Kemiteknik

This document explains concepts and provides approaches to the following aspects of the production of reference materials:
— the assessment of homogeneity;
— the assessment of stability and the management of the risks associated with possible stability issues related to the properties of interest;
— the characterization and value assignment of properties of a reference material;
— the evaluation of uncertainty for certified values;
— the establishment of the metrological traceability of certified property values.
The guidance given supports the implementation of ISO 17034. Other approaches may also be used as long as the requirements of ISO 17034 are fulfilled.
Brief guidance on the need for commutability assessment (6.11) is given in this document, but no technical details are provided. A brief introduction for the characterization of qualitative properties (9.6 to 9.10) is provided together with brief guidance on sampling such materials for homogeneity
tests (Clause 7). However, statistical methods for the assessment of the homogeneity and stability of reference materials for qualitative properties are not covered. This document is also not applicable to multivariate quantities, such as spectral data.
Note ISO 33406 gives more information on the production of reference materials with one or more qualitative property values.

1.1 This document gives guidance on the production of RMs having one or more assigned qualitative property values. Qualitative properties, also called categorical properties, can be nominal or ordinal. A nominal property has values that partition the set of materials that have it into classes such that all the materials in the same class have the same value of the property, and the only comparison that can be made between values of the property is of whether they are identical or different. An ordinal property is similar, except that the comparisons that can be made between two values of the property are of relative rank order; that is, whether one is lower, equal to, or higher than the other. This document focuses on nominal properties.
1.2 This document gives specific guidance on the production of RMs having one or more assigned qualitative property values, including ways to express related uncertainties and to establish traceability.
NOTE The concepts of traceability and uncertainty address characteristics similar to those addressed by the concepts of traceability and measurement uncertainty as used in the metrology of quantitative properties.
NOTE RMs of pure substances for which a quantitative purity value is assigned should be prepared in accordance with the recommendations for quantitative properties in ISO Guide 35[2].
1.3 This document supplements ISO 17034 (General requirements for the competence of reference material producers)[7] and related ISO Guides such as ISO Guide 35 (Reference materials —Guidance
for characterization and assessment of homogeneity and stability).[2] While ISO Guide 35 provides some guidance on the production of RMs with qualitative property values, Guide 35 and ISO 17034 primarily focus on the production of RMs with quantitative property values. ISO 33406 therefore does not describe aspects related to the production of RMs with quantitative property values.
NOTE Annex A provides examples of types of reference materials within the scope of this document.
 

This International Standard specifies the minimum requirements for rubber hoses used for transferring ammonia, in liquid or in gaseous form, at ambient temperatures from −40 °C up to and including +55 °C at a working pressure of 2,5 MPa (25 bar). It does not include specifications for end fittings, but is
limited to the performance of the hoses and hose assemblies.

This International Standard gives advice on how to generate reliable and reproducible crystallographic orientation measurements using electron backscatter diffraction (EBSD). It addresses the requirements for specimen preparation, instrument configuration, instrument calibration and data acquisition.

This document is applicable to ammonia solution used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements of ammonia solution and refers to the corresponding analytical methods. It gives information for its use in water treatment. It also determines the rules relating to safe handling and use of ammonia solution (see Annex B).

This document specifies a test method and the minimum requirements for fungicidal or yeasticidal activity of chemical disinfectant and antiseptic products that form a homogeneous, physically stable preparation when diluted with hard water or — in the case of ready-to-use-products — with water. Products can only be tested at a concentration of 80 % or less, as some dilution is always produced by adding the test organisms and interfering substance.
This document applies to products that are used in the veterinary area – i.e. in the breeding, husbandry, production, transport and disposal of all animals except when in the food chain following death and entry to the processing industry.
EN 14885 specifies in detail the relationship of the various tests to one another and to “use recommendations”.
NOTE 1 The method described is intended to determine the activity of commercial formulations or active substances under the conditions in which they are used.
NOTE 2 This method corresponds to a phase 2 step 1 test.

This document is applicable to glass beads and glass granulate intended for treatment of water for human consumption, swimming pool and/or spa water. It solely describes the characteristics of glass beads and glass granulate and specifies the requirements and the corresponding test methods for glass beads and glass granulate.
General information on glass beads and glass granulate is provided in Annex A. General rules relating to safety are provided in Annex B.

This International Standard gives the general guidelines for the determination of experimental parameters relating to the electron probe, the wavelength spectrometer, and the specimen that need to be taken into account when carrying out electron probe microanalysis. It also defines procedures
for the determination of probe current, probe diameter, dead time, wavelength resolution, background, analysis area, analysis depth, and analysis volume.
This International Standard is intended for the analysis of a well-polished specimen using normal beam incidence.
This International Standard is not designed to be used for energy dispersive X-ray spectroscopy.

This document is applicable to aluminium-based coagulants used for treatment of water intended for human consumption. It specifies analytical methods to be used for products described in EN 878, EN 882, EN 885, EN 886, EN 887, EN 935 and EN 17034.