| Full text | |
| Author(s): |
Carvalho‚ E.R.
;
Consolin Filho‚ N.
;
Venancio‚ E.C.
;
Mattoso‚ L.H.
;
Martin-Neto‚ L.
;
others
Total Authors: 6
|
| Document type: | Journal article |
| Source: | SENSORS; v. 7, n. 12, p. 3258-3271, 2007. |
| Abstract | |
The detection of the carcinogenic trihalomethanes (THM) in public water supply systems using low-cost equipment has become an essential feature, since these compounds may be generated as by-products of water-treatment processes. Here we report on a sensor array that extends the concept of an "electronic tongue" to detect small amounts of bromoform, bromodichloromethane and dibromochloromethane, with detection limits as low as 0.02 mg L-1. The sensor array was made up of 10 sensing units, in which nanostructured films of conducting and natural polymers were deposited onto gold interdigitated electrodes. The principle of detection was impedance spectroscopy, with measurements carried out in the range between 1 Hz to 1 MHz. Using data at 1 kHz, at which the electrical response varied considerably by changing the analyte, we demonstrated with principal component analysis (PCA) that samples with the 3 brominated trihalomethanes can be distinguished from each other and for various concentrations. (AU) | |
| FAPESP's process: | 06/58872-0 - Identificação e monitoramento de matéria orgânica dissolvida de origem cianobacterial empregando impedância elétrica |
| Grantee: | Nelson Consolin Filho |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 01/13745-7 - Development of polymeric sensor for applications in agribusiness and environment |
| Grantee: | Luiz Henrique Capparelli Mattoso |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 06/60767-0 - Desenvolvimento de um sistema sensorial de baixo custo para determinacao e deteccao de compostos cancerigenos em estacoes de tratamento de agua e efluentes de esgotos. |
| Grantee: | Eduarda Regina Carvalho |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |