Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/68190
Título: | A low-cost lab-on-a-chip device for marine pH quantification by colorimetry |
Autor(es): | Pinto, Vânia Cristina Gonçalves Araújo, Catarina Sousa, P. J. Gonçalves, L. M. Minas, Graça |
Palavras-chave: | Lab-on-a-chip pH sensor Colorimetry Seawater |
Data: | 2019 |
Editora: | Elsevier Science BV |
Revista: | Sensors and Actuators B: Chemical |
Resumo(s): | This paper presents a novel lab-on-a-chip for seawater pH measurement that features in-situ, autonomous, long-term and low-cost measurements. It comprises a poly(dimethylsiloxane) microfluidic system and an integrated low-cost optical-electronic system that uses light emitting diodes as light source and photodiodes as the detectors. The pH measurement is based on the colorimetric method, by optical absorption, using the meta-Cresol Purple (mCP) as indicator dye. Only 9.6 mu L of this mCP is needed to perform the pH measurement. Under the developed optimized conditions presented here, e.g., microfluidic channels geometry, indicator dye and seawater volumes, the device has a resolution of 0.002 pH units for the 7.500-8.200 seawater pH units range, with a significantly reduction of the optical path length to 5 mm and a total detection time of about 8 min. The lab-on-a-chip features high sensitivity, linearity and reproducibility. This approach will allow, in the future, the lab-on-a-chip to be moored in a submerged base, located in the depth of the ocean due to its inherent pressure independent operability, in opposition to conventional electrochemical methodologies. |
Tipo: | Artigo |
Descrição: | Supplementary material related to this article can be found, in the online version, at doi:https://doi.org/10.1016/j.snb.2019.03.098. |
URI: | https://hdl.handle.net/1822/68190 |
DOI: | 10.1016/j.snb.2019.03.098 |
ISSN: | 0925-4005 |
Versão da editora: | https://www.sciencedirect.com/science/article/abs/pii/S0925400519304551 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CMEMS - Artigos em revistas internacionais/Papers in international journals DEI - Artigos em revistas internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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S&A-B-labchip-pH-2019.pdf Acesso restrito! | 1,87 MB | Adobe PDF | Ver/Abrir |