Potrebujeme váš súhlas na využitie jednotlivých dát, aby sa vám okrem iného mohli ukazovať informácie týkajúce sa vašich záujmov. Súhlas udelíte kliknutím na tlačidlo „OK“.
Standard Test Method for Low-Level Total Silica in High-Purity Water by Flameless Atomic Absorption Spectroscopy
Automaticky preložený názov:
Štandardná skúšobná metóda pre low-level Total oxidu kremičitého vo vysoko čistej vody by Bezplameňová atómovej absorpčnej spektroskopie
NORMA vydaná dňa 1.10.2009
Označenie normy: ASTM D4517-04(2009)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.10.2009
Kód tovaru: NS-27552
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
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 Number Code 71.060.20 (Oxides)
Significance 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 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 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. |
||||||||||||||||||||||
2. Referenced Documents | ||||||||||||||||||||||
|
Poskytovanie aktuálnych informácií o legislatívnych predpisoch vyhlásených v Zbierke zákonov od roku 1945.
Aktualizácia 2x v mesiaci !
Chcete vedieť viac informácii ? Pozrite sa na túto stránku.
Posledná aktualizácia: 2024-05-21 (Počet položiek: 2 903 041)
© Copyright 2024 NORMSERVIS s.r.o.