Search Results - "CAMOES, M. Filomena G. F. C"
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Carotenoid stability in fruits, vegetables and working standards – Effect of storage temperature and time
Published in Food chemistry (01-08-2014)“…•The freezing and storage effects (−20 and −70°C) on carotenoids in food were evaluated through a HPLC method.•Carotenoids in food matrices did not show…”
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2
Development of metrological models for internal standard single-point and multi-point calibrations for the assessment of tear gas weapons compliance with legislation
Published in Accreditation and quality assurance (01-04-2012)“…Tear gases are the most widely used non-lethal weapons, both by security forces and by the general public. The pepper spray, whose active agent is capsaicin,…”
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3
Evaluation of the sampling procedure adopted by the EU pesticide residue control programme to assess consumer exposure to high acute toxicity pesticides: Methamidophos in sweet peppers
Published in Accreditation and quality assurance (01-05-2002)“…Food chemical control, particularly control involving the analysis of pesticide residues in fruits and vegetables, is routinely performed on composite samples…”
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Conference Proceeding Journal Article -
4
Optimization of the determination of chemical oxygen demand in wastewaters
Published in Analytica chimica acta (12-08-2011)“…Variation of the percentage contribution, P j , of the major uncertainty components, of the measurement expanded uncertainty ( U) and of the target measurement…”
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Validation, Uncertainty, and Quality Control of Qualitative Analysis of Tear Gas Weapons by Gas Chromatography-Mass Spectrometry
Published in Analytical letters (22-01-2014)“…The reliability of the identification/examination of compounds by gas chromatography hyphenated with mass spectrometry (GC-MS) can be significantly affected by…”
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Uncertainty estimation and in-house method validation of HPLC analysis of carotenoids for food composition data production
Published in Food chemistry (15-08-2008)“…The method for separation and quantitative determination of the main carotenoids in food by high-performance liquid chromatography (HPLC) was in-house…”
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7
Assessment of the determination of water-soluble ionic composition of atmospheric aerosols from the analysis of crossed halves of filters
Published in Accreditation and quality assurance (01-04-2012)“…The water-soluble ionic composition of atmospheric aerosols is a key parameter for estimating its anthropogenic or natural origin. This evaluation depends on…”
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Quantification of analytes affected by relevant interfering signals under quality controlled conditions
Published in Analytica chimica acta (31-05-2006)“…The analysis of organic contaminants or residues in biological samples is frequently affected by the presence of compounds producing interfering instrumental…”
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Designing valid and optimised standard addition calibrations: Application to the determination of anions in seawater
Published in Talanta (Oxford) (01-09-2015)“…A strategy for designing valid standard addition calibrations and for optimising their uncertainty is presented. The design of calibrations involves the…”
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Weighted calibration with reduced number of signals by weighing factor modelling: Application to the identification of explosives by ion chromatography
Published in Analytica chimica acta (04-12-2013)“…•Reliable linear weighted calibrations, based in reduced number of signal, are performed.•Simplification of weighted calibrations is based in prior models of…”
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11
Evaluation of the performance of the determination of anions in the water soluble fraction of atmospheric aerosols
Published in Talanta (Oxford) (30-01-2013)“…The knowledge of the mass of particulate matter in air, its chemical composition and emission sources is of relevance for taking decisions concerning air…”
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12
Critical assessment of three high performance liquid chromatography analytical methods for food carotenoid quantification
Published in Journal of Chromatography A (21-05-2010)“…Three sets of extraction/saponification/HPLC conditions for food carotenoid quantification were technically and economically compared. Samples were analysed…”
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13
Carotenoids in traditional Portuguese fruits and vegetables
Published in Food chemistry (01-04-2009)“…Carotenoids, α-carotene, β-carotene, β-cryptoxanthin, lycopene, lutein and zeaxanthin, were determined in 10 varieties of five fruit species (orange, pear,…”
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14
Evaluation of the analytical method performance for incurred samples
Published in Analytica chimica acta (06-06-2003)“…A methodology for the evaluation of the performance of an analytical method for incurred samples is presented. Since this methodology is based on…”
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15
Reassessment of pH reference values with improved methodology for the evaluation of ionic strength
Published in Analytica chimica acta (21-02-2005)“…The conflict between pH as empirical number in routine control and the pH value regarded as conveying some information concerning the effective concentration…”
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Evaluation of sample processing and sub-sampling performance
Published in Analytica chimica acta (03-02-2003)“…A methodology for the estimation of sample processing and sub-sampling performance based on the comparison of the global method experimental dispersion of…”
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17
Effect of citrate impurities on the reference pH value of potassium dihydrogen buffer solution
Published in Analytica chimica acta (10-04-2003)“…Solutions of potassium dihydrogen citrate, KH 2C 6H 5O 7, exhibit reference pH values close to those of the primary standard pH buffer solutions of tartrate…”
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Validation of the uncertainty evaluation for the determination of metals in solid samples by atomic spectrometry
Published in Accreditation and quality assurance (01-04-1998)“…Every analytical result should be expressed with some indication of its quality. The uncertainty as defined by Eurachem ("parameter associated with the result…”
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Conference Proceeding Journal Article