1520/D4517-04R09 ASTM International is a member of CrossRef. ASTM D4517This 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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