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Voltametria de chumbo em cortiça

Authors: Sousa, João Carlos Araújo de Carvalho Caldeira da Ponte e;

Voltametria de chumbo em cortiça

Abstract

É mostrado o teor médio conhecido de cinzas e metais em cortiça amadia, bem como o desvio-padrão e o número de referências bibliográficas. Nomeadamente de: Ca, K, Al, P, Na, Fe, Mg, Mn, Cu, Zn, Pb, Cr e Cd. De destacar (20ppm±20ppm; 5) para Pb. Foi criado um novo método quimiométrico para análise de dados, aplicado à voltametria-de-redissolução-anódica-de-impulso-diferencial. O novo método produziu uma incerteza expandida de ±0.3321ppm (ca. 1.42 %). A diferença entre os resultados do novo e do anterior método foi de 0.01ppm (23.41 e 23.40ppm). O limite-dedetecção mudou de aproximadamente 4.8 para 4ppm e o desvio-padrão-relativo aproximadamente de 9 para 6%. A voltametria-de-redissolução-anódica-de-impulso-diferencial permitiu obter, para o chumbo, o resultado de 52.85ppm±41.63ppm (77.36%) ou 32.00ppm±12.16ppm (37.98%), estudadas duas amostras de cortiça. Foi feita a optimização paramétrica e comparação com a espectrometria de absorção atómica; ### ABSTRACT: It is shown the known average concentration of ashes and metals in reproduction cork, as well as the standard-deviation and the number of bibliographic references. Namely of: Ca, K, Al, P, Na, Fe, Mg, Mn, Cu, Zn, Pb, Cr and Cd. A remark is made to (20ppm±20ppm; 5) for Pb. A new chemometric method was created for data analysis, applied to differential-pulse-anodic-stripping-voltammetry. The new method produced an expanded uncertainty of ±0.3321ppm (ca. 1.42 %). The difference between the new and old method results was 0.01ppm (23.41 and 23.40ppm). The limit-of-detection changed from approximately 4.8 for 4ppm and the relative-standard-deviation approximately from 9 to 6%. The differential-pulse-anodic-stripping-voltammetry allowed to have, for lead, the result of 52.85ppm±41.63ppm (77.36%) or 32.00ppm±12.16ppm (37.98%), after the study of two cork samples. The parametric optimization was made and atomic absorption spectrometry was used for comparison.

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Portugal
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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