Sensorial system to detect chloroform in water

被引:13
作者
Carvalho, Eduarda R.
Consolin Filho, Nelson
Firmino, Alessandra
Oliveira, O. N., Jr.
Mattoso, Luiz Henrique C.
Martin-Neto, Ladislau
机构
[1] Embrapa Instrumentacao Agropecuaria, BR-13560970 Sao Carlos, SP, Brazil
[2] Univ Sao Paulo, PPG Interunidades Ciencias & Engn Mat, Sao Carlos, SP, Brazil
关键词
sensors; conducting polymers; drinking water; carcinogenic by-products; chloroform;
D O I
10.1166/sl.2006.023
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A sensor system adapted to detect chloroform, a potentially carcinogenic compound, in water was fabricated and tested. Interdigitated gold-coated microelectrodes were covered with various conducting polymers, single, or mixed, under several different conditions, and the resulting sensors characterized and tested on the analyte in question. Polymer films were laid down by a self-assembly technique and their impedance was analyzed over a range of frequencies from 1 Hz to 1 MHz. For practical reasons, the capacitance was also measured, at a fixed frequency of 1000 Hz, which allowed data-acquisition to be simplified. Some of the systems tested were able to detect chloroform in water and to distinguish different concentrations, the detection limit being of the order of 0.01 mg L-1. These results demonstrate the sensitivity of conducting polymers and show that they can be used in the fabrication and assembly of a sensor system capable of detecting by-products of water disinfection, such as chloroform, that exhibit carcinogenic properties.
引用
收藏
页码:129 / 134
页数:6
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