2022-04-20 米国国立標準技術研究所(NIST)
・米国国立標準技術研究所(NIST)の研究者が、この微小なプラスチックについて理解を深めるために、広く使われている消費者向け製品をいくつか分析しました。その結果、プラスチック製品がお湯にさらされると、1リットルあたり何兆個ものナノ粒子が水中に放出されることがわかりました。
・NISTの研究者たちは、この研究成果を科学雑誌「Environmental Science and Technology」に発表しました。
<関連情報>
- https://www.nist.gov/news-events/news/2022/04/nist-study-shows-everyday-plastic-products-release-trillions-microscopic
- https://pubs.acs.org/doi/10.1021/acs.est.1c06768
一般的な使い捨てのプラスチック製品から、通常使用時に1リットルあたり数兆個の100 nm以下のナノ粒子が水中に放出される。 Common Single-Use Consumer Plastic Products Release Trillions of Sub-100 nm Nanoparticles per Liter into Water during Normal Use
Christopher D. Zangmeister, James G. Radney, Kurt D. Benkstein, and Berc Kalanyan
Environmental Science and Technology Published:April 20, 2022
DOI:https://doi.org/10.1021/acs.est.1c06768
Abstract
This study demonstrates that commonly used consumer products such as single-use food grade nylon bags and hot beverage cups lined with low-density polyethylene release nanometer-sized plastic particles at number densities >1012 L–1 when exposed to water. The number of particles released was a function of the initial water temperature (high temperature vs ambient) for each of the tested materials. Mean particle diameters were between 30 and 80 nm with few particles >200 nm. The number of particles released into hot water from food grade nylon was 7 times higher when compared to single-use beverage cups. On a particle number density basis, particles released into water from a single 300 mL hot beverage cup equate to one particle for every seven cells in the human body in a size range available for cellular uptake.