http://dx.doi.org/10.4322/sc.2011.009

 

Detecção em cromatografia gasosa rápida e cromatografia gasosa bidimensional abrangente

Pedroso, Marcio Pozzobon

Palavras-chave: Cromatografia gasosa, detectores, cromatografia gasosa rápida, cromatografia gasosa bidimensional abrangente.

Resumo: A cromatografia gasosa rápida e a cromatografia gasosa bidimensional abrangente apresentam, em comum, a geração de picos muito mais estreitos que em cromatografia gasosa convencional. A largura de base dos picos comumente observada nessas técnicas varia entre 1 s e 50 ms, podendo atingir valores tão pequenos quanto unidades de milissegundos. Com exceção do detector por ionização em chama e do espectrômetro de massas por tempo de voo, os demais detectores apresentam alguma limitação para a detecção de picos tão estreitos. Picos distorcidos ou com cauda e a baixa qualidade dos espectros de massas obtidos são os problemas mais observados. No presente trabalho, serão discutidas as características básicas dos detectores para cromatografia gasosa, bem como o uso deles para a detecção de picos estreitos.


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