Analytical Sciences

Interpretation of Seasonal Variation of Metals and Abiotic Properties in a Tropical Lake Using Multivariate Analysis and MINTEQA2 Program

Wagner J. BARRETO,*¹ Maira R. RIBEIRO,*¹ Maria C. SOLCI,*² Ieda S. SCARMINIO,*² Jorge NOZAKI,*³ Elisabeth de OLIVEIRA,*⁴ Sônia R. G. BARRETO*⁵

*1 Laboratory of Environmental Physical Chemistry, Department of Chemistry, Londrina State University, 86051-990, Londrina, Paraná, Brazil
*2 Department of Chemistry, Londrina State University, 86051-990, Londrina, Paraná, Brazil
*3 Department of Chemistry, Maringa State University, 87020-900, Maringa, Paraná, Brazil
*4 Institute of Chemistry, University of São Paulo, São Paulo, São Paulo, Brazil
*5 Graduate Program in Ecology of Aquatic and Continental Environments, Maringa State University, Av. Colombo, 5790, Maringa, PR, Brazil

The hydrological cycle of Lake Ipê and the principal parameters that could affect its abiotic parameters and its metal (Fe, Mn, and Cd) concentrations were investigated. A detailed study of seasonal variations using Principal Components Analysis (PCA) for the most relevant metals (Fe, Mn and Cd) was performed, assisted by the MINTEQA2 geochemical equilibrium program using 15 water abiotic parameters. The abiotic variables and metals in the lake were governed by the hydrological regimen of the Parana River and by the occurrence of occasional flood pulses and rainfall. The occurrence of cadmium is a concern; its presence could be due to industrial or agricultural activities or even to a natural geochemical process.

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