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Distribution and potential sources of microplastics in sediments in remote lakes of Tibet, China
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Researchers assessed microplastic contamination in sediments from 12 remote lakes on the Tibetan Plateau in China, an area with minimal human activity. Despite the isolation, they found between 17 and 2,644 microplastic particles per kilogram of dried sediment, levels considered high compared to some other freshwater systems. The findings suggest that long-range atmospheric transport and limited local sources like tourism contribute to microplastic pollution even in some of Earth's most remote environments.
The prevalence of microplastics in water bodies such as oceans and rivers has received considerable attention in recent years. The present study contributes to this research effort by assessing microplastics in 12 remote lakes on the Tibetan Plateau, China. Despite the limited extent of human activities, at least 17 items and up to 2644 items of microplastics were found per kg of dried sediments collected from the lakes in Tibet. These values were considered high compared to the levels of microplastics reported in other lake areas worldwide. Our results showed that the most prevailing types of microplastics in the sediments were black or transparent fibers in the size range of 0.05-0.5 mm, which were mainly identified to be polyamide and polyethylene terephthalate using Fourier-transform infrared microspectroscopy. The number of microplastics found appeared to be higher in sediments with a higher silt and clay content. Atmospheric long-range transport, glacial meltwater and surface runoff represent potential pathways to carry microplastics from elsewhere to the remote lakes in Tibet. This study shall be of great significance in understanding the transport and distribution of microplastics in the environment at regional or global scale.
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Researchers collected water and sediment samples from rivers on the Tibet Plateau and found microplastic contamination even in this remote, sparsely populated region. The microplastics included fibers and fragments from synthetic textiles and packaging, likely transported by atmospheric deposition and human activity along river corridors. The study demonstrates that microplastic pollution has reached some of the most isolated freshwater systems on Earth.
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Researchers surveyed microplastic contamination across water bodies and sediments on the Tibetan Plateau, one of the most remote high-altitude regions on Earth, and found microplastics in every sample tested. Contamination levels were highest in turbid rivers and agricultural channels, and decreased at higher altitudes where there is less human activity. The study highlights that even remote, high-altitude areas are not free from microplastic pollution.
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