Reference substance

Reference substance means any chemical substance or mixture, or analytical standard, or material other than a test substance, feed, or water, that is administered to or used in analyzing the test system in the course of a study for the purposes of establishing a basis for comparison with the test substance for known chemical or biological measurements.

Source

40 CFR § 160.3

---

Scoping language

As used in this part the following terms shall have the meanings specified:

---

Is this correct? or