SciELO - Scientific Electronic Library Online

 
vol.31 número3O espaço da prática de ensino e do estágio curricular nos cursos de formação de professores de química das ies públicas paulistasDemonstrando os fundamentos, potencialidades e limitações da análise por injeção seqüencial índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Química Nova

versão impressa ISSN 0100-4042

Resumo

LIMA, Kássio M. G.; TREVISAN, Marcello G.; POPPI, Ronei J.  e  ANDRADE, João Carlos de. Non-destructive determination of total nitrogen in plants by diffuse reflectance near infrared spectroscopy. Quím. Nova [online]. 2008, vol.31, n.3, pp. 700-703. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422008000300039.

Diffuse reflectance near-infrared (DR-NIR) spectroscopy associated with partial least squares (PLS) multivariate calibration is proposed for a direct, non-destructive, determination of total nitrogen in wheat leaves. The procedure was developed for an Analytical Instrumental Analysis course, carried out at the Institute of Chemistry of the State University of Campinas. The DR-NIR results are in good agreement with those obtained by the Kjeldhal standard procedure, with a relative error of less than ± 3% and the method may be used for teaching purposes as well as for routine analysis.

Palavras-chave : total nitrogen; near-infrared diffuse reflectance; teaching activity.

        · texto em Português     · pdf em Português