Parâmetros físico-químicos incomuns em água de abastecimento público de um município da região nordeste do Estado de São Paulo (Brasil)

Dovidauskas, Sérgio; Okada, Isaura Akemi; Iha, Maria Helena; Cavallini, Álvaro Gennari; Okada, Marina Miyuki; Briganti, Rita de CÃ¡ssia

doi:10.22239/2317-269x.00840

Cited by 9 publications

(11 citation statements)

References 11 publications

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“…Em trabalho anterior, foi demonstrado que a ACP da matriz de dados constituída de 88 amostras (municípios) x 12 variáveis (medianas das medidas de cada parâmetro físico-químico que apresentavam correlação significativa, obtidas no período de um ano) conduziu a um gráfico de escores exibindo a formação de 4 grupos distintos, em que Ibitinga constituía-se em um grupo de um único elemento (Figura 2A, variância explicada = 75%)devido a sua forte influência, esse município foi excluído do modelo e estudado separadamente (Dovidauskas et al, 2017a)…”

Section: Análise Multivariadaunclassified

Approach on Detection of Situation of Potential Risk to Health, Related to Water Quality: An Example

Dovidauskas¹,

Okada²,

Iha³

et al. 2018

PTQ

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This work describes the approach of a situation of potential risk to health due to nitrate contamination in water intended for human consumption, found in a study conducted in 88 municipalities in the Northeast region of the State of São Paulo (Brazil). 4,347 public water supply samples were analysed for 21 physico-chemical and 2 microbiological parameters. A municipality was distinguished from the others with regard to higher nitrate levels, while the principal components analysis showed that it belonged to a group of 14 municipalities (nitrate group). The Sanitary Surveillance Group was then contacted and, after confirmatory tests in new public water supply samples, analyses were performed on water samples from 16 wells in the county. The groundwater contamination was found, and technical meetings were held. One of the deliberations was the repetition of water analyses of the 16 wells. Consolidated results showed that the 5 wells had nitrate levels above the maximum value permitted by legislation. To mitigate nitrate groundwater contamination of that municipality actions are being taken as a result of 3 technical meetings already held. The other municipalities of the nitrate group are being monitored.

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Section: Análise Multivariadaunclassified

Approach on Detection of Situation of Potential Risk to Health, Related to Water Quality: An Example

Dovidauskas¹,

Okada²,

Iha³

et al. 2018

PTQ

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“…Natural water contains sodium in different proportions (it is a necessary element for living organisms). In surface waters the levels are usually below 50 ppm (Dovidauskas et al 2017). The results of this research show Na values between 12.08 and 20.29 ppm, which can be considered natural, eliminating the suspicion of anthropological contamination.…”

Section: Discussionmentioning

confidence: 52%

Determination of trace metals in water from Mangueira Lagoon – RS, Brazil

Santos

Rangel

Filho

2018

Water Practice and Technology

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Determination of trace metals was carried out in Mangueira Lagoon, in the southern zone of Rio Grande do Sul. Samples were collected at five points to evaluate the concentrations of the following trace metals: copper, zinc, lead, chromium, nickel and iron. Metals were determined by digestion with concentrated nitric acid and pre-concentrated in Chelex 100 resin analyzed by atomic absorption spectrophotometry. In parallel, the physical-chemical parameters pH, chlorides, alkalinity, hardness and organic matter in the water were determined. Potassium and sodium metals were analyzed by atomic emission spectrometry. The analyzes of pH and conductance were analyzed in the field while the others were done in the laboratory of the research group of environmental contaminants (GPCA). Through the results of physical-chemical parameters of the water, the Mangueira Lagoon exhibits a low degree of contamination, but in the future may compromise the biota of the lagoon. Regarding the focus of this work, of Cu, Cr, Fe, Ni, Pb, and Zn (heavy metals), only lead and iron obtained the values above that are established in CONAMA 357/2005.

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“…Apparent color was measured using a Digimed colorimeter, DM-COR model, and turbidity was determined using a Tecnopon turbidimeter, TB-1000 model. Concentrations of lithium, sodium, ammonium (as NH3), potassium, calcium, magnesium, fluoride, chlorite, bromate, chloride, nitrate (as N-NO3 -), AMPA, sulfate, phosphate (as P-PO4 3-) and glyphosate were determined by ion chromatography using validated methods previously described [25][26][27].…”

Section: Laboratory Analysismentioning

confidence: 99%

Analysis of Factors Involving Drinking Water Contamination by Glyphosate and/or Nitrate in Urban Areas

Dovidauskas

Okada

Santos

et al. 2022

Orbital: Electron. J. Chem.

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This study investigated factors that could be related to drinking water contamination in urban areas in order to obtain quality profiles that characterized presence of the glyphosate and nitrate contaminants. Thus, in a period of one year, 4,853 tap water samples from 89 cities in the northeastern region of the State of São Paulo, Brazil, were analyzed in 21 physicochemical and 2 microbiological parameters. Additionally, 4 demographic variables were also included in multivariate data analysis. Principal Component Analysis of physicochemical and microbiological data showed that glyphosate concentration is positively correlated with nitrate concentration, especially in cities that make exclusive use of groundwater, besides correlating with conductivity and with concentrations of calcium, magnesium, fluoride, chloride, phosphate and free residual chlorine. The inclusion of demographic variables in Principal Component Analysis did not significantly change waters physicochemical profiles, but in cities that exclusive use groundwater for public supply the number of hospitalizations for diarrhea correlated positively with glyphosate, nitrate and chloride concentrations, in addition to conductivity. Linear Discriminant Analysis models involving 5 variables (conductivity and concentrations of calcium, magnesium, chloride and nitrate) were able to predict the cities vulnerability to groundwater contamination by nitrate.

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Parâmetros físico-químicos incomuns em água de abastecimento público de um município da região nordeste do Estado de São Paulo (Brasil)

Cited by 9 publications

References 11 publications

Approach on Detection of Situation of Potential Risk to Health, Related to Water Quality: An Example

Approach on Detection of Situation of Potential Risk to Health, Related to Water Quality: An Example

Determination of trace metals in water from Mangueira Lagoon – RS, Brazil

Analysis of Factors Involving Drinking Water Contamination by Glyphosate and/or Nitrate in Urban Areas

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