We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Disturbances of MPs on nitrogen in surface water: A case study of Chinese water bodies in the past three years
Summary
This study investigated whether the presence of microplastics in Chinese rivers and lakes correlates with nitrogen pollution — specifically ammonia nitrogen and total nitrogen levels. Analyzing water quality data collected over three years, the researchers found statistical associations suggesting that microplastics disturb nitrogen cycling in surface waters, potentially by affecting the microbial communities that process nitrogen compounds. Understanding this interaction matters because both microplastics and excess nitrogen are major threats to freshwater ecosystem health.
Microplastics (MPs) are ubiquitous in surface waters, yet their impact on nitrogen concentrations remains underexplored. This study investigates the relationship between MPs and both ammonia nitrogen (NH₃-N) and total nitrogen (TN) through statistical analysis. Over the past three years, NH₃-N concentrations in Chinese rivers have ranged from 0.02 to 3.18 mg/L, while TN concentrations have varied between 0.741 and 10.18 mg/L. The abundance of MPs in these waters ranges from 1.75 to 1450.011 items/L. Research indicates that MPs can promote ammonification, leading to an increase in NH₃-N accumulation by inhibiting nitrification and nitrogen assimilation processes. Conversely, MPs accelerate the removal of TN by enhancing denitrification activity. The results reveal that electrical conductivity (EC) is a key mediating factor in the impact of MPs on nitrogen in water bodies (standardized path coefficient: 0.521). For the first time, this study identifies a threshold effect for MPs in surface waters: a threshold of 3.854 items/L (P < 0.001) was determined, above which the efficiency of total nitrogen removal decreases. This research provides a theoretical foundation for understanding the impact of MPs on the nitrogen cycle in surface waters.