2007
DOI: 10.1590/s0103-84782007000600045
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Fatores determinantes da qualidade das águas superficiais na bacia do Alto Acaraú, Ceará, Brasil

Abstract: Fatores determinantes da qualidade das águas superficiais na bacia do Alto Acaraú, Ceará, Brasil.Ciência Rural, v.37, n.6, nov-dez, 2007. Ciência Rural, Santa Maria, v.37, n.6, p.1791-1797, nov-dez, 2007 ISSN 0103-8478 pH, temperatura, cor, turbidez, nitrato, amônia total, amônia livre, amônia ionizada, sódio, cloretos, potássio, sulfato, dureza, cálcio, magnésio, alcalinidade total, alcalinidade RESUMO

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Cited by 27 publications
(31 citation statements)
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“…Although the factor matrix changes, the communalities and the percentage of total variance explained, does not change. Previous studies (ANDRADE et al, 2007;ANDRADE et al, 2008;PALÁCIO et al, 2008 and SILVA;SACOMANI, 2001) have applied the varimax rotation to get a better and more explicit assignment of water quality variables to PCs. Table 1 presents the loadings of the variables after applying the varimax rotation at both areas A1 and A2.…”
Section: Principal Component Analysismentioning
confidence: 99%
See 1 more Smart Citation
“…Although the factor matrix changes, the communalities and the percentage of total variance explained, does not change. Previous studies (ANDRADE et al, 2007;ANDRADE et al, 2008;PALÁCIO et al, 2008 and SILVA;SACOMANI, 2001) have applied the varimax rotation to get a better and more explicit assignment of water quality variables to PCs. Table 1 presents the loadings of the variables after applying the varimax rotation at both areas A1 and A2.…”
Section: Principal Component Analysismentioning
confidence: 99%
“…Human occupation and land use change the biological, physical and chemical processes of the surrounding ecosystem (ANDRADE et al, 2007); these alterations can be evaluated by monitoring the water quality (MONTEIRO; PINHEIRO, 2004) of the ecosystem. To examine deeper the influence of anthropogenic activities on water quality, scientists have focused on studying irrigated agriculture, the main consumer and one of the main polluters of water bodies, both surface and groundwater (DOWD et al, 2008;MULLER et al, 2007;FENG et al, 2005).…”
Section: Introductionmentioning
confidence: 99%
“…Samples P1-05/2007 and P3-08/2007 are included in this group because they have elevated chlorophyll 'a' concentrations, probably due to an algae flourishing phenomenon at this time. In the study about the superficial water quality in the Acaraú watershed, Andrade et al (2007) it was concluded that the nutrients and sediment transport (anthropic action), along with the salts, are indicators of more weight in the definition of water quality in the region.…”
Section: Cluster Analysismentioning
confidence: 99%
“…However, in general, these variables are correlated which makes it difficult to have a clear understanding of how they are inter-related and make a decision of the measures to be implemented (ANDRADE et al, 2007;BRITO et al, 2006). Using multivariate statistics techniques, it is possible to define the relationships among the variables.…”
Section: Introductionmentioning
confidence: 99%
“…Resultados semelhantes foram encontrados em outros estudos, onde a maioria das amostras analisadas apresentaram valores de oxigênio dissolvido dentro do permitido pela legislação (Buzelli e Cunha-Santino, 2013;Andrade et al, 2007). Como o oxigênio dissolvido é fundamental para organismos aeróbicos, elevados valores de matéria orgânica na água diminuem sua concentração por ser utilizado pelas bactérias na decomposição, prejudicando a vida aquática e indicando poluição (Von, 2005).…”
Section: Resultsunclassified