Pre-analysis Standard

{
  "id": "MLC-T-ENV-021849",
  "term": "Pre-analysis Standard",
  "field": "Environment",
  "definition": "A group of isotopically labeled compounds added at a known amount immediately prior to analysis and used to monitor instrument response, injection errors, instrument drift and to determine the recovery of the pre-extraction standard compounds. Add pre-analysis standard to every sample (including blank, QC samples, and calibration solutions) at a known amount.",
  "references": [
    "40 CFR 63.11426 (2023)"
  ],
  "url": "https://mlchart.com/terminology/environment/pre-analysis-standard/"
}