BS EN 12485:2010 Chemicals used for treatment of water intended for human consumption. Calcium carbonate, high-calcium lime, half-burnt dolomite, magnesium oxide and calcium magnesium carbonate. Test methods
BS EN 12485 is a European Standard specifies the methods used for the chemical analyses and the determination of physical properties of calcium carbonate, high-calcium lime, half-burnt dolomite, magnesium oxide and calcium magnesium carbonate used to treat water for human consumption.
BS EN 12485 describes the reference methods and, in certain cases, an alternative method which can be considered to be equivalent. In the case of a dispute, only the reference methods are used.
Any other methods may be used provided they are calibrated, either against the reference methods or against internationally accepted reference materials, in order to demonstrate their equivalence.
Schematic diagrams of the analyses are given in Annex A
Contents of BS EN 12485:
Foreword
1 Scope
2 Normative references
3 General requirements
3.1 Number of determinations
3.2 Methods for analysis
3.3 Sample preparation
3.4 Reagents
3.5 Glassware
3.6 Expression of results
3.7 Repeatability and reproducibility limits
3.8 Test report
4 Determination of screen oversize of high-calcium lime
4.1 Air-jet sieving method
4.2 Wet sieving method
5 Preparation of test solutions
5.1 Fusion with lithium tetraborate
5.2 Extraction with hydrochloric acid
5.3 Microwave digestion with nitric acid
5.4 Pressurized digestion with nitric acid
6 Conventional methods of determining major and minor constituents
6.1 Determination of free water
6.2 Loss on ignition at 450 °C
6.3 Determination of carbon dioxide
6.4 Determination of residue insoluble in hydrochloric acid
6.5 Determination of content of water soluble calcium oxide or calcium hydroxide (reference method)
6.6 Determination of sugar soluble calcium oxide or calcium hydroxide (alternative method)
6.7 Water-insoluble matter
6.8 Determination of free CaO
6.9 Determination of calcium oxide and magnesium oxide
6.10 Determination of sulfate
6.11 Determination of solubility index by conductivity
6.12 Calculation of the composition of a commercial product
7 Determination of constituents by modern techniques
7.1 Determination of minor constituents by AAS flame technique
7.2 Determination of major and minor constituents by ICP-OES
8 Determination of trace elements
8.1 Determination of lead, cadmium, chromium and nickel by AAS graphite tube technique
8.2 Determination of lead, cadmium, chromium and nickel by ICP-OES
8.3 Determination of arsenic, antimony and selenium by AAS hydride technique
8.4 Determination of mercury by cold-vapour technique
Annex A (informative) Analytical scheme
Annex B (informative) Table B.1: Precision data for the test methods
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