Ecotoxicity of Natural Nanocolloids in Aquatic Environment

Abstract

Nanocolloids (Ncs) are highly dispersed mixtures of nanoscale (1–100 nm) heterogeneous systems, which are ubiquitous in aquatic environments. Ncs are considered a vital pollutant carrier due to their special surface properties and unique hydrodynamic characteristics. They play an essential role in the process of promoting pollutant migration and transformation. In recent years, with the increase in chemicals in the environment and the complexity of environmental pollution, the health threats of Ncs in ecological systems are arousing great concerning. Therefore, recent work to characterize the ecotoxicity of Ncs has focused on the potential environmental health implications, including exploration of toxicity to aquatic organisms from a wide range of the ecosystem food webs. Herein, we summarize the formation, distribution, and characterization of natural Ncs in the marine environments. Moreover, we highlight the adverse impacts of Ncs on representatives of various trophic levels aquatic organisms (e.g., algae, bacteria, invertebrates, and fish). The mechanisms of Ncs ecotoxicity at the cellular level are reviewed, and the remaining unclear points on toxic tools such as oxidative damage and metabolic disorder are presented. We also discuss the research challenges and future developments within the field of ecotoxicity. This study will bridge our knowledge gap on the ecotoxicity of Ncs.

Daphnia as a model organism to probe biological responses to nanomaterials—from individual to population effects via adverse outcome pathways

“…Current guidelines for NMs ecotoxicology tests do not prioritise the use environmentally transformed NMs in environmentally representative waters, for example, natural waters that are complex matrices containing natural organic matter and other biopolymers, the concentrations and compositions of which go through various environmental changes which can impact the physiochemical properties and toxicity of the NMs they interact with. Estimates for NM toxicity based on simplified salt only media thus under or over-estimate the impacts of NMs by not testing the appropriate NMs forms (Selck et al, 2016;Ouyang et al, 2022). To allow for comparisons between toxicity studies, the Organisation for Cooperation and Development (OECD) promotes the use of a fully defined testing medium for exposures in ecotoxicity testing.…”

Current Status of Omics in Biological Quality Elements for Freshwater Biomonitoring

“…During the last decade, unusual issues that affect aquatic ecosystems and others that are already well acknowledged have increased in acuteness and spatiotemporal enlargement in their ecological processes. For the first term, for instance, natural and artificial nanocolloids that a xenologist conducts in freshwater environments (toxic impact on endogenous molecular mechanisms), and with omics techniques, they can understand these aforementioned mechanisms more deeply [153]. Secondly, stressors such as drought can shift the dissolved organic carbon (DOC) and other dissolved compounds in water.…”

Configuration of Subsea Mooring System for Environmental Monitoring and Assessment

“…This will give an idea about the restoration of impact of disturbance. According to Ouyang et al (2022), the deep sea can be split into four zones: the epipelagic zone, the mesopelagic zone, the bathypelagic zone, and the abyssopelagic zone as depicted in Fig. 3.…”