Contrast with non-point source . Polar substances like benzene tend to dissolve in water, while non-polar substances such as pesticides tend to adsorb to soil particles. The state of being either positively or negatively charged. A class of chemical compounds containing benzine and chlorine atoms. The toxicity of PCBs varies based on the degree of chlorination and the position of chlorine atoms in the overall structure.
Examples are pesticides and fire-resistant coatings.
A group of aromatic hydrocarbons having three or more aromatic nuclei in their structures. A natural or synthetic macromolecule made up of combinations of repeating chemical units. Examples include cellulose and plastics. In geology, a minute space between particles of a solid, such as soil or sediment, which permits the passage of liquids or gases. PPB Parts per billion.