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1.
ACS Omega ; 5(51): 32899-32906, 2020 Dec 29.
Article in English | MEDLINE | ID: mdl-33403251

ABSTRACT

The objective of this work was to develop a method to calculate the water quality index (WQI) using chemometric methods. The study was carried out at the Curuá-Una hydroelectric power plant in the state of Pará in the Brazilian Amazon. Eight collection stations in four periods (winter, intermediate I, summer, and intermediate II) and 29 parameters were selected. Multivariate analysis was applied to the results to verify the quality of the data and to select the most sensitive variables to be used as indicators for the WQI calculation. The 10 parameters selected were E h, dissolved oxygen, total dissolved solids, chlorophyll a, phosphate, Ba, Ca, Fe, Na, and Sn. The WQI proposed herein was effective in the classification of water quality for the periods analyzed.

2.
Bull Environ Contam Toxicol ; 84(4): 368-72, 2010 Apr.
Article in English | MEDLINE | ID: mdl-20352183

ABSTRACT

The concentration of arsenic in the hair of the individuals living in Santana city was measured. 121 donors in urban and the periphery area were studied. The periphery of the city shows the highest levels of arsenic (5.94 +/- 6.54 mg kg(-1) - mean; 0.27-23.85 mg kg(-1)). 47.83% in the urban area showed arsenic concentrations of less than 1.00 mg kg(-1), while in the periphery only 11.22% had results below this value. The results showing the influence of residence location. The Principal Component Analysis showed that the variable residence location were responsible for the correct formation of the periphery group.


Subject(s)
Arsenic/analysis , Environmental Pollutants/analysis , Hair/chemistry , Adolescent , Adult , Aged , Brazil , Child , Female , Humans , Male , Middle Aged
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