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

Autor(es)

Dovidauskas, Sergio ; Okada, Isaura Akemi ; dos Santos, Felipe Rodrigues ; Okada, Marina Miyuki ; Briganti, Rita de Cassia ; Moreira Souto, Marco Antonio

• Tipo de documento: Artigo Científico
• Fonte: ORBITAL-THE ELECTRONIC JOURNAL OF CHEMISTRY; v. 14, n. 3, p. 14-pg., 2022-07-01.

Resumo

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 Sao 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. [GRAPHICS] . (AU)

• Processo FAPESP: 18/20342-7 - Treinamento e aperfeiçoamento em análise físico-química de águas destinadas ao consumo humano
• Beneficiário: Felipe Rodrigues dos Santos
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 17/24883-0 - Pesquisa de substâncias de interesse para a saúde pública em águas de abastecimento do nordeste do estado de são paulo
• Beneficiário: Sergio Dovidauskas
• Modalidade de apoio: Auxílio à Pesquisa - Regular