Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis
Abstract This study is focused on a proposal of a smartphone imaging-based quantification for providing a simple and rapid method for the analysis of chemical oxygen demand (COD) and color throughout the use of the HSV and/or RGB model in digital devices. For COD, calibration curves were done based...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-07-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-37126-9 |
| _version_ | 1797784699062452224 |
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| author | Jussara Câmara Cardozo Inalmar D. Barbosa Segundo Edney R. V. P. Galvão Djalma R. da Silva Elisama V. dos Santos Carlos A. Martínez-Huitle |
| author_facet | Jussara Câmara Cardozo Inalmar D. Barbosa Segundo Edney R. V. P. Galvão Djalma R. da Silva Elisama V. dos Santos Carlos A. Martínez-Huitle |
| author_sort | Jussara Câmara Cardozo |
| collection | DOAJ |
| description | Abstract This study is focused on a proposal of a smartphone imaging-based quantification for providing a simple and rapid method for the analysis of chemical oxygen demand (COD) and color throughout the use of the HSV and/or RGB model in digital devices. For COD, calibration curves were done based on the theoretical values of potassium biphthalate for a proper comparison between the spectrophotometer and the smartphone techniques. The smartphone camera and application attain an average accuracy higher than the analysis in the spectrophotometer (98.3 and 96.2%, respectively). In the color analysis, it was demonstrated that only the UV–vis bands measurement is not feasible to perform the real abatement of the dye in the water because the limiting concentration that allows obtaining a linear relationship in this equipment related to the dye concentration is about 10 mg L−1. Above this value, the spectrophotometer can not reach the real difference of color in the solution. Meanwhile, the smartphone method by using the camera reaches linearity until 50 mg L−1. From an environmental point of view, smartphones have been used for monitoring several organic and inorganic pollutants, however, no attempts have been published related to their use to evaluate the color and COD during wastewater treatment. Therefore, this investigation also aims to assess the utilization of these methods, for the first time, when high-colored water polluted by methylene blue (MB) was electrochemically treated by using a boron-dopped diamond (BDD) as the anode, with different current densities (j = 30, 45, 60, and 90 mA cm−2). COD and color abatement results clearly showed that different organic matter/color removal efficiencies were achieved, depending on the j used. All the results are aligned with the studies already available in the literature, with the total removal of color in 120 min of electrolysis with 60 and 90 mA cm−2, and almost 80% of COD abatement with the higher j. Moreover, samples of real effluent from beauty salons were compared, with standard deviation varying from only 3 to 40 mg O2 L−1, which is acceptable for COD values close to 2000. Finally, the methods here presented can be a great benefit for public water monitoring policies, since it is cheap and has a decentralized characteristic, given that smartphones are very common and portable devices. |
| first_indexed | 2024-03-13T00:43:37Z |
| format | Article |
| id | doaj.art-6f1e570144444d46841a2282d7989c10 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-13T00:43:37Z |
| publishDate | 2023-07-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj.art-6f1e570144444d46841a2282d7989c102023-07-09T11:10:39ZengNature PortfolioScientific Reports2045-23222023-07-0113111310.1038/s41598-023-37126-9Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysisJussara Câmara Cardozo0Inalmar D. Barbosa Segundo1Edney R. V. P. Galvão2Djalma R. da Silva3Elisama V. dos Santos4Carlos A. Martínez-Huitle5Renewable Energies and Environmental Sustainability Research Group, Institute of Chemistry, Federal University of Rio Grande do NorteRenewable Energies and Environmental Sustainability Research Group, Institute of Chemistry, Federal University of Rio Grande do NorteDepartament of Petroleum Engineering, Federal University of Rio Grande do NorteRenewable Energies and Environmental Sustainability Research Group, Institute of Chemistry, Federal University of Rio Grande do NorteRenewable Energies and Environmental Sustainability Research Group, Institute of Chemistry, Federal University of Rio Grande do NorteRenewable Energies and Environmental Sustainability Research Group, Institute of Chemistry, Federal University of Rio Grande do NorteAbstract This study is focused on a proposal of a smartphone imaging-based quantification for providing a simple and rapid method for the analysis of chemical oxygen demand (COD) and color throughout the use of the HSV and/or RGB model in digital devices. For COD, calibration curves were done based on the theoretical values of potassium biphthalate for a proper comparison between the spectrophotometer and the smartphone techniques. The smartphone camera and application attain an average accuracy higher than the analysis in the spectrophotometer (98.3 and 96.2%, respectively). In the color analysis, it was demonstrated that only the UV–vis bands measurement is not feasible to perform the real abatement of the dye in the water because the limiting concentration that allows obtaining a linear relationship in this equipment related to the dye concentration is about 10 mg L−1. Above this value, the spectrophotometer can not reach the real difference of color in the solution. Meanwhile, the smartphone method by using the camera reaches linearity until 50 mg L−1. From an environmental point of view, smartphones have been used for monitoring several organic and inorganic pollutants, however, no attempts have been published related to their use to evaluate the color and COD during wastewater treatment. Therefore, this investigation also aims to assess the utilization of these methods, for the first time, when high-colored water polluted by methylene blue (MB) was electrochemically treated by using a boron-dopped diamond (BDD) as the anode, with different current densities (j = 30, 45, 60, and 90 mA cm−2). COD and color abatement results clearly showed that different organic matter/color removal efficiencies were achieved, depending on the j used. All the results are aligned with the studies already available in the literature, with the total removal of color in 120 min of electrolysis with 60 and 90 mA cm−2, and almost 80% of COD abatement with the higher j. Moreover, samples of real effluent from beauty salons were compared, with standard deviation varying from only 3 to 40 mg O2 L−1, which is acceptable for COD values close to 2000. Finally, the methods here presented can be a great benefit for public water monitoring policies, since it is cheap and has a decentralized characteristic, given that smartphones are very common and portable devices.https://doi.org/10.1038/s41598-023-37126-9 |
| spellingShingle | Jussara Câmara Cardozo Inalmar D. Barbosa Segundo Edney R. V. P. Galvão Djalma R. da Silva Elisama V. dos Santos Carlos A. Martínez-Huitle Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis Scientific Reports |
| title | Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis |
| title_full | Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis |
| title_fullStr | Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis |
| title_full_unstemmed | Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis |
| title_short | Decentralized environmental applications of a smartphone-based method for chemical oxygen demand and color analysis |
| title_sort | decentralized environmental applications of a smartphone based method for chemical oxygen demand and color analysis |
| url | https://doi.org/10.1038/s41598-023-37126-9 |
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