Monitorização de íons nitrito na água de lagoas localizadas na região metropolitana norte de Natal-RN, entre os anos de 2020 e 2022
Nitrite and nitrate ions are found freely in the environment, by natural sources through nitrogen biogeochemical cycle, and by anthropogenic sources as employment of excessive nitrogenic fertilizers, domestic and industrial effluents launched inappropriately. With the increasement of urban, agric...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/49948 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | Nitrite and nitrate ions are found freely in the environment, by natural sources
through nitrogen biogeochemical cycle, and by anthropogenic sources as
employment of excessive nitrogenic fertilizers, domestic and industrial effluents
launched inappropriately. With the increasement of urban, agricultural and industrial
activities, the superficial waters have been gradually contaminated with nitrate and
nitrite ions. The monitorization of nitrite ion, as a toxic chemical agent, is important for
both environmental and human health. Frequent ingestion of water contaminated
with nitrite is associated with a higher risk of cancer development, beside its known
methemoglobin activity, affecting mainly babies and leading them to cyanosis,
popularly known as blue baby syndrome. The metropolitan region of Natal/RN
contain a large number of lagoons, many of them used to serve water to population,
either through water collect systems or by direct use of people living nearby, using
them in their plantations, daily needs, for ingestion by animals or for their own
consumption. The monitorization of nitrite ion, as a toxic chemical agent, is important
for both environmental and human health. Considering the risk to human health, the
aim of this study was to monitor nitrite ion concentration in water samples of the
lagoons Cachoeirinha, Extremoz, Jacumã, Muriú and Pitangui, localized at north
metropolitan region of Natal/RN, through 2020 and 2022. The water analysis was
performed using a UV/VIS molecular absorption spectrophotometer. At 2020, the
methodology didn’t detect nitrite levels in the samples collected from Cachoeirinha,
Jacumã and Muriú lagoons. The samples from Extremoz and Pitangui lagoons
revealed 0,01 µg/mL and 0,02 µg/mL, respectively. At 2021, the methodology
revealed nitrite concentrations between 0,02 µg/mL and 0,04 µg/mL in the samples
analyzed. At 2022, the collect of samples occurred in two moments: March and
September. The samples collected in March revealed nitrite concentrations between
0,01 µg/mL and 0,02 µg/mL and those collected in September revealed
concentrations between 0,01 µg/mL and 0,02 µg/mL. Light nitrite level variations
were observed through the three years of monitorization. These variations can be
correlated to the period of samples collection. All samples presented values above 1
mg/L, the maximum value allowed (MVA) of nitrite ion in water for human
consumption, according to GM/MS n° 888 (from May 4
th, 2021). The study concluded that in relation to nitrite ion, the water samples were adequate for human use. |
|---|