Desenvolvimento de um dispositivo de baixo custo para medidas por quimiluminescência

Química Nova

Eduardo P. Borges²  Elizabeth N. Fernandes²  Fábio R. P. Rocha²  Boaventura F. Reis¹ 

[1] ,Universidade Federal de São Carlos Departamento de Química São Carlos SP

关键词: flow analysis;    chemiluminescence;    hydrogen peroxide;    photodiode;   

DOI  :  10.1590/S0100-40422002000700021

来源: SciELO

【 摘 要 】

A simple and low cost device (ca. US$ 150) that comprises two photodiodes fixed in lab-made Perspex flow cell is proposed for chemiluminescence measurements. The characteristics of the device (large observation window and reduced thickness) allow maximizing the amount of the emitted radiation detected. A sensitivity improvement of ca. 50 % was observed by employing two photodiodes for signal measurements. The performance of the device was assessed by the oxidation of luminol by hydrogen peroxide, yielding a linear response within the range of 2.50 to 500 µmol L-1 H2O2. The detection limit was estimated as 0.8 µmol L-1 hydrogen peroxide which is comparable with those obtained by using equipments based on photomultipliers.

【 授权许可】

CC BY-NC   
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