It is known as Pyrolysis.

Word combinations follow a natural progression over time. Whether nouns, verbs, or modifiers, or any mix of these elements, the combination typically goes from two terms (bed bug) to a hyphenated term (bed-bug) to one term (bedbug) as it becomes embedded in our language.

The easiest way to decide if a compound term takes a hyphen is to look it up in the latest edition of a good dictionary. Stick with that dictionary because dictionary spellings vary, and you want to be consistent.

A term that appears in your dictionary as one word (i.e., written solid) or as hyphenated has become a permanent compound. Remember that the dictionary spelling also depends on the property of the term: noun (workout) or verb (work out), adjective (call-in) or verb (call in), etcetera.

In confirmatory tests, a procedure specific to the class or family of drug for which the sample screened positive is employed to "wash" or separate the drug itself from the matrix, i.e. blood or urine, in which it resides. The procedure of separating the drug from the sample is called an extraction. The Toxicology Section has different procedures for each class of drug. The general scheme of an extraction is to adjust the pH of the sample, expose the sample to an organic solvent to wash out the drug, collect and concentrate the organic solvent, and derivatize the drug in the sample. Some extractions have a but a few steps in the scheme, while others have many steps. The extraction process is one of the most time-consuming aspects of drug testing.