Toxic Substances Control Act Improvements Amendments of 1983

[AI summary unavailable — showing source text] Toxic Substances Control Act Improvements Amendments of 1983 - Amends the Toxic Substances Control Act (TSCA) to include under the definition of "chemical substance" any microorganism or other biological substance (thus providing for regulation under TSCA of "bioengineering" substances before they are genetically manufactured and sold). Provides for voluntary testing agreements under TSCA. Authorizes the Administrator of the Environmental Protection Agency (EPA) to negotiate agreements with chemical manufactures or processors to conduct testing. Requires: (1) publication of proposed agreements; (2) at least a 60-day public comment period; and (3) recordkeeping of all information and data regarding such agreements. Authorizes the Administrator to reopen such agreements if changed circumstances require modification of such agreements. Directs the Administrator to initiate appropriate action under specified TSCA provisions with respect to formaldehyde, not later than 180 days after enactment of this Act, taking into consideration both acute and chronic health effects associated with exposure to formaldehyde. Requires, within six months after enactment of this Act, that specified rules…