Microplastic contamination in freshwater: first observation in Lake Ulansuhai, Yellow River Basin, China
Microplastic pollution has been widely studied in the marine environment, but is much less explored in terrestrial waters, notably in China. Therefore, we studied the degree of microplastic pollution in surface waters of Lake Ulansuhai, a major freshwater lake in the Yellow River basin of northern China. Results show microplastic concentrations ranging from 1760 ± 710 to 10,120 ± 4090 n/m3. The microplastic spatial distribution is heterogeneous, with higher levels near the drainage canal entrance of Lake Ulansuhai, and a downward trend from north to south in the lake. The main type of microplastics is colored particles, including fibers as the most abundant. More than 80% of microplastics were smaller than 2 mm. FTIR analysis results show that the main plastics were polyethylene, polystyrene and polybutylene terephthalate. There were also some metallic elements adsorbed on the surface of microplastics, such as Fe, Ca and Zn, detected by energy-dispersive spectrometry. The presence of metallic elements may worsen water pollution.
KeywordsMicroplastic Contamination Freshwater Yellow River Hetao Irrigation District Lake Ulansuhai
We thank editors and reviewers for their helpful suggestions on the paper. This project was supported in part by the National Natural Science Fund (41263010), Inner Mongolia Science and Technology Innovation Guidance Project (KCBJ2018033), Scientific Research Projects of University in Inner Mongolia (NJZY19132).
- Kobbing F, Niels T et al (2016) Cutting of Phragmites australis as a lake restoration technique: productivity calculation and nutrient removal in Wuliangsuhai Lake, northern China. 2016(5):400–410. https://doi.org/10.3724/sp.j.1226.2016.00400
- Rochman CM, Kurobe T, Flores I et al (2014) Early warning signs of endocrine disruption in adult fish from the ingestion of polyethylene with and without sorbed chemical pollutants from the marine environment. Sci Total Environ 493(1):656–661. https://doi.org/10.1016/j.scitotenv.2014.06.051 CrossRefGoogle Scholar
- Shengnan Z, Xiaohong S, Hanmeng Z et al (2018) Simulation on the species of heavy metals in Wuliangsuhai Lake water. Ecol Environ Sci. https://doi.org/10.16258/j.cnki.1674-5906.2018.02.019 CrossRefGoogle Scholar
- Wang Z, Li X, Shi H et al (2017a) Effects of mulching years and irrigation methods on residual plastic film in Hetao Irrigation District. Trans Chin Soc Agric Eng 33(14):159–165. https://doi.org/10.11975/j.issn.1002-6819.2017.14.022 CrossRefGoogle Scholar
- Wang Z, Xianyue LI, Shi H et al (2017b) Effects of residual plastic film on infiltration and evaporation for sandy loam and sandy soil. Trans Chin Soc Agric Mach 48(1):198–205. https://doi.org/10.6041/j.issn.1000-1298.2017.01.026 CrossRefGoogle Scholar