On September 28, 2023, the EPA finalized a rule that will provide the public with the largest-ever dataset of per- and polyfluoroalkyl substances (PFAS) manufactured in the United States through the ...

A chemical change is more than just a simple alteration; it's a profound transformation at the molecular level. When substances undergo a chemical change, they undergo a metamorphosis, fundamentally ...

It must take a really large umbrella to provide cover for 10,000 chemicals. At least that's what some in the rubber industry think the European Chemical Agency (ECHA) is trying to do with its proposed ...

Understanding the differences between physical and chemical changes is the basics in the study of chemistry. These two types of transformations describe how substances can change in terms of their ...

A harmonized global specification is possible providing that the procedures and acceptance criteria defined are acceptable to regulatory authorities in all regions. A substance is any matter that may ...

Agreeing on a precise definition of chemical biology has been a persistent challenge for the field. We asked a diverse group of scientists to “define chemical biology” and present a selection of ...

Carcinogens, reproductive toxins, and chemicals with high acute toxicity are high-risk materials and are classified by OSHA as “Particularly Hazardous Substances.” In addition to chemicals classified ...

Chemical purity is the most important quality characteristic of a pharmaceutical substance. This article describes the latest scientific and technological advances to meet recent pharmacopoeial and ...

Brønsted-Lowry Acid: A substance that donates a proton (H⁺). It is also known as a proton donor. Brønsted-Lowry Base: A ...

Dibutyl phthalate (DBP) (1,2-Benzenedicarboxylic acid, 1,2- dibutyl ester) EPA-HQ-OPPT-2018-0503 Butyl benzyl phthalate (BBP) (1,2-Benzenedicarboxylic acid, 1-butyl 2-(phenylmethyl) ester) EPA-HQ-OPPT ...

THIS is a book about which it is impossible to get up any feeling of enthusiasm; but one cannot resist a sense of wonder and admiration at the patient, plodding spirit in which the compiler must have ...