Corrected Concentration

{
  "id": "MLC-T-ENV-006727",
  "term": "Corrected Concentration",
  "field": "Environment",
  "definition": "Result of an accuracy or precision assessment test of an open path analyzer in which a high-concentration test or audit standard gas contained in a short test cell is inserted into the optical measurement beam of the instrument. When the pollutant concentration measured by the analyzer in such a test includes both the pollutant concentration in the test cell and the concentration in the atmosphere, the atmospheric pollutant concentration must be subtracted from the test measurement to obtain the corrected concentration test result. The corrected concentration is equal to the measured concentration minus the average of the atmospheric pollutant concentrations measured (without the test cell) immediately before and immediately after the test.",
  "references": [
    "40 CFR 58.1 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/corrected-concentration/"
}