An inexpensive, portable and microcontrolled near infrared LED-photometer for screening analysis of gasoline

被引：38

作者：

Gaiao, Edvaldo da Nobrega ^{[1
]}

Bezerra dos Santos, Sergio Ricardo ^{[1
]}

dos Santos, Vagner Bezerra ^{[1
]}

Lima do Nascimento, Elaine Cristina ^{[1
]}

Lima, Renato Sousa ^{[1
]}

Ugulino de Araujo, Mario Cesar ^{[1
]}

机构：

[1] Univ Fed Paraiba, Dept Quim, CCEN, BR-58051970 Joao Pessoa, Paraiba, Brazil

来源：

TALANTA | 2008年 / 75卷 / 03期

关键词：

near infrared; light emitting diode; photometer; microcontroller; screening analysis; gasoline;

D O I：

10.1016/j.talanta.2007.12.014

中图分类号：

O65 [分析化学];

学科分类号：

070302 [分析化学]; 081704 [应用化学];

摘要：

A microcontrolled, portable and inexpensive photometer is proposed. It uses a near infrared light emitting diode (NIR LED) as radiation source, a PbSe photoresistor as infrared detector and a programmable interrupt controller (PIC) microcontroller as control unit. The detector system presents a thermoresistor and a thermoelectric cooling to control the detector temperature and keep the noise at low levels. The microcontroller incorporated total autonomy on the proposed photometer. As its components are inexpensive and of easy acquisition, the proposed NIR LED-photometer is an economical alternative for chemical analyses in small routine, research and/or teaching laboratories. By being portable and microcontrolled, it also allows carrying out field chemical analyses. The instrument was successfully applied on the screening analysis to verify adulteration in gasoline samples. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：792 / 796

页数：5

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