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BS EN 196-10:2016

BS EN 196-10:2016

$167.15

Methods of testing cement – Determination of the water-soluble chromium (VI) content of cement

Published By Publication Date Number of Pages
BSI 2016 42
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This part of EN 196 specifies the method for the determination of the water-soluble chromium (VI) content of cement.

A reference method is described consisting of two stages, an extraction procedure and an analysis of the filtered extract. Guidance on other extraction procedures, suitable for screening tests, for factory production control or other purposes, is given but in case of dispute or failure to comply with a regulatory limit only the reference method is used. The reference method has alternatives whereby the filtered extract may be subjected to an oxidation step or not. The criteria by which the appropriate procedure is selected are set down. Other instrumental procedures may be used for the analysis of the filtered extract provided they are calibrated against the analysis of the filtered extract using the reference procedure. In the case of a dispute, only the reference method is used.

Annex A sets out a normative procedure to be followed in case this test method is used as the basis for evaluation of conformity of a cement with the regulatory limit in Regulation (EC) 1907/2006 2 .

This part of EN 196 describes a method that applies to cements. It may have wider applicability but this would need to be verified by testing on a product-by-product basis. Guidance in the possible application of this European Standard to the determination of the water-soluble chromium (VI) content of cement-containing preparations is given in Annex B.

Annexes C and D provide information on other test procedures based on paste extraction and thus depart from the performance of cement in its normal conditions of use. They may be carried out with or without the oxidation process. Users should be aware that results using these methods might be significantly different to those obtained by the reference method. In the case of dispute or failure to comply with the regulatory limit only the reference method is used.

Annex E provides guidance on a method for determination of the excess reducing agent content of cement as used in the factory internal control system of some countries. Manufacturers using such an internal control method should ensure themselves of the relevance of results in comparison with testing by the reference method.

PDF Catalog

PDF Pages PDF Title
5 European foreword
6 Introduction
7 1 Scope
2 Normative references
8 3 General requirements for testing
3.1 Number of tests
3.2 Repeatability and reproducibility
3.3 Expression of masses, volumes, factors and results
3.4 Blank determinations
4 Reagents
9 5 Apparatus
10 Figure 1 — Typical arrangement of filtration equipment
6 Preparation of a test sample of cement
11 7 Extraction procedure
7.1 Principle
7.2 Preparation of mortar
7.2.1 Composition of mortar
7.2.2 Mixing of mortar
12 7.3 Filtration
8 Determination of chromium (VI)
8.1 General
8.2 Measurement of absorbance without oxidation
8.2.1 Construction of the calibration curve
13 8.2.2 Sample absorbance
8.2.3 Determination of chromium (VI) concentration
8.3 Measurement of absorbance with oxidation
8.3.1 Construction of the calibration curve
8.3.1.1 Preparation of calibration solutions
8.3.1.2 Oxidation and measurement of absorbance
14 8.3.1.3 Plotting the calibration curve
8.3.2 Sample absorbance with oxidation
8.3.3 Determination of chromium (VI) concentration
9 Calculation and expression of results
9.1 Calculation
15 9.2 Expression of results
10 Reporting of results
11 Repeatability and reproducibility
16 Annex A (normative) Evaluation of the compliance of cement with the regulatory limit in 47 to Annex XVII of Regulation (EC) No. 1907/20062F on water-soluble hexavalent chromium content
A.1 Foreword
A.2 Scope
17 A.3 Normative references
A.4 Terms and definitions
18 A.5 Factory production control by the manufacturer
A.5.1 General requirements
A.5.2 Internal control
A.5.2.1 Process control
A.5.2.1.1 General
A.5.2.1.2 Reducing agent and composition of cement
A.5.2.1.3 Control of off-specification production
19 A.5.2.2 Measuring and testing
A.5.2.2.1 Inspection, measuring and test equipment
A.5.2.2.2 Inspection and test status
A.5.2.3 Handling, storage, packaging and delivery
A.5.3 Auto control testing of samples
A.5.3.1 General
A.5.3.2 Sampling, storage and testing
A.5.3.2.1 Sampling
A.5.3.2.2 Storage of samples before testing
20 A.5.3.2.3 Testing
A.5.3.3 Corrective action
A.6 Tasks for the verification body
A.6.1 General
A.6.2 Surveillance, assessment and acceptance of factory production control
A.6.2.1 Inspection tasks
A.6.2.2 Frequency of inspections
A.6.2.3 Reports
21 A.6.3 Evaluation of the results of auto control testing of samples
A.6.3.1 Evaluation tasks
A.6.3.2 Number and timing of evaluations
A.6.3.3 Control period
A.6.3.4 Evaluation of tests results
A.6.3.5 Reports
A.6.4 Audit testing of samples taken at the factory/depot
A.6.4.1 General
A.6.4.2 Sampling
22 A.6.4.3 Transportation and storage of samples before testing
A.6.4.4 Testing
A.6.4.5 Evaluation of tests results
A.6.4.6 Reports
A.6.4.7 Proficiency testing
A.7 Compliance criteria
A.7.1 General
A.7.2 Single result compliance criterion
23 A.8 Compliance assessment
A.8.1 General
A.8.2 Evaluation of test results
24 A.8.3 Evaluation of the implementation of the works’ quality manual
A.8.4 Evaluation of cement compliance and report
25 A.9 Actions in the event of non-compliance
A.9.1 Actions to be taken by the manufacturer
A.9.2 Actions to be taken by the verification body
A.10 Requirements for dispatching centres
26 Annex B (informative) Guidance on the application of this European Standard to the determination of the water soluble chromium (VI) content of cement-containing preparations
B.1 Background
B.2 Extraction procedure
27 B.3 Filtration procedure
B.4 Calculation and reporting of results
B.5 Evaluation of compliance
28 Annex C (informative) Guidance on screening test method (1) using paste extraction – method based on DS 1020
C.1 Object and field of application
C.2 Principle
C.3 Reagents
C.4 Apparatus
29 C.5 Procedure
C.5.1 Calibration
C.5.2 Analysis
30 C.6 Calculation of results
C.7 Reporting result
C.8 Precision and accuracy
C.9 Report
31 Annex D (informative) Guidance on screening test method (2) using paste extraction – method based on TRGS 613
D.1 Significance and use
D.2 Basic principles of the method
D.3 Apparatus
32 D.4 Materials
D.5 Construction of a calibration curve
D.5.1 General
D.5.2 Construction of a calibration curve with consideration of reducing substances
33 D.5.3 Construction of a calibration curve without consideration of reducing substances
D.6 Sample preparation and analysis
34 D.7 Evaluation and Interpretation
D.8 Health and safety
35 Annex E (informative) Guidance on the photometric determination of chromium reduction capacity in cements
E.1 Foreword
E.2 Summary
E.3 Scope
E.4 Apparatus
36 E.5 Reagents
37 E.6 Procedure
E.7 Calculations
38 E.8 Result
Table E.1 — Limits of increased concentration of the solutions
E.9 Control of instrument
39 Bibliography

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BS EN 196-10:2016
$167.15