toxicity value

symbol: $T_{\rm{x}}$
https://doi.org/10.1351/goldbook.15106
Factor used to estimate risk. It may be a reference dose or it may be calculated from the following equation: \[T_{\rm{x}} = m\ C\] where \(m\) is the slope of a published dose-effect relationship and \(C\) is the toxicant concentration.
Source:
PAC, 2009, 81, 829. (Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)) on page 958 [Terms] [Paper]