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A straightforward method for measuring the range of apparent density of microplastics
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Researchers developed a simple density gradient method using ethanol, ultrapure water, saturated NaI, and ZnCl2 solutions to measure the apparent density range of microplastics, covering densities from 0.8 to 1.8 g/cm3. NaI-based gradients proved more reliable than ZnCl2, which exhibited higher surface tension and measurement uncertainty.
Density of microplastics has been regarded as the primary property that affect the distribution and bioavailability of microplastics in the water column. For measuring the density of microplastis, we developed a simple and rapid method based on density gradient solutions. In this study, we tested four solvents to make the density gradient solutions, i.e., ethanol (0.8 g/cm), ultrapure water (1.0 g/cm), saturated NaI (1.8 g/cm) and ZnCl (1.8 g/cm). Density of microplastics was measured via observing the float or sink status in the density gradient solutions. We found that density gradient solutions made from ZnCl had a larger uncertainty in measuring density than that from NaI, most likely due to a higher surface tension of ZnCl solution. Solutions made from ethanol, ultrapure water, and NaI showed consistent density results with listed densities of commercial products, indicating that these density gradient solutions were suitable for measuring microplastics with a density range of 0.8-1.8 g/cm.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.