Chemical analysis
The collection of sediments was performed using a Van Veen
grab, the samples were stored on sanitized flasks and a Styrofoam
cooler with ice to store and transport the samples. The samples
were sent to TASQA-Serviços Analíticos, Ltda. in Campinas, São
Paulo.
The sediment samples were opened using the EPA 3051 method
and the analysis was performed using inductively coupled plasmaoptical
emission spectrometry (ICP-OES).
After the removal of organic matter using H2O2, particle size
analysis of the sediments was conducted using the pipetting and
sieving method.