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Microplastic pollution in table salt and sugar: Occurrence, qualification and quantification and risk assessment
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Salt in foods: a definitive source of microplastics to humans
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Analysis of commercial crystal and iodized salts from India and Sri Lanka found 7.9–17.2 microplastic particles per kilogram, predominantly polypropylene and polyethylene fibers under 1 mm, with Indian salt classified at a higher chemical hazard level; daily consumption at WHO-recommended amounts would expose individuals to 14–31 microplastic particles per year. Salt represents a direct, daily dietary exposure route for microplastics, underscoring the need to protect salt production water sources and improve manufacturing processes.
Microplastic contamination in commercially available table salts of Pakistan
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Researchers tested table salt sold in Pakistan, from sea, rock, and lake sources, and found tiny plastic bits (microplastics) in all of them, averaging 30-35 pieces per kilogram, mostly black plastic fibers. The good news: because Pakistanis tend to eat less salt overall compared to countries like Bangladesh, their actual microplastic exposure from salt is lower, but the findings still confirm that plastic contamination has worked its way into a kitchen staple nearly everyone uses daily.
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Microplastics were tracked through every stage of Indonesian salt production — from seawater and estuarine canals to evaporation ponds, crystallization ponds, and finished salt — finding contamination at all stages with finished salt containing up to 37 items/kg. The results confirm that common dietary salt contains microplastics introduced during open-air solar production, representing a direct and globally widespread route for human ingestion of plastic particles.
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Using double-shot pyrolysis–GC/MS, researchers quantified six common microplastic polymers in bottled water, purified tap water, and table salt, detecting PET in one bottled water brand and PP in all purified tap water brands tested. The presence of microplastics in packaged drinking water and table salt—everyday dietary staples—confirms that humans ingest measurable quantities of plastic polymers through routine consumption, reinforcing the urgency of both source reduction and standardized food-safety monitoring.
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Researchers reviewed the sources, global distribution, and ecological impacts of microplastics, documenting their presence in drinking water, air, marine and freshwater environments, biota, and table salt, and assessing the associated risks to environmental and human health.
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