Final chronic value

{
  "id": "MLC-T-CHM-004428",
  "term": "Final chronic value",
  "field": "Chemistry",
  "definition": "An estimate of the concentration of a substance that falls at the 5th percentile of the chronic toxicity values for the aquatic genera tested, used as the long-term component of water quality criteria. When too few chronic tests exist, it is obtained instead by dividing the final acute value by a final acute-chronic ratio. In US water quality criteria it is the basis of the criterion continuous concentration, whereas half the final acute value gives the criterion maximum concentration.",
  "subject": "Chemistry and Human Health",
  "see_also": [
    "acute-to-chronic toxicity ratio",
    "final acute value"
  ],
  "references": [
    "PAC, 2009, 81, 829. 'Glossary of terms used in ecotoxicology (IUPAC Recommendations 2009)' on page 886 (https://doi.org/10.1351/PAC-REC-08-07-09)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/final-chronic-value/"
}