## 1 Introduction
This process, aggravated by the irrigation process and industries, has the potential to release high levels of dangerous chemical elements coupled with NPs into aquatic environments. This negatively affects the hydrological quality of these water bodies by increasing turbidity levels and the potential for suspended pollution, which can be seen by remote sensing via the Sentinel-3B OLCI satellite. This makes it possible to collect geospatial data associated with the quality of a water resource. It is important to highlight that data collection through images from the Sentinel-3B OLCI satellite is configured as an advanced and robust tool for the geospatial assessment of environmental impacts on chlorophyll-a (CHL_NN), water turbidity (TSM_NN), and the potential of suspended pollution (ADG_443_NN) in surface water bodies, such as rivers, lakes, bays, and oceans in large regions [16]. This enables a greater understanding of the dispersion dynamics of NPs and ultrafine particles in sediments, which may contain dangerous chemical elements when detected via XRD. These can move through aquatic environments influenced by the speed of water flow or the intensity of marine currents. These elements can increase water toxicity in large regions [16; 17; 18]. Contamination in hydrological environments by dangerous chemical elements compromises the survival of several species of aquatic fauna and flora and directly affects local sustainability, as there are local fishermen who depend on fishing as a means of family subsistence [8; 19]. When these types of chemical contaminants are identified in sediments through analysis via XRD and in their range of large-scale displacement through images from the Sentinel-3B OLCI satellite, it becomes possible to create public policies capable of mitigating environmental pollution and raise sustainability levels on macroscales [8; 20; 21]. This study is justified by the need to quantitatively detect the type of dangerous elements attached to sediments in Cartagena Bay, located in the city of Cartagena, Colombia. This is due to its economic importance for the Colombian population. Solid wastes and effluents are released into the bay via numerous industries, areas of agricultural and livestock use, and the increase in the number of tourists who visit the Mar do Sul daily, increasing the degree of environmental pollution in the waters of Cartagena Bay [22; 23]. As having occurred throughout most of the world, the operations of the city of Cartagena were interrupted during 2020 due to restrictions imposed by the COVID-19 pandemic, only resuming in 2021 [24]. [PERSON] et al. [25] and [PERSON] [26] suggest that studies involving satellites coupled with terrestrial sampling from the perspective of environmental geochemistry address data detection on a global scale. We must recognize the period of restrictions on the functioning of cities between 2020 and 2021 due to the COVID-19 pandemic, as well as the post-opening period of cities, with the easing of these restrictions aimed at controlling travel, industrial activities, non-emergency services, and tourism. This temporal variation (from 2020 to 2021), suggested for satellite studies and terrestrial applications from the perspective of geochemistry [25; 26], makes it possible to observe water pollution by dangerous chemical elements, highlighting the emerging importance of studies capable of supporting the creation of sustainable public mitigation policies by bodies responsible for maintaining the quality of aquatic environments at a global level [1; 27; 28; 29].