This data set is composed of two separate files: Chapter I – Silver Nanoparticles & Environmental Waters The first file contains raw data of the original intensity (counts per second) measured during the analysis of silver nanoparticles in environmental waters — optimization and application. These results correspond to those presented in the first chapter of the thesis. Chapter II – Polystyrene Nanoplastics, Silver Nanoparticles in Brazilian Soil The second file contains raw data of the original intensity (counts) measured during the analysis of silver nanoparticles and gold within nanoplastics in pore water and soil extracts — optimization and application. In addition, it includes elemental data obtained from soil acid digestions and total analysis of pore water. These results correspond to those presented in the second chapter of the thesis.