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Investigating microplastic release from plastic grinder heads during salt grinding.

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Plastic grinder heads are a significant source of microplastics in table salt during household use. This study found that common plastic grinders release thousands of microplastic particles, highlighting risks from food-contact materials.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Food Safety

Background:

  • Microplastic contamination in table salt is a known issue, but sources from food-contact materials during domestic use are understudied.
  • Previous research primarily focused on environmental origins of microplastics in salt.

Purpose of the Study:

  • To investigate microplastic release from plastic salt grinder heads during typical household use.
  • To quantify microplastic generation from different plastic grinder materials (PET, PC).

Main Methods:

  • Commercially available salt grinders with plastic heads were tested against a ceramic mortar control.
  • Optical photothermal infrared (O-PTIR) spectroscopy was used for microplastic identification and quantification.
  • Rigorous quality assurance, including procedural blanks and recovery rate calculations, was implemented.

Main Results:

  • Plastic grinder heads released significant quantities of microplastics (1,091–15,743 particles per 50g salt), far exceeding procedural blanks.
  • Microplastics identified were consistent with grinder head materials: polyethylene terephthalate (PET) and polycarbonate (PC).
  • Released microplastic particles had sizes in the tens of micrometres range.

Conclusions:

  • Everyday food-contact plastics, like salt grinder heads, can be a direct source of microplastics in consumer diets.
  • Mechanical stress during use, such as grinding, exacerbates microplastic release from these materials.
  • There is a need to evaluate the wear resistance of food-contact plastics and develop more durable alternatives to minimize consumer exposure.