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Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
STANDARD published on 1.8.2015
Designation standards: ASTM D4517-15
Note: WITHDRAWN
Publication date standards: 1.8.2015
SKU: NS-615804
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM
Keywords:
atomic spectroscopy, boiler water, graphite furnace, high-purity water, silica,, ICS Number Code 71.060.20 (Oxides)
Significance and Use | ||||||||||||||||||||||
5.1 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. 5.2 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. |
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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 μg/L of silica as SiO2. 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 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 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. |
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2. Referenced Documents | ||||||||||||||||||||||
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