Drugs, which can include both prescription and nonprescription pharmaceuticals are substances that can alter the way the body works or treat or prevent disease.

Acids (organic acids) are organic compounds containing the carboxylic, hydroxyl or phenol group.

Amino acids are nitrogen containing compounds with both amino and carboxylic acid groups and are the basic building blocks of proteins and peptides.

Enantiomers are optically active stereoisomers of molecules that are nonsuperimposable mirror images of one another differing only in the configuration about the chiral (center) atoms.

Carbohydrates are sugar containing molecules that act as the primary biological means of storing or consuming energy for animals and plants. They are mainly found in cereal foods, fruits and vegetables.

Fatty acids are carboxylic acids with a saturated or unsaturated aliphatic tail that are the basic unit of lipids. Esters are organic compounds formed when an acid and alcohol react and contribute to flavors and aromas.

Catecholamines are neurotransmitters and hormones primarily secreted by the adrenal glands that have an effect on the nervous system, cardiovascular system, metabolic rate, smooth muscle, and temperature.

PAHs also known as polycyclic or polynuclear aromatic hydrocarbons are organic compounds containing only carbon and hydrogen in the arrangement of a fused ring structure containing at least two benzene rings.

Pesticides are chemicals or biological agents used to control, repel, attract or kill pests. Pests are organisms that include insects and weeds that compete with humans for food, destroy property, spread disease or are considered a nuisance.

Steroids are a class of lipids that serve as precursors for vitamins and function as hormones.

Surfactants are wetting agents that lower the surface tension of liquids allowing easier spreading, dispersion of solids, inhibition of foam and emulsification of mixtures.

Polymers are large high molecular weight natural or synthetic organic molecules formed by the linkage of many smaller molecules known as monomers.

Vitamins are a class of unrelated organic compounds required in trace quantities by a living organism for the proper regulation of reproduction, growth, health and metabolism.

Natural Products

Herbal medicines are individual herbs or mixtures of herbs that are used for therapeutic value. They are derived from plants and plant materials.

Fuels

Phenols are weakly acidic water-soluble organic compounds consisting of one or more hydroxyl groups attached to an aromatic hydrocarbon group.

Organic solvents, solvents other than water, are organic compounds that are liquids under standard conditions.

Drugs, Herbal Medicines, Natural Products

EPA Methods, Halocarbons, Hydrocarbons, Solvents

EPA Methods, Acids