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Biological and environmental reference materials in CENAM.

R Arvizu-Torres1, A Perez-Castorena, J A Salas-Tellez

  • 1Centro Nacional de Metrología, El Marquez, Querétaro, México.

Fresenius' Journal of Analytical Chemistry
|July 14, 2001
PubMed
Summary

Mexico's National Measurement Institute (CENAM) has developed biological and environmental reference materials. Proficiency testing schemes for water pollution and stack emissions have improved laboratory reliability and analytical capabilities.

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Area of Science:

  • Environmental Metrology
  • Chemical Measurement Science
  • Reference Material Development

Background:

  • Since 1994, CENAM (Mexico's National Measurement Institute) has focused on developing reference materials, supported by international collaborations like NORAMET and North-American Environmental Cooperation.
  • This development is crucial for enhancing the metrology program within the newly established CENAM.
  • Efforts are driven by the need for reliable analytical data in environmental monitoring and pollution control.

Purpose of the Study:

  • To describe CENAM's significant contributions to developing biological and environmental reference materials.
  • To evaluate the effectiveness of proficiency testing (PT) schemes in improving laboratory analytical capabilities.
  • To highlight the role of international collaboration in advancing reference material production and metrology.

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Main Methods:

  • Development of a proficiency testing (PT) scheme for field laboratories analyzing water pollution, aligned with Mexican Ecological Regulations.
  • Implementation of a PT scheme for reference gas mixtures to assess stack emission measurements.
  • Utilization of National Institute of Standards and Technology (NIST) Standard Reference Materials (SRMs) and inter-comparison studies.

Main Results:

  • Eight PTs over five years improved the analytical reliability of over 50 field laboratories in three Mexican states for water pollution analysis.
  • PT schemes for stack emissions successfully engaged 30 analytical laboratories in monitoring toxic substances (e.g., Hg, methylmercury, PCB).
  • International collaboration (NORAMET, SIM) helped overcome limitations in producing specific reference materials like biological tissues and marine sediments.

Conclusions:

  • CENAM's proficiency testing schemes have successfully enhanced the reliability of environmental laboratories in Mexico.
  • International collaboration is vital for NMIs to expand capabilities and achieve mutual recognition in metrology.
  • Continued efforts in preparing primary reference materials are essential for supporting environmental monitoring and research.