ASTM D4517-04
Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
- Standard No.
- ASTM D4517-04
- Release Date
- 2004
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D4517-04(2009)
- Latest
- ASTM D4517-15(2023)
- Scope
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.
1.1 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 [mu]g/L of silica as SiO . 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 D4517-04 Referenced Document
- ASTM D1066 Standard Practice for Sampling Steam
- ASTM D1129 Standard Terminology Relating to Water
- ASTM D1192 Standard Guide for Equipment for Sampling Water and Steam in Closed Conduits
- ASTM D1193 Standard Specification for Reagent Water
- ASTM D2777 Standard Practice for Determination of Precision and Bias of Applicable Methods of Committee D-19 on Water
- ASTM D3370 Standard Practices for Sampling Water from Closed Conduits
- ASTM D3919 Standard Practice for Measuring Trace Elements in Water by Graphite Furnace Atomic Absorption Spectrophotometry
- ASTM D4453 Standard Practice for Handling of Ultra-Pure Water Samples
- ASTM D5810 Standard Guide for Spiking into Aqueous Samples
- ASTM D5847 Standard Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
- ASTM D859 Standard Test Method for Silica in Water
ASTM D4517-04 history
- 2023 ASTM D4517-15(2023) Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
- 2015 ASTM D4517-15 Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
- 2009 ASTM D4517-04(2009) Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
- 2004 ASTM D4517-04 Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
- 1985 ASTM D4517-85(1999) Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
