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Microplastics as stratigraphic tracers of post-1950 deposition in a reworked tropical estuary, Brazil (Dataset)
Summary
Scientists studied layers of mud from a Brazilian river to show that tiny plastic bits (microplastics) started showing up right around 1950—matching the global explosion in plastic production—making them a reliable marker for dating sediment layers, much like scientists already use ash from burning fossil fuels. While this study is more about geology than direct health effects, it's a stark reminder of just how completely and permanently plastic pollution has embedded itself into our environment over the past 75 years, which matters since these same microplastics are increasingly found in our water, food, and even our bodies.
This dataset supports the article "Microplastics as stratigraphic tracers of post-1950 deposition in a reworked tropical estuary, Brazil." The data comprises the characterization of microplastics and fly ash particles sampled from a 240-cm sediment profile collected in the Cubatão River (Santos-Cubatão Estuarine System, SE Brazil). Methods: - Visual Identification: Particles were manually separated using a Zeiss stereomicroscope (Carl Zeiss GmbH) and an Axiocam 705 camera. Morphometric analysis (major and minor axes) was performed via Zeiss ZEN 3.11 software. - µ-FTIR Spectroscopy: Chemical identification was conducted using an Agilent Cary 630 spectrometer coupled to a Cary 610 FTIR microscope (ATR mode). Spectral range: 4000–550 cm-¹ at 4 cm-¹ resolution. - SEM-EDS Analysis: Surface morphology and elemental composition were analyzed using a Scanning Electron Microscope (SEM) coupled with Energy-Dispersive X-ray Spectroscopy (EDS) (JEOL JSM-IT500HR). - Data Processing: Raw transmittance spectra were converted to absorbance-like units (intensity) and normalized. A Savitzky-Golay filter was used for noise reduction, and linear interpolation was applied to remove atmospheric CO2 interference (2278–2389 cm-¹).