Interactions between micro(nano)plastics and natural organic matter: implications for toxicity mitigation in aquatic species.

Interaction of microplastics and nanoplastics with natural organic matter (NOM) and the impact of NOM on the sorption behavior of anthropogenic contaminants – A critical review

Exacerbated interfacial impacts of nanoplastics and 6:2 chlorinated polyfluorinated ether sulfonate by natural organic matter in adult zebrafish: Evidence through histopathology, gut microbiota, and transcriptomic analysis

The presence of natural organic matter (NOM) in drinking water can increase the levels of copper released from copper pipes to water and inhibit the formation of protective deposits such as malachite. Since adsorption of NOM on copper pipes surfaces is believed to be one of mechanisms that explains this phenomenom, the objective of this study was to determine kinetics and the adsorption equilibrium of main components of NOM, humic acid (HA) and fulvic acid (FA), onto copper surfaces. The kinetics and equilibrium adsorption of HA and FA on copper foils were examined using batch experiments at 22°C. HA and FA followed pseudo second-order kinetics adsorption. Rate constants measured were 2.59 × 10−1 (mgTOC cm−2 h−1) for HA and 3.13 × 10−1 (mgTOC cm−2 h−1) for FA. The adsorption behavior of HA and FA on the copper surface is in accordance with the Langmuir adsorption isotherm. Langmuir adsorption constants measured were 5.98 × 10−2 L mg−1 for HA and 4.78 × 10−2 L mg−1 for FA. The copper foils exposed during five months to FA formed malachite deposits, whereas those exposed to HA did not and just cuprite was found. The results of this study showed that both HA as well as FA adsorption on copper surfaces is favored and no significant differences were found in the adsorption parameters calculated for both compounds. However, the inhibition of the malachite precipitation could be attributed to the HA adsorption.

Understanding major NOM properties controlling its interactions with phosphorus and arsenic at goethite-water interface

Micro- and nanoplastics are plastic particles which are widely distributed in the environment. The pollution status and toxicity of micro- and nanoplastics in various environment matrices have attracted increcesing attention in recent years. In this review, we systematically assess the current literature on the sources and occurrences of micro- and nanoplastics in the environment and their potential impacts on marine organisms. We also discussed the potential human health effect of micro- and nanoplastics by uptake kinetics and toxicity assessment, and the toxic effects of the typical pollutants caused by micro- and nanoplastics. The results show that the sources of micro (nano) plastics in the terrestrial environment are mainly sewage sludge application, residues of plastic products used in agriculture, irrigation water contaminated by microplastics and/or aerial deposition. The micro (nano) plastics enter marine environment mainly by land input, seaside tourism, navigation shipping, marine farming and/or aerial deposition. In the marine environment, micro- and nanoplastics can be transported and accumulated through an aquatic food chain from lower trophic level to higher ones, and disturb the metabolism and propagation of the organisms. The toxicity of micro- and nanoplastics is dependent on the size and functional groups on the surface of plastic particles. In general, nanoplastics with smaller size might more easily penetrate and aggregate in cells and tissues and positively charged nanoplastics pose distinct effects on the physiological activity of the cells. Besides, the release of organic pollutants adsorbed on the plastic particles pose more serious toxic effects than the plastics themselves. We hope this review can provide effective support for systematic risk assessment and toxicology of micro- and nanoplastics in future research.

Humic acid enhances adsorption of antibiotic ciprofloxacin on polylactic acid microplastics, leading to reproductive and mitochondrial toxicity in Daphnia magna: Quantitative analysis.

Resolving natural organic matter and nanoplastics in binary or ternary systems via UV–Vis analysis

Partitioning of uranyl between ferrihydrite and humic substances at acidic and circum-neutral pH

Transport and deposition of microplastic particles in saturated porous media: Co-effects of clay particles and natural organic matter

This study investigates the contributions of natural organic matter (NOM) and bacteria to the aggregation and deposition of TiO(2) nanoparticles (TNPs) in aquatic environments. Transport experiments with TNPs were conducted in a microscopic parallel plate system and a macroscopic packed-bed column using fluorescently tagged E. coli as a model organism and Suwannee River Humic Acid as a representative NOM. Notably, TNPs were labeled with fluorescein isothiocyanate allowing particles and cells to be simultaneously visualized with a fluorescent microscope. Results from both experimental systems revealed that interactions among TNPs, NOM, and bacteria exhibited a significant dependence on solution chemistry (pH 5 and 7) and ion valence (K(+) and Ca(2+)), and that these interactions subsequently affect TNPs deposition. NOM and E. coli significantly reduced deposition of TNPs, with NOM having a greater stabilizing influence than bacteria. Ca(2+) ions played a significant role in these interactions, promoting formation of large clusters of TNPs, NOM, and bacteria. TNPs transport in the presence of both NOM and E. coli resulted in much less deposition than in the presence of NOM or E. coli alone, indicating a complex combination of interactions involved in stabilization. Generally, over the aquatic conditions considered, the extent of TNPs deposition follows: without NOM or bacteria > with bacteria only > with NOM only > combined bacteria and NOM. This trend should allow better prediction of the fate of TNPs in complex aquatic systems.

Stability studies for titanium dioxide nanoparticles upon adsorption of Suwannee River humic and fulvic acids and natural organic matter

Ferrate(VI) decomposition in water in the absence and presence of natural organic matter (NOM)

Overlooked risks of photoaging of nitrogenous microplastics with natural organic matter in water: Augmenting the formation of nitrogenous disinfection by-products.

Exposure to polyethylene terephthalate micro(nano)plastics exacerbates inflammation and fibrosis after myocardial infarction by reprogramming the gut and lung microbiota and metabolome.

Natural organic matter (NOM) can increase the uptake fluxes of three critical metals (Ga, La, Pt) in a unicellular green alga