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It also maintains List I of chemicals and List II of chemicals, which contain chemicals that are used to manufacture the controlled substances/illicit drugs. The list is designated within the Controlled Substances Act [ 1 ] but can be modified by the U.S. Attorney General as illegal manufacturing practices change.
Threshold limit value − time-weighted average (TLV-TWA): The average exposure on the basis of a 8 hours per day, 40 hours per week work schedule. Threshold limit value − short-term exposure limit (TLV-STEL): A 15-minute TWA exposure that should not be exceeded at any time during a workday, even if the 8-hour TWA is within the TLV-TWA.
This is the list of Schedule I controlled substances in the United States as defined by the Controlled Substances Act. [1] The following findings are required for substances to be placed in this schedule: [2]
With a few exceptions, only annually produced quantities above 100 kg of List 2 substances from Part A or 1000 kg of a precursor from Part B must be reported to the OPCW by the Contracting States. A limit of 1 kg applies to the substance BZ in List 2. For substances in List 3, a threshold value of 30 tonnes applies. [3]
The Chemical Diversion and Trafficking Act of 1988 was an amendment to the Controlled Substances Act to regulate precursor chemicals, essential chemicals, tableting machines, and encapsulating machines by imposing record keeping and import/export reporting requirements on transactions involving these materials.
For chemicals, STEL assessments are usually done for 15 minutes and expressed in parts per million (ppm), or sometimes in milligrams per cubic meter (mg/m 3). [ 4 ] The American Conference of Governmental Industrial Hygienists publishes a more extensive list of STELs as threshold limit values (TLV-STEL).
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DEA List I chemical status [ edit ] Because hypophosphorous acid can reduce elemental iodine to form hydroiodic acid , which is a reagent effective for reducing ephedrine or pseudoephedrine to methamphetamine , [ 11 ] the United States Drug Enforcement Administration designated hypophosphorous acid (and its salts) as a List I precursor chemical ...