Sentences with phrase «unusual types of chemical»
Not exact matches
In an unusual exercise of its authority under the Toxic Substances Control Act (TSCA), the U.S. Environmental Protection Agency announced on December 30 the establishment of a «chemicals of concern» list and action plans that could prompt restrictions on four types of synthetic chemicals used widely in manufacturing and consumer products, including phthalates used to make flexible plastics, often for toys, household products and medical equipment.
https://www.scientificamerican.com/
Last April astronomical detectives announced a break: An orbiting X-ray observatory picked up the chemical fingerprints of several elements in a burst's afterglow, identifying the object as an unusual type of supernova — the detonation of a massive, dying star.