Total Petroleum Hydrocarbons (TPH)

Because there are many different chemicals in crude oil and other petroleum products, it is not practical to measure each one separately. Instead, the Total Petroleum Hydrocarbons (TPH) refers to any mixture of hydrocarbons found in crude oil. 

Chemicals that occur in TPH include: hexane, benzene, toluene, xylene, naphthalene, and fluorene.