Preliminary results on microplastic pollution from agricultural soil in Vietnam: Distribution, characterization, and ecological risk assessment

Thi Oanh Doan; Thi Thuy Duong; Thi My Nguyen; Thi Quynh Hoang; Thanh Tam Luong; Phuong Thao Pham; Thi Thanh Nga Cao; Phuong Thu Le; Hieu Phung Hieu Phung; Thi Phuong Quynh Le; Thi Mai Anh Dang; Phuong Thuy Bui; Thanh Nghi Duong; Van Cuong Bui

doi:10.15625/2615-9783/18616

Author affiliations

Authors

Thi Oanh Doan Faculty of Environment, Hanoi University of Natural Resources and Environment, Hanoi, Vietnam
Thi Thuy Duong 1-Institute of Environmental Technology, VAST, Hanoi, Vietnam; 2-Graduate University of Science and Technology, VAST, Hanoi, Vietnam
Thi My Nguyen Institute of Environmental Technology, VAST, Hanoi, Vietnam
Thi Quynh Hoang Institute of Environmental Technology, VAST, Hanoi, Vietnam
Thanh Tam Luong Faculty of Environment, Hanoi University of Natural Resources and Environment, Hanoi, Vietnam
Phuong Thao Pham Institute of Environmental Technology, VAST, Hanoi, Vietnam
Thi Thanh Nga Cao 1-Graduate University of Science and Technology, VAST, Hanoi, Vietnam; 2-Institute of Human Geography, VAST, Hanoi, Vietnam
Phuong Thu Le University of Science and Technology of Hanoi, VAST, Hanoi, Vietnam
Duc Hieu Phung Institute of Chemistry, VAST, Hanoi, Vietnam
Thi Phuong Quynh Le Institute of Natural Product Chemistry, VAST, Hanoi, Vietnam
Thi Mai Anh Dang Institute of Environmental Technology, VAST, Hanoi, Vietnam
Phuong Thuy Bui Faculty of Environment, Hanoi University of Natural Resources and Environment, Hanoi, Vietnam
Thanh Nghi Duong Institute for Tropical Technology, VAST, Hanoi, Vietnam
Van Cuong Bui Institute for Tropical Technology, VAST, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/18616

Keywords:

Agricultural soil, ecological risk, farmland, microplastic, polymer

Abstract

Microplastics (MPs) have been extensively studied in aquatic systems; however, their presence in general agricultural systems and in particular, soil still needs comprehensive understanding. This study conducted a field survey at 25 sites to investigate the abundance of MPs in agricultural soil. The MPs in these soil samples were separated using sieves and filters by the density separation method with NaCl solution (d = 1.2 g/cm³). The density of MPs in agricultural soils ranged from 1,700 items/kg to 38,800 items/kg, with an average of 11,716 ±10,726 items/kg. The black-colored MPs were found to be dominant, followed by white, purple, red, and blue. The fibers represented most of the MPs' shapes observed in this research (77.9±17.4%). MPs in agricultural soil samples were tiny particles with sizes of <1,000 µm and 1,000-2,000 µm. A significant difference was observed in the concentration of MPs in locations near and far from residential areas and manufacturing facilities. The average concentration of MPs in the soils adjacent to the residential and manufacturing facilities and near the agricultural solid waste collection sites was 21,471±12,729 items/kg and 20,188±4,403 items/kg, much higher than in distant these locations at 4,418±1,573 items/kg. These results suggest that domestic, industrial, and agricultural activities could contribute to MP pollution in agricultural soil. The ecological dangers MPs pose in terrestrial and aquatic environments have drawn much attention from the scientific community. This work represented the first effort to comprehend the ecological risk of MPs on selected samples of Vietnamese agricultural soil. According to the Pollution Load Index (PLI) values, most agricultural soil samples in this study were contaminated with MPs at hazard level IV. The potential ecological risk index (PERI) values of agricultural soil samples from nearby residential, industrial, or agricultural solid waste areas indicated a higher ecological risk.

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