Relative isotope-ratio difference

{
  "id": "MLC-T-CHM-010146",
  "term": "Relative isotope-ratio difference",
  "field": "Chemistry",
  "definition": "A measure of the difference in the isotopic composition of a sample compared to a reference material, expressed as a fractional or percentage deviation. It quantifies the enrichment or depletion of a specific isotope relative to another in a given element. This value is typically reported in per mil (‰) units.",
  "synonyms": [
    "delta notation",
    "isotope delta",
    "relative difference of isotope ratios"
  ],
  "subject": "Analytical Chemistry",
  "see_also": [
    "isotope ratio",
    "isotopolog ions",
    "isotopomeric ion"
  ],
  "references": [
    "PAC, 2013, 85, 1515. 'Definitions of terms relating to mass spectrometry (IUPAC Recommendations 2013)' on page 1584 (https://doi.org/10.1351/PAC-REC-06-04-06)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/relative-isotope-ratio-difference/"
}