Determinação de íons nitrito na água de dez lagoas da região metropolitana de Natal
The United Nations Organizations created the 2030 Agenda, a transforming plan where its countries membership commit to promote sustainable development by searching 17 objectives. One of them, objective 6 - Drinking water and sanitation, inspired this project. The disorderly growth of cities and the...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/35709 |
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| Resumo: | The United Nations Organizations created the 2030 Agenda, a transforming plan where its countries membership commit to promote sustainable development by searching 17 objectives. One of them, objective 6 - Drinking water and sanitation, inspired this project. The disorderly growth of cities and the low levels of basic sanitation can cause contamination of subterranean, rivers and lakes water. Natal city is supplied by eight capture systems, where five of these systems do not comply with potability standards for nitrate ions. An indication of water contamination is a high concentration of nitrite that comes from the reduction of nitrate by microorganisms. Acute exposure to nitrite ions is associated with induction of methemoglobinemia and chronic exposure may be associated with the formation of carcinogenic nitrosamines. Quantification of nitrite is not common in treated water, due to the chlorination process, which converts nitrite into nitrate. Water samples from ten lakes in the metropolitan region were analyzed using molecular absorption spectrophotometry technique. From the analyzed samples, only four had nitrite concentrations sufficient to be detected and quantified by the employed methodology. The respective values obtained from Carcará, Extremoz, Jiqui and Pitangui lagoons were 0.0114, 0.0090, 0.0156 and 0.0335 µg/mL, respectively. The results obtained were all in accordance with Consolidation Ordinance No. 5 of September 28, 2017, which establishes 1.0 µg/mL as the maximum acceptable concentration of nitrite in drinking water. All lakes presented satisfactory results and, therefore, proved to be safe for the population to use. |
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