DEVELOPMENT AND CERTIFICATION BY THE PRIMARY METHOD OF REFERENCE MATERIAL OF CONDUCTIVITY PRIMARY / DESENVOLVIMENTO E CERTIFICAÇÃO POR MÉTODO PRIMÁRIO DE MATERIAL DE REFERÊNCIA DE CONDUTIVIDADE PRIMÁRIA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Certified Reference Material (CRM) is a reference material, accompanied by documentation issued by an authoritative body and providing one or more specified property values with associated uncertainties and traceabilities, using valid procedures. The CRM are used for control and quality assurances of analytical results also are essential to calibrate instruments ensuring the traceability and reliability of results. Electrolytic conductivity is known as the ability of a solution to conduct electrical current. Traceability is a prerequisite for comparability and uniformity of measurements. In the case of electrolytic conductivity measurements on solutions, traceability is obtained through a primary system of conductivity that would lead to the CRM primary electrolytic conductivity. The CRM developed is low conductivity due to its importance in controlling the purity of water, raw material for production of medicines and vaccine, along with analysis of fuel ethanol. The studies of homogeneity, characterization and stability were carried out for CRM 5 uS.cm(-1) nominal value according to ISO 30 series. The result of studies of certification of the solution of electrolyte conductivity with its corresponding expanded uncertainty, with k = 2 for a confidence level (CL) of approximately 95% was (5.00 +- 0.16) uS.cm(-1) to 25 °C. The development and certification of primary reference material will contribute to the quality of the results of electrolytic conductivity measurements performed in various laboratories in Brazil and South America, which will guarantee the traceability and reliability of measurement results, especially when is related to monitoring purity of water and analysis of fuel ethanol.

ASSUNTO(S)

sistemas de medicao eletrolytic conductivity measurement systems normas rules condutividade eletrolitica rastreabilidade traceability

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