ASTM D4517-2004(2009)
用无焰原子吸收光谱法测量高纯度水中低量硅总量的标准试验方法

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

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标准号

ASTM D4517-2004(2009)

发布日期

2004年

实施日期

废止日期

无

中国标准分类号

Z16

国际标准分类号

71.060.20 (Oxides)

发布单位

US-ASTM

适用范围

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 x03BC;g/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 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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