Analytisk kjemi

Komité: ISO/TC 334 (Reference materials)
Opprinnelse: ISO
Sluttdato: 15. feb 2023
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Komité: ISO/TC 201 (Surface chemical analysis)
Opprinnelse: ISO
Sluttdato: 6. mar 2023
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Komité: ISO/TC 76 (Transfusion, infusion and injection, and blood processing equipment for medical and pharmaceutical use)
Opprinnelse: ISO
Sluttdato: 6. mar 2023
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ISO 4802-1:2016 specifies:


a) a method for determining the hydrolytic resistance of the interior surfaces of glass containers when subjected to attack by water at 121 °C ± 1 °C for 60 min ± 1 min. The resistance is measured by titration of a known aliquot portion of the extraction solution produced with hydrochloric acid solution, in which case the resistance is inversely proportional to the volume of acid required;


b) a classification of glass containers according to the hydrolytic resistance of the interior surfaces determined by the methods specified in ISO 4802-1:2016.

Komité: ISO/TC 76 (Transfusion, infusion and injection, and blood processing equipment for medical and pharmaceutical use)
Opprinnelse: ISO
Sluttdato: 8. mar 2023
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ISO 4802-2:2016 specifies:


a) methods for determining the hydrolytic resistance of the interior surfaces of glass containers when subjected to attack by water at (121 ± 1) °C for (60 ± 1) min. The resistance is measured by determining the amount of sodium and other alkali metal or alkaline earth oxides in the extraction solution using flame atomic emission or absorption spectrometry (flame spectrometry);


b) a classification of glass containers according to the hydrolytic resistance of the interior surfaces determined by the methods specified in ISO 4802-2:2016.


The test method specified in ISO 4802-2:2016 might not be applicable to containers whose surfaces have been treated with silicon (e.g. containers that are ready for direct filling).

Komité: ISO/TC 334 (Reference materials)
Opprinnelse: ISO
Sluttdato: 16. mar 2023
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ISO/Guide 31:2015 is intended to help reference material (RM) producers in preparing clear and concise documentation to accompany an RM. It lists and explains mandatory, recommended and other categories of information to be considered in the preparation of product information sheets and RM certificates. This information can be used by RM users and other stakeholders in confirming the suitability of an RM or certified reference material (CRM).


ISO/Guide 31:2015 also contains the minimum requirements for a label attached to the RM container.



Komité: ISO/TC 334 (Reference materials)
Opprinnelse: ISO
Sluttdato: 21. mar 2023
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ISO Guide 33:2015 describes good practice in using reference materials (RMs), and certified reference materials (CRMs) in particular, in measurement processes. These uses include the assessment of precision and trueness of measurement methods, quality control, assigning values to materials, calibration, and the establishment of conventional scales. This Guide also relates key characteristics of various types of RMs to the different applications.


For CRMs, the metrological traceability of the property values to international scales or other measurement standards has been established. For RMs not being CRMs, this kind of traceability of property values has often not been established. Nevertheless, these RMs can still be used for assessing parts of measurement procedures, including evaluating various levels of precision


Mainstream applications of RM include precision control, bias assessment, calibration, preparation of calibration RMs and maintaining conventional scales.


NOTE Not all types of RMs can be used for all indicated purposes.


The preparation of RMs for calibration is also part of the scope of ISO Guides 34 and 35. The treatment in this Guide is limited to the fundamentals of small-scale preparation of RMs and the value assignment, as used by laboratories to calibrate their equipment. Larger scale production of such RMs, with the possible aim of distribution is beyond the scope of this Guide. This type of activity is covered in ISO Guides 34 and 35.


The development of working standards, as used in, e.g. natural gas analysis, clinical chemistry, and the pharmaceutical industry is not covered in this Guide. This type of activity is covered in ISO Guides 34 and 35.