BS EN 12946:2023

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Liming materials. Determination of the calcium content and magnesium content. Complexometric method

Published By	Publication Date	Number of Pages
BSI	2023	14

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Description

TThis document specifies a complexometric method for the determination of the calcium content and the magnesium content of liming materials. It is not applicable to products with a mass fraction less than 2 % magnesium or those with a mass fraction more than 1 % P2O5 and is not applicable to silicate liming materials.

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PDF Pages	PDF Title
2	undefined
7	1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents 5.1 General 5.2 Hydrochloric acid solution
8	5.3 Hydrochloric acid solution 5.4 Hydrochloric acid solution 5.5 Standard calcium solution, containing 2,004 g of calcium per litre 5.6 Standard magnesium solution, containing 1,216 g of magnesium per litre 5.7 Ethylenediamine tetraacetic acid (EDTA) standard solution, c(EDTA) = 0,05 mol/l 5.8 Calcein thymolphthalein indicator
9	5.9 Calcon carbonic acid indicator 5.10 Eriochrome black T indicator 5.11 Triethanolamine 5.12 Buffer solution, pH 10,5 5.13 Sodium hydroxide solution 6 Apparatus 7 Sampling 8 Procedure 8.1 Preparation 8.1.1 Preparation of test sample
10	8.1.2 Preparation of test solution 8.2 Determination 8.2.1 Aliquot portion 8.2.2 Titration in the presence of eriochrome black T 8.2.3 Titration in the presence of calcein thymolphthalein or calcon carbonic acid
11	8.3 Control test of the standard solutions 9 Expression of results 10 Precision 10.1 General
12	10.2 Repeatability 10.3 Reproducibility 11 Test report

Additional information

Status	Definitive
Pages	14
Publication Date	2023-06-20
ISBN	978 0 539 18859 2
Standard Number	BS EN 12946:2023
Title	Liming materials. Determination of the calcium content and magnesium content. Complexometric method
Identical National Standard Of	EN 12946
Replaces	BS EN 12946:2000
Descriptors	Lime, Chemical reagents, Chemical analysis and testing, Reproducibility, Specimen preparation, Determination of content, Fertilizers, Precision, Calcium, Magnesium, Complexometric titrations
Publisher	BSI
Committee	CII/37
ICS Codes	65.080 - Fertilizers

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BS EN 12946:2023

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