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EN ISO 12937:2000

Current
Current

The latest, up-to-date edition.

Petroleum products - Determination of water - Coulometric Karl Fischer titration method (ISO 12937:2000)
Published date

01-11-2000

Foreword
1 Scope
2 Normative references
3 Principle
4 Chemicals and materials
5 Apparatus
6 Sampling and sample preparation
7 Apparatus preparation
8 Apparatus check test
9 Procedure
10 Calculation
11 Expression of results
12 Precision
13 Test report
Annex A (normative) Sample handling
Annex B (informative) Alternative test method using
                      volumetric determination
                      of sample size

This International Standard specifies a method for the direct determination of water in petroleum products boilingbelow 390 °C. It covers the mass fraction range 0,003 % (m/m) to 0,100%(m/m). It is not applicable to productscontaining ketones or to residual fuel oils.This International Standard may be applicable to lubricating base oils. However, the precision has not beenestablished for these materials.The precision given in clause 12 is based upon data obtained using dual-cell, dual-electrolyte systems.NOTE 1 A number of substances and classes of compounds associated with condensation or oxidation-reduction reactionsinterfere in the determination of water by Karl Fischer titration. In petroleum products, the most common interferences arehydrogen sulfide and mercaptan sulfur, however, mass fractions of these below 0,003 % (m/m) as sulfur will not causesignificant interference over the range 0,003 % (m/m) to 0,100%(m/m) water. Other organic sulfur compounds commonlypresent such as sulfides, disulphides and thiophenes, do not interfere.NOTE 2 An alternative procedure is provided for information in annex B for the direct determination of water over the range0,003 % (V/V) to 0,100 % (V/V) in petroleum products. The limitations under which this alternative volume measurement may beused are listed in annex B.NOTE 3 For the purposes of this International Standard, the terms "% (m/m)" and "% (V/V)" are used to represent the massand volume fraction of a material respectively.

Committee
CEN/TC 19
DocumentType
Standard
PublisherName
Comite Europeen de Normalisation
Status
Current

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S.R. CEN/TR 16389:2017 AUTOMOTIVE FUELS - PARAFFINIC DIESEL FUEL AND BLENDS WITH FAME - BACKGROUND TO THE PARAMETERS REQUIRED AND THEIR RESPECTIVE LIMITS AND DETERMINATION
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DIN EN 14213:2003-11 HEATING FUELS - FATTY ACID METHYL ESTERS (FAME) - REQUIREMENTS AND TEST METHODS
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ISO 3171:1988 Petroleum liquids — Automatic pipeline sampling
ISO 3170:2004 Petroleum liquids — Manual sampling
ISO 3696:1987 Water for analytical laboratory use — Specification and test methods

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