Interlaboratory
Mostrando 1-12 de 178 artigos, teses e dissertações.
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1. Validation of an UHPLC-MS/MS Method for the Determination of Malachite Green, Leucomalachite Green, Crystal Violet, and Leucocrystal Violet in Shrimp, Fish, and Salmon Muscle Using a Modified QuEChERS Approach
A quantitative and confirmatory method for detecting the presence of triphenylmethane dyes in shrimp muscle using ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) and a quick, easy, cheap, effective, rugged and safe (QuEChERS) extraction approach was validated. The method exhibited linearity and selectivity and the coeffici
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. Validation of the Dual-path Platform chromatographic immunoassay (DPP® CVL rapid test) for the serodiagnosis of canine visceral leishmaniasis
BACKGROUND Visceral leishmaniasis is a major public health challenge in South America, and dogs are its main urban reservoir. OBJECTIVE Validation of the canine Dual-path Platform immunoassay for canine visceral leishmaniasis (DPP® CVL) for a sample set composed of 1446 dogs from different Brazilian endemic areas. METHODS A well-defined reference standard b
Mem. Inst. Oswaldo Cruz. Publicado em: 01/11/2018
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3. Method Development and Total Uncertainty Estimation for Boron, Sulfur and Phosphorus Determination in Mineral Fertilizer Using ICP OES
This study deals with B, S, and P determination in mineral fertilizer and S in commercial sulfur-formulation using inductively coupled plasma optical emission spectrometry. According to multivariate optimization using a Doehlert matrix, the analytes extraction in fertlizer can be conducted in open flask and heating on hot plate or in closed flask in microwav
J. Braz. Chem. Soc.. Publicado em: 2016-11
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4. Potency Evaluation of Recombinant Human Erythropoietin in Brazil: Assessment of Reproducibility Using a Practical Approach
In this study, we compared the results of potency determination of recombinant human erythropoietin (rhEPO) obtained between 2010 and 2012 by the National Institute of Quality Control in Health (INCQS/Fiocruz), i.e., the National Control Laboratory (NCL), and by a manufacturer of rhEPO. In total, 47 different batches of commercially prepared rhEPO (alpha iso
Braz. arch. biol. technol.. Publicado em: 01/05/2015
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5. ADAPTAÇÃO DA METODOLOGIA DE ANÁLISE DE METEMOGLOBINA COMO BIOMARCADOR DE EFEITO DA EXPOSIÇÃO AO AGROTÓXICO DIFLUBENZURON
This work aimed to adapt the analysis of methemoglobin recommended by Evelyn - Malloy (visible spectrophotometry), in order to facilitate its application in the field, or to analysis in clinical laboratory, of existing sites of diflubenzuron application. The parameters changed included: centrifuge rotation speed; time between the collection of biological sam
Quím. Nova. Publicado em: 2015-05
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6. Interlaboratory Comparison of Quantifying Hydrocarbons and Trace Elements in Sediment Samples from a Tropical Estuary
The Marine and Environmental Studies Laboratory at PUC-Rio, in partnership with the PETROBRAS R&D Center (Brazil), conducted an interlaboratory comparison of aliphatic and aromatic hydrocarbons and trace element determinations. The goal of this study was to produce a homogeneous and stable material and obtain consensus concentration values for its use as a r
J. Braz. Chem. Soc.. Publicado em: 2015-02
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7. Collaborative studies to evaluate the chemical composition of feeds / Estudos colaborativos para avaliação da composição química de alimentos
Objetivou-se conduzir estudos colaborativos para avaliação dos teores de matéria seca (MS), fibra em detergente neutro (FDN), proteína bruta (PB), extrato etéreo (EE), matéria mineral (MM) e fibra indigestível em detergente neutro (FDNi) e em detergente ácido (FDAi) em alimentos. Todos os sete laboratórios participantes do estudo pertenciam a instit
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2011
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8. Programa Interlaboratorial de Agregados e Misturas AsfÃlticas da Rede Asfalto N/Ne / Interlaboratory Program for Aggregates and Asphalt Mixture Characterizations within the Brazilian North-Northeast Asphalt Network
O trabalho apresenta o programa interlaboratorial de agregados e de misturas asfÃlticas da REDE ASFALTO N/NE, um arranjo de nove instituiÃÃes brasileiras coordenado pela Universidade Federal do Cearà (UFC). O objetivo do trabalho à a implantaÃÃo de um programa interlaboratorial para caracterizaÃÃo de agregados e dosagem de misturas asfÃlticas dentr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2010
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9. Parâmetros r e R obtidos de programa interlaboratorial: como usá-los
Intralaboratorial and interlaboratorial variabilities can be obtained by conducting an specially designed interlaboratory program. Using the analysis of variance technique one can calculate the r (repeatability) and R (reproducibility) indexes that can help participant laboratories to monitor their routine quality control procedures. An example is described
Química Nova. Publicado em: 2009
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10. Comparação de diferentes abordagens para avaliação da incerteza na cromatografia gasosa do gás natural
The evaluation of uncertainty associated with an analytic result is an essential part of the measurement process. Recently, several approaches to evaluate the uncertainty in measurement have been developed. Here, the gas chromatography assay uncertainty for natural gas is compared by some of these approaches: the guide to the expression of uncertainty in mea
Química Nova. Publicado em: 2009
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11. Certification reference material of iron ore by interlaboratory program / Certificado de material de referência de minério de ferro utilizando programa interlaboratorial
Brazil is one of the great worldwide iron ore producers and exports most of its production. In the international trade it is important to make sure the comparison of the analytical results among different laboratories. A variation of 0,1% in the average of the iron content can increase or decrease the value of a large ore shipment. Thus, the quality guarante
Publicado em: 2007
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12. PREPARATION, CARACTERIZATION AND CERTIFICATION OF URANIUM ISOTOPE REFERENCE MATERIALS / "Preparação, caracterização e certificação de materiais de referência isotópicos de urânio"
This work describes the preparation, characterization and certification of a set of uranium isotope reference materials ranging from 0.5 to 20.0 % of 235U in mass. The most important concepts of metrology in chemical measurements were applied so that the certified quantities in these materials could be directly traceable to the International System of Units
Publicado em: 2006