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Area of Science:

  • Environmental Science
  • Food Safety
  • Marine Biology

Background:

  • Microplastic contamination is a global environmental concern, with widespread presence reported in marine ecosystems.
  • Sea salt, derived directly from seawater, is a potential vector for microplastic ingestion into the human diet.

Purpose of the Study:

  • To investigate the presence and abundance of microplastics in various salt types sold in China.
  • To determine the characteristics and common types of microplastics found in sea salt.

Main Methods:

  • Collection of 15 brands of sea salts, lake salts, and rock/well salts from Chinese supermarkets.
  • Quantification and characterization of microplastics, including particle type, size, and polymer composition.

Main Results:

  • Sea salts exhibited significantly higher microplastic concentrations (550–681 particles/kg) compared to lake salts (43–364 particles/kg) and rock/well salts (7–204 particles/kg).
  • Fragments and fibers were the dominant microplastic types in sea salt, with particles <200 μm constituting 55%.
  • Polyethylene terephthalate, polyethylene, and cellophane were the most prevalent microplastics identified in sea salts.

Conclusions:

  • Sea salt is a significant source of microplastic contamination, indicating pollution in marine products.
  • This research provides the first report on microplastic pollution in abiotic sea products, highlighting a critical food safety issue.