With approximately 450,000 active CPAs in the United States, the CPA certification is the most popular professional designation for accountants. Earning the CPA designation is no easy feat, as the CPA exam is known for its extreme difficulty.
Toxicokinetics (often abbreviated as 'TK') is the description of both what rate a chemical will enter the body and what occurs to excrete and metabolize the compound once it is in the body. It is an application of pharmacokinetics to determine the relationship between the systemic exposure of a compound in experimental animals and its toxicity.
One focus of the USGS Toxic Substances Hydrology (Toxics) Program is to investigate the occurrence and fate of agricultural chemicals in the environment from pesticides, fertilizers, veterinary medicines, and other sources. wide variety of Toxics Program investigations study the fate of agricultural chemicals either directly or indirectly. Toxics Program agricultural chemical investigations focus on: 1  Characterizing the processes that affect the dispersal of chemicals in the atmosphere, ground water, and surface water.