Sea salt sold in markets across Lombok Island, Indonesia, is contaminated with microplastics, according to a recent study. Microplastics are small plastic particles less than 5 millimeters in length that form when larger plastic waste breaks down. Microplastics have been found everywhere scientists have looked for them, including seafood and table salt, raising concerns for public health.  Much of the plastic waste generated on land ends up in the ocean where it can break down into microplastics. Because sea salt is created by evaporating salt water, it is particularly vulnerable to microplastic contamination when the source water contains suspended microplastics. Scientists estimate that there are millions of tons of plastic pollution in the ocean, by far the largest form of marine pollution.  The research team lead by Anna Ida Sunaryo Purwiyanto collected 20 salt samples from vendors at 10 markets across Lombok Island. They extracted potential microplastic particles from the samples and identified the particles using a stereo microscope. Every salt sample contained microplastics, “indicating widespread contamination across the surveyed markets,” the study notes. The researchers found some variation in microplastic contamination levels in different markets and in crystal versus fine sea salt. However, the results consistently showed that the source material for the salt, the ocean surrounding Lombok Island, is contaminated with microplastics. The researchers note that crystal sea salt had higher levels of microplastics than fine salt, likely because fine salt is washed and filtered, which removes some microplastic particles. They conclude that additional washing and filtering of salt…This article was originally published on Mongabay

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