## 1 Introduction  
The anthropogenic pollution of rivers and oceans causes contamination in hydrological reservoirs by dangerous elements present in sediments in the form of nanoparticles (NPs) and ultrafine particles that may contain harmful chemical elements, degrading the sustainability of the environment [1]. This contamination can compromise human health and sustainability of aquatic biodiversity globally [1; 2]. Therefore, the need for studies to identify the types of pollutants present in water resources is highlighted. This makes it possible to formulate policies to mitigate environmental pollution caused by dangerous chemical elements added to NPs [3; 4; 5]. It is important to remember that hazardous chemical elements are defined by their toxicity to human health and the environment, regardless of concentration levels [6; 7]. When considering toxic chemical elements in NPs and ultrafine particles, other studies [1; 2; 5; 8] demonstrate concerns regarding the high proportions of dangerous elements in aquatic environments. This contamination results from atmospheric pollution from leachate, industrial contamination, and a lack of adequate treatment of urban and rural waste released into water sources. [PERSON] et al. [1], when evaluating the dangerous elements aggregated in NPs resulting from anthropogenic impacts arising from coal mining activities in the southern region of Brazil, agricultural pesticides, swine farming, and the release of effluents into water resources, demonstrated through X-ray diffraction (XRD) elevated amounts of arsenic, lead, chromium, and mercury present in NPs in the beds of water bodies. [PERSON] et al. [2], when analyzing sedimentable atmospheric particulate matter (SeAPM) by XRD to identify chemical elements present in sediments, demonstrated a high potential for contamination in aquatic environments by arsenic, lanthanum, zirconium, and mercury when added to NPs. [PERSON] et al. [5], when studying the type of chemical contamination aggregated in NPs from steel industries, detected through XRD a high level of chromium, copper, and titanium capable of directly reaching water sources due to the lack of adequate treatment of leachate generated during the industrial process. [PERSON] et al. [8], when studying NPs containing dangerous chemical elements generated by industrial processes, the exploration for mineral coal and phosphogypsum, and the lack of adequate treatment of urban effluents, found a high presence of arsenic, lead, mercury, niobium, nickel, and vanadium in NPs analyzed with XRD. The European Space Agency (ESA) launched the Sentinel-3B OLCI (Ocean Land Color Instrument) into space on 16 February 2016, to contribute to terrestrial surveys capable of quantifying the levels of dangerous chemical elements present in NPs [9; 10; 11]. This makes it possible to understand the dynamics of chlorophyll-a displacement (CHL_NN), water turbidity (TSM_NN), and suspended pollution potential (ADG_443_NN) containing NPs and ultrafine particles responsible for the transport of dangerous elements across large regions [1; 9; 10; 11]. Consequently, chlorophyll-a levels, when detected in Sentinel-3B OLCI images, help us to understand the quantitative dynamics of pigments that represent plant tissues or the high proportion of algae and phytoplankton capable of obstructing the passage of sunlight in water and resulting in eutrophication. This problem is aggravated by the high accumulation potential of chemical elements in NPs in aquatic sediments [12; 13]. In this relationship, turbidity and the potential for suspended water pollution are associated with hydrological quality. Considering the comprehensive detection parameters via the Sentinel-3B OLCI satellite's optics, it is possible to understand the turbidity coefficients and absorption of total suspended matter in aquatic environments [14; 15]. According to [PERSON] et al. [1] and [PERSON] et al. [15], aquatic ecosystems contribute to the flow of sediments into rivers.