Congener

{
  "id": "MLC-T-ENV-006155",
  "term": "Congener",
  "field": "Environment",
  "definition": "1. A congener is one of the 209 different PCB compounds. A congener may have between 1 and 10 chlorine atoms, which may be located at various positions on the PCB molecule.\n\n2. Any one particular member of a class of chemical substances. A specific congener is denoted by unique chemical structure, for example 2,3,7,8-tetrachlorodibenzofuran.\n\n3. Any isomer of a homologous series. (Homologous refers to a series of compounds whose structures differ by some regular increment.)\n\n4. An individual compound with a common structure (dioxin, furan, or biphenyl), only differing by the number of chlorine or other substituent attached to the structure.",
  "subject": "Chemicals, toxics and pesticides",
  "references": [
    "Hudson River PCBs Glossary of Terms",
    "40 CFR 766.3 (CFR 2013)",
    "Basic Concepts in Environmental Sciences",
    "40 CFR 63.11426 (2023)"
  ],
  "url": "https://mlchart.com/terminology/environment/congener/"
}