Abstract
Distributions of trace metals in sediment cores from a hypertrophic reservoir in northeast Brazil
Highlights
Lakes are stationary bodies of water occupying hydrographic basins that have no connection to the ocean, and their contents of dissolved ions are low compared to those found in seawater
Principal component analysis (PCA) was applied to these data in order to identify trends in the vertical distributions of the different variables in the two sediment cores, as well as groupings between the variables and/or the sections
The measurements were the concentrations of the different parameters in each section of the two sediment cores (9 sections for each core), and the variables were the measured parameters (Cu, Cr, Co, Mn, Ni, Pb, Zn, Al, Fe and total organic carbon (Corg) content)
Summary
Lakes are stationary bodies of water occupying hydrographic basins that have no connection to the ocean, and their contents of dissolved ions are low compared to those found in seawater. Around 1 g of dry sediment was transferred to a PTFE reactor and treated with an acidic solution containing dilute HNO3 and HCl. The mixture was heated on the digester block for 30 min at 95o C, and the extract obtained was filtered prior to determination of the metal concentrations using FAAS.[9] The lake sediment SRM was analyzed together with the samples in order to ensure the quality of the partial metal extraction.
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