| Texto completo | |
| Autor(es): |
Segundo, Inalmar D. Barbosa
;
Cardozo, Jussara C.
;
Castro, Pollyana Souza
;
Gondim, Amanda D.
;
dos Santos, Elisama V.
;
Martinez-Huitle, Carlos A.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | METHODSX; v. 11, p. 6-pg., 2023-12-01. |
| Resumo | |
Aiming the decentralization of monitoring policies and to facilitate the work of researchers, mainly in developing countries, the present method deals with the explanation of a simple and rapid protocol for chemical oxygen demand (COD) analysis through the use of digital smartphone devices coupled with a camera and a free app available for Android operating system that recog-nizes HSV (hue, saturation, value). The calibration of the method is done based on the theoretical values of potassium hydrogen phthalate for a proper and reliable build of the calibration curve by using the smartphone-based technique and the digested samples of COD. The coefficient of determination (R 2 ) attained a value upper than 0.99, providing a high confidence levels, and the method achieved 97% of average accuracy in samples with COD values ranging from 0 to 150 mg L -1. Finally, the procedure here presented can be a great support for scientific laboratories and monitoring policies, once it can efficiently substitute expensive spectrophotometers and can im-prove and ensure the sustainable management of water sanitation, which is one of the sustainable goals proposed by the United Nations. & BULL; COD measurements, based on the use of a simple smartphone with a camera, can be a promis-ing way for environmental analysis when spectrophotometers are not available, such as de-centralized approaches. & BULL; The use of smartphone protocol is a novel initiative to fulfill sustainable development goal 6 on clean water and sanitation. & BULL; The smartphone is capable to read the difference of HSV values efficiently and can substitute the use of expensive spectrophotometers. (AU) | |
| Processo FAPESP: | 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos |
| Beneficiário: | Maria Valnice Boldrin |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/13113-4 - Processos foto (eletro) catalíticos e fotoeletro-fenton para eliminar contaminantes emergentes de águas de rejeito industriais |
| Beneficiário: | Maria Valnice Boldrin |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |