Espectrofotometria de longo caminho óptico em espectrofotô metro de duplo-feixe convencional: uma alternativa simples para investigações de amostras com densidade óptica muito baixa


Autoria(s): Galo, André Luiz; Colombo, Márcio Francisco
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

15/06/2009

Resumo

We describe the design and tests of a set-up mounted in a conventional double beam spectrophotometer, which allows the determination of optical density of samples confined in a long liquid core waveguide (LCW) capillary. Very long optical path length can be achieved with capillary cell, allowing measurements of samples with very low optical densities. The device uses a custom optical concentrator optically coupled to LCW (TEFLON® AF). Optical density measurements, carried out using a LCW of ̃ 45 cm, were in accordance with the Beer-Lambert Law. Thus, it was possible to analyze quantitatively samples at concentrations 45 fold lower than that regularly used in Spectrophotometric measurements.

Formato

488-492

Identificador

http://dx.doi.org/10.1590/S0100-40422009000200036

Quimica Nova, v. 32, n. 2, p. 488-492, 2009.

0100-4042

1678-7064

http://hdl.handle.net/11449/71037

10.1590/S0100-40422009000200036

S0100-40422009000200036

WOS:000265003900036

2-s2.0-66749126709

2-s2.0-66749126709.pdf

Idioma(s)

por

Relação

Química Nova

Direitos

openAccess

Palavras-Chave #Light concentrator #Liquid core waveguide (LCW) #Very long path length
Tipo

info:eu-repo/semantics/article