Publications by authors named "Thais M Yamada"
Article Synopsis
- The Ibirité reservoir has faced ecological degradation largely due to raw urban sewage discharge, despite prior beliefs that oil refinery effluents were the main cause.
- Sediment analysis revealed lower concentrations of hydrocarbons and metals compared to other polluted sites, with most pollution sources being petrogenic, pyrogenic, or from industrial activities.
- Certain toxic metals in the sediment pose risks to aquatic life, indicating that the reservoir's degradation results from various pollution sources, particularly urban sewage, rather than hydrocarbons alone.
This work presents the validation procedures of an analytical method to determine the 16 PAHs from the US EPA's priority pollutants list in sediment samples using ultrasonic extraction coupled to gas chromatography-mass spectrometry. The extraction techniques are altered by the construction of an extraction flask adapted to the ultrasonic bath that greatly reduces losses and increases extraction efficiency of the volatile compounds, especially naphthalene. Cleanup procedures are also altered to change the polarity of the solvent mixture that contributes to reducing the elution of undesirable compounds.
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