Ensayo de aptitud realizado en LATU para validación del método de calibración y uso de pipetas de vidrio y pipetas automáticas

Authors

  • Claudia Santo Departamento de Metrología, Laboratorio Tecnológico del Uruguay (LATU), Uruguay
  • Pablo Constantino Departamento de Metrología, Laboratorio Tecnológico del Uruguay (LATU), Uruguay
  • Andrea Sica Departamento de Metrología, Laboratorio Tecnológico del Uruguay (LATU), Uruguay

DOI:

https://doi.org/10.26461/03.06

Abstract

In 2008 several chemical analysts from LATU’s test laboratories (most of them new to their task) took part in a Proficiency Test for the use of volumetric glassware. Two pipettes were used: a glass pipette of 1 ml, class B, and an automatic pipette of variable volume between 0 ml and 1 ml. The latter was calibrated at 1 ml. All analysts were asked to repeat each calibration between 6 and 10 times to allow an estimate of the measurement repeatibility. The average value performed by each analyst for each pipette was evaluated and its uncertainty estimated. Graphs are presented showing the analysts’ means and uncertainties for each pipette and the results are compared. As a conclusion, the reproducibility of each kind of instrument is evaluated according to which recommendations are given for the calibration and use of the two types of pipette.

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References

INTERNATIONAL ORGANIZATION FOR STANDARIZATION (Suiza). ISO/IEC 17025: General requirements for the competence of testing and calibration laboratories. Geneva: ISO, 2005.

INTERNATIONAL ORGANIZATION FOR STANDARIZATION (Suiza). ISO 9001: Quality management systems – requirements. Geneva: ISO, 2000.

INTERNATIONAL ORGANIZATION FOR STANDARIZATION (Suiza). ISO 4787: Laboratory glassware volumetric glassware - methods for use and testing of capacity. Geneva: ISO, 1984.

INTERNATIONAL ORGANIZATION FOR STANDARIZATION (Suiza). ISO 648: Laboratory glassware one-mark pipettes. Geneva: ISO, 1977.

INTERNATIONAL ORGANIZATION FOR STANDARIZATION (Suiza). ISO 13528: Statistical methods for use in proficiency testing by interlaboratory comparisons. Geneva: ISO, 2005. [Consulta: 20 de abril de 2008]. Disponible en:http://www.iso.org/iso/isocatalogue/catalogue_tc/catalogue_detail.htm?csnumber=35664

INTERNATIONAL ORGANIZATION FOR STANDARIZATION (Suiza). ISO/IEC Guide 43-1: Proficiency testing by interlaboratory comparisons – Part 1: Development and operation of proficiency testing schemes. Geneva: ISO, 1997.

How to Cite

Santo, C., Constantino, P., & Sica, A. (2011). Ensayo de aptitud realizado en LATU para validación del método de calibración y uso de pipetas de vidrio y pipetas automáticas. INNOTEC, (3 ene-dic), 40–43. https://doi.org/10.26461/03.06

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Articles