Common use of Test substance Clause in Contracts

Test substance. The use of a radioactive test substance is required for all stud- ies. Ideally, the purity, radioactive and nonradioactive, is greater than 99 per- cent. The radioactive and nonradio- active test substances shall be chromatographed separately and to- gether to establish purity and identity. If the purity is less than 99 percent or if the chromatograms differ signifi- cantly, EPA should be consulted.