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Event-Based Variations in Microplastic Pollution in a Small Agricultural River During Rainfall
Summary
Scientists studied tiny plastic particles (microplastics) in a farming river and found that rainfall dramatically increases the amount of plastic pollution flowing downstream—up to 600 times more plastic particles during heavy rain compared to normal conditions. Most of these microplastics came from agricultural plastic films used by farmers, and over half of the pollution washed away in just the first part of each rainstorm. This matters because these contaminated rivers can carry microplastics into our drinking water sources and food chain, so reducing plastic use on farms could significantly cut this pollution.
Agricultural rivers are often silent receivers of microplastics (MPs) from diffuse, non-point sources; however, their pollution dynamics during rainfall events remain poorly understood. In this study, MP transport was investigated at three sampling points in an agricultural river catchment, where mulching films are used, and sewage sludge is not applied. Sampling was conducted in the Umeda River and its tributaries during six sampling events. MP flux exhibited a strong positive correlation with river discharge (L–Q relationship; n = 1.49–1.61, R2 = 0.67–0.87). The L–Q model indicates that a tenfold increase in discharge results in approximately a 600-fold increase in MP flux and a 1000-fold increase in total suspended solid flux. MP abundance during rainfall was up to four times higher than that during baseflow, ranging from 73 ± 64 to 200 ± 111 particles/m3, while peak flux reached 6736 particles/s, with an MP mass of 811 mg/s. Regarding particle characteristics, rainfall enhanced the heterogeneity of MPs, although fragments and polyethylene/polypropylene polymers remained consistently dominant across all hydrological stages. First-flush behavior was observed at HU, with more than half of the total MP mass exported within the initial 50% of the event flow volume. These findings help to inform mitigation strategies that should prioritize a reduction in upstream plastic inputs in order to effectively manage MP transport in agricultural rivers.