Homolog

{
  "id": "MLC-T-ENV-013413",
  "term": "Homolog",
  "field": "Environment",
  "definition": "1. Group of isomers that have the same degree of halogenation. For example, the homologous class of tetrachlorodibenzo-p-dioxins consists of all dibenzo-p-dioxins containing four chlorine atoms. When the homologous classes discussed in this part are referred to, the following abbreviations for the prefix denoting the number of halogens are used:tetra-, T (4 atoms)penta-, Pe (5 atoms)hexa-, Hx (6 atoms)hepta-, Hp (7 atoms)HRGC means high resolution gas chromatography.\n\n2. Compound belonging to a series of compounds with the same general molecular formula, differing from each other by the number of repeating units of chlorine.",
  "subject": "Chemical substances",
  "references": [
    "40 CFR 766.3 (CFR 2013)",
    "40 CFR 63.11426 (2023)"
  ],
  "url": "https://mlchart.com/terminology/environment/homolog/"
}