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Preliminary Detection of Suspected Microplastics in Soil at Varying Distances from a Dumpsite Using the Hot Needle Test
Summary
Researchers used a simple, low-cost test (touching a hot needle to particles to see if they melt like plastic) to check soil near a dumpsite for tiny plastic bits called microplastics. They found more suspected plastic particles close to the dump (within 3 meters) and none further away (10 meters), suggesting pollution is concentrated near waste sites rather than spreading far into surrounding soil. This matters because microplastics can enter the food chain through soil and crops, and this cheap testing method could help communities screen for contamination without expensive lab equipment.
Microplastic pollution has become an environmental concern because of its persistence and accumulation in ecosystems, including soil. This study assessed the presence of suspected microplastic particles in soil collected at different distances from a dumpsite in Barangay Makabaklay, Gapan City, Nueva Ecija, using low-cost screening methods such as sieving, density separation with sodium chloride (NaCl) solution, and the hot needle test. Soil samples were collected at distances of 0.5 m, 3 m, and 10 m from the dumpsite at a depth of 0.30 m, with two replicates per location. Samples were air-dried, sieved using a 60-mesh (0.3 mm) sieve, and subjected to density separation to isolate lighter particles. Suspected particles were analyzed using the hot needle test, where melting or deformation indicated possible plastic composition. Results showed positive responses in samples from 0.5 m and 3 m, while no positive response was observed at 10 m. Findings suggest that suspected microplastic occurrence decreases as distance from the dumpsite increases. The study concludes that the hot needle test is a practical and cost-effective preliminary screening method for suspected microplastics in soil.