ASTM D4517

ASTM D4517 – Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy

Description:

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.

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 μg/L 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.