Microplastic pollution in Chinese Rivers: A detailed analysis of distribution, risk factors, and ecological impact

Microplastics (MPs) are developing pollutants of international significance owing to their durability and possible environmental hazards. This work aggregates a comprehensive dataset of 2474 microplastic samples from 165 publications inside Chinese watersheds to rectify deficiencies in existing risk estimates, which often exhibit data biases and insufficient consideration of microplastic properties. To give a more accurate assessment of ecological contamination and related dangers, we provide a comprehensive evaluation methodology that combines precise MP attributes, such as shapes, polymer kinds, colors, and sizes, with rescaled MP concentrations. Our research indicates that MP concentrations fluctuate by as much as seven orders of magnitude, with considerable regional fluctuation affected mainly by population density and precipitation patterns. These variables also influence the distribution of MP's physical and chemical characteristics throughout river basins. By integrating these characteristics into risk assessments, we determined that 50 % of the investigated places are classified as detrimental or very hazardous ecological categories. Moreover, 16.98 % of locations have MP concentrations beyond defined ecological danger limits, hence eliciting considerable environmental and toxicological apprehensions. This advanced evaluation framework gives an understanding of the geographical variability of microplastic contamination and its potential effects on Chinese freshwater ecosystems. "Enhanced monitoring and management techniques are necessary to address the growing complexity of microplastic contamination.".