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Microplastics in solar salt: baseline contamination assessment from Goa, India
Summary
Scientists analyzed solar salt samples harvested from salt pans in Goa, India, and found microplastics in every sample, averaging about 84 particles per 100 grams. The most common types were polyethylene, polyester, and polypropylene fibers, and the pollution risk index indicated a high ecological hazard. Based on typical salt consumption, the researchers estimated that a person could ingest roughly 2,458 microplastic particles per year from salt alone.
Microplastics (MPs) in food pose potential health risks, yet their occurrence in solar salt remains underexplored. However, limited research exists on MP contamination in natural solar salt, particularly in estuarine environments. This study addresses this gap by assessing MP contamination in salt harvested from solar salt pans downstream of the Mandovi estuary, Goa, India. Eight salt samples were collected from the saltpan and analysed using density separation, filtration, and FTIR spectroscopy. MPs were detected in all samples, with concentrations ranging from 64.00 ± 1.89 to 106.67 ± 10.37 particles/100 g (mean: 84.17 ± 14.47 particles/100 g). The majority of MPs were within the 0.1-0.3 mm size range (49.21%), predominantly fibres (90.40%), and colourless (64.30%). Polyethylene (29.2%), polyester (20.8%), and polypropylene (16.7%) were the dominant polymer types. The pollution load index (1.16) and polymer risk index (PRI > 1000) indicated a high ecological hazard (Level V). Estimated annual MP intake from salt consumption was 2,457.8 particles per person. These findings provide critical evidence of MP contamination in natural solar salt and underscore the need for targeted mitigation strategies to minimize human exposure.
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