Does cold water also leach nanoplastics from plastic containers?
Polypropylene food containers released measurable nanoplastics into room-temperature water in a 2025 study. Hot water released more, but cold storage was not zero.
Why temperature matters
Polypropylene is a common plastic used for food storage containers. Heat can increase plastic particle release, but room-temperature water can still pick up tiny particles from container walls.
What the research says
A 2025 study in Journal of Agricultural and Food Chemistry tested Australian polypropylene food containers under simulated use. Researchers chemically confirmed released polypropylene nanoplastics with multiple lab methods.
Total nanoplastic mass ranged from 0.01 to 3.7 micrograms per liter. Microplastic mass ranged from 0.4 to 10.8 micrograms per liter. Rinsing containers with 90 C water released more particles than room-temperature water, but room-temperature water still produced measurable release.
What to do at home
Use glass food storage for leftovers, sauces, and daily meal prep when you can. Avoid heating food in plastic. If you keep plastic containers, use them for cool, dry foods and replace scratched or cloudy containers.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Release of Nanoplastics from Polypropylene Food Containers into Hot and Cold Water. | J Agric Food Chem | 2025 |
What to use instead
Browse glass food storage for leftovers and meal prep. Glass will not remove every plastic exposure, but it cuts daily food contact with polypropylene containers.
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