Contents 1. Scope 2. Cited normative documents 3. Molecular formula and relative molecular mass 4. Technical requirements A.1 Cautions A.2 General conditions A.3 Identification A.4 Determination of trisodium phosphate content A.5 Determination of pH value A.6 Determination of content of arsenic A.7 Determination of content of fluorine A.8 Determination of content of heavy metal A.9 Determination of content of Pb A.10 Determination of content of water insoluble substance A.11 Determination of ignition loss |