Metode ispitivanja cementa - Deo 10: Određivanje sadržaja hroma rastvorljivog u vodi (VI), u cementu

Methods of testing cement - Part 10: Determination of the water-soluble chromium (VI) content of cement

Ovim standardom utvrđuje se metoda za određivanje sadržaja hroma rastvorljivog u vodi. Opisana referentna metoda se sastoji od dve faze: procesa ekstrakcije i analize filtrata. Dato je uputstvo i za druge postupke ekstrakcije, pogodne za za fabričku kontrolu proizvodnje ili druge svrhe, ali u slučaju spora ili neusaglašenosti sa propisanim granicama koristi se samo referentna metoda. Referentna metoda ima alternative, jer se filtrat može izložiti oksidaciji ili ne. Definisan je kriterijum po kome se bira odgovarajući postupak.

This European Standard 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 Directive 2003/53/EC. This European Standard 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.

cement;metoda ispitivanja;određivanje;hrom rastvoran u vodi;uzimanje uzoraka; izveštaj o ispitivanju