BS EN 897:2012 pdf download – Chemicals used for treatment of water intended for human consumption — Sodium carbonate

BS EN 897:2012 pdf download – Chemicals used for treatment of water intended for human consumption — Sodium carbonate 1 Scope This European Standard is applicable to sodium carbonate used for treatment of water intended for humanconsumption. t describes the characteristics and specifies the requirements and the corresponding test methodsfor sodium carbonate. It gives information on its use in water treatment. It also determines the rules relating to safehandling and use (see Annex C). 2Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable forits application.For dated references, only the edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies. EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISo 3696) EN ISO 12846:2012, Water quality —Determination of mercury — Method using atomic absorption spectrometry(AAS) with and without enrichment (lsO 12846:2012) ISo 740,Sodium carbonate for industrial use —Determination of total soluble alkalinity —Titrimetric method ISO 746,Sodium carbonate for industrial use —Determination of matter insoluble in water at 50 degrees c ISO 2460，Sodium hydrogen carbonate for industrial use — Determination of iron content —1,10-Phenanthrolinephotometric method ISO 3165,Sampling of chemical products for industrial use — Safety in sampling ISO 6206,Chemical products for industrial use — Sampling — Vocabulary ISO 8213,Chemical products for industrial use — Sampling techniques — Solid chemical products in the form ofparticles varying from powders to coarse lumps 3 Description 3.1 Identification 3.1.1 Chemical name Sodium carbonate. 3.1.2 Synonym or common name Soda ash, anhydrous sodium carbonate, light soda ash, heavy soda ash. 3.1.3 Relative molecular mass 105,99. 3.1.4 Empirical formula Na 2 CO 3 3.1.5 Chemical formula Na 2 CO 3 . 3.1.6 CAS Registry Number 1) 497-19-8. 3.1.7 EINECS reference 2) 207-838-8. 3.2 Commercial forms The product is available as dry powder or fine granules and is described as light soda ash or heavy soda ash according to bulk density (see 3.3.2). 3.3 Physical properties 3.3.1 Appearance The product is a white powder or crystals, slightly hygroscopic. 3.3.2 Density The density of this product is 2,53 g/cm 3 . The bulk density is: ranging from 0,5 kg/dm 3 to 0,65 kg/dm 3 (light soda ash); ranging from 0,8 kg/dm 3 to 1,2 kg/dm 3 (heavy soda ash). 3.3.3 Solubility in water The product is soluble at 212 g/l at 20 °C. 3.3.4 Vapour pressure Not applicable. 3.3.5 Boiling...