Compatibility of activity coefficients estimated experimentally and by Pitzer equations for the assessment of seawater pH
ACCREDITATION AND QUALITY ASSURANCE, 21, 1-7 1 2016
Barbara Anes , Ricardo Bettencourt da Silva , Hugo F. P. Martins , Cristina S. Oliveira , M.Filomena Camões

Designing valid and optimised standard addition calibrations: Application to the determination of anions in seawater
TALANTA, 142, 72-83 9 2015
Joana Rodrigues , Ricardo Bettencourt da Silva , M. Filomena , G. F. C. Camoes , Cristina M. Oliveira

Validation of atmospheric aerosols parallel sampling in a multifold device
ENVIRONMENTAL MONITORING AND ASSESSMENT, 187, 6 2015
Cristina M. Oliveira , M.Filomena Camões , P. Bigus , A. A. Fachado , Ricardo Bettencourt da Silva

Eurachem workshop on quality in analytical measurements: from specification to decision
ACCREDITATION AND QUALITY ASSURANCE, 20, 43-46 2 2015
Ricardo Bettencourt da Silva , Alex Williams

A summer school where master students learn the skills needed to work in an accredited analytical laboratory
ANALYTICAL AND BIOANALYTICAL CHEMISTRY, 407, 6899-6907 9 2015
Philip D. P. Taylor , Danuta Baralkiewicz , Ricardo Bettencourt da Silva , Darinka Brodnjak Voncina , Ewa Bulska , Maria Filomena Camoes , Ryszard Dobrowolski , Marc Elskens , Ivo Leito , Nineta H. Majcen , Petko Mandjukov , Josephine McCourt , Jerome Randon , Paavo Peramaki

Assessment of the determination of heavy metals in organic soil improvers by ICP-OES
ACCREDITATION AND QUALITY ASSURANCE, 19, 87-97 4 2014
Ana G. Correia , Ricardo Bettencourt da Silva , Filipe Pedra , M. Joao Nunes

VALIDATION, UNCERTAINTY, AND QUALITY CONTROL OF QUALITATIVE ANALYSIS OF TEAR GAS WEAPONS BY GAS CHROMATOGRAPHY-MASS SPECTROMETRY
ANALYTICAL LETTERS, 47, 250-267 1 2014
Ricardo Bettencourt da Silva , Daniel M. Silveira , M.Filomena Camões , Carlos M. F. Borges , Pedro A. S. Salgueiro

Weighted calibration with reduced number of signals by weighing factor modelling: Application to the identification of explosives by ion chromatography
ANALYTICA CHIMICA ACTA, 804, 287-295 12 2013
Beatriz Brasil , Ricardo Bettencourt da Silva , M.Filomena Camões , Pedro A. S. Salgueiro

Setting Target Measurement Uncertainty in Water Analysis
WATER, 5, 1279-1302 9 2013
Ricardo Bettencourt da Silva

Can Semi-empirical Calculations Help Solve Mass Spectrometry Problems? Protonation Sites and Proton Affinities of Amino Acids
CHEMPLUSCHEM, 78, 1149-1156 9 2013
Paulo J. Amorim Madeira , P. D. Vaz , Ricardo Bettencourt da Silva , M. Helena Florencio

Evaluation of the performance of the determination of anions in the water soluble fraction of atmospheric aerosols
TALANTA, 104, 10-16 1 2013
Alejandro Arias , Ricardo Bettencourt da Silva , M.Filomena Camões , Cristina M. Oliveira

Development and validation of a grouping method for pesticides analysed in foodstuffs
FOOD CHEMISTRY, 134, 2291-2302 10 2012
Ricardo Bettencourt da Silva , Pedro M. V. B. F. Dias , M.Filomena Camões

Valid internal standard technique for arson detection based on gas chromatography-mass spectrometry
JOURNAL OF CHROMATOGRAPHY A, 1257, 189-194 9 2012
Pedro A. S. Salgueiro , Carlos M. Borges , Ricardo Bettencourt da Silva

Development of metrological models for internal standard single-point and multi-point calibrations for the assessment of tear gas weapons compliance with legislation
ACCREDITATION AND QUALITY ASSURANCE, 17, 115-127 4 2012
Daniel M. Silveira , Pedro A. S. Salgueiro , M.Filomena Camões , Ricardo Bettencourt da Silva

Assessment of the determination of water-soluble ionic composition of atmospheric aerosols from the analysis of crossed halves of filters
ACCREDITATION AND QUALITY ASSURANCE, 17, 147-157 4 2012
Ricardo Bettencourt da Silva , Alejandro Arias , Cristina M. Oliveira , M.Filomena Camões

Optimization of the determination of chemical oxygen demand in wastewaters
ANALYTICA CHIMICA ACTA, 699, 161-169 8 2011
Alexandra M. E. Viana da Silva , Ricardo Bettencourt da Silva , M.Filomena Camões

Detailed uncertainty budget for major and minor ions in stock combined calibration standards-Influence of impurities in chemicals
ANALYTICA CHIMICA ACTA, 659, 85-92 2 2010
Natasa Gros , M.Filomena Camões , Ricardo Bettencourt da Silva

THE QUALITY OF STANDARDS IN LEAST SQUARES CALIBRATIONS
ANALYTICAL LETTERS, 43, 1257-1266 2010
Ricardo Bettencourt da Silva , M.Filomena Camões

UNCERTAINTY BUDGET FOR SIMULTANEOUS DETERMINATION OF MINOR AND MAJOR IONS IN SEAWATER WITH ION CHROMATOGRAPHY CONFRONTED WITH UNCERTAINTIES IN CONCENTRATIONS OF CALIBRATION STANDARDS
ANALYTICAL LETTERS, 43, 1317-1329 2010
Natasa Gros , M.Filomena Camões , Ricardo Bettencourt da Silva

Comparability of measurement results for pesticide residues in foodstuffs: an open issue?
ACCREDITATION AND QUALITY ASSURANCE, 15, 691-704 12 2010
Ricardo Bettencourt da Silva , M.Filomena Camões