Total Hydrocarbon Equivalent

{
  "id": "MLC-T-ENV-028279",
  "term": "Total Hydrocarbon Equivalent",
  "field": "Environment",
  "definition": "1. Sum of the carbon mass contributions of non-oxygenated hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as gasoline-fueled vehicle hydrocarbons. The hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1. Total Hydrocarbon Equivalent is abbreviated THCE.\n\n2. Sum of the carbon mass contributions of non-oxygenated hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as petroleum-fueled engine hydrocarbons. The hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1.\n\n3. Meaning given in 40 CFR 1065.1001. This generally means the sum of the carbon mass contributions of non-oxygenated hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as exhaust hydrocarbon from petroleum-fueled locomotives. The atomic hydrogen-to-carbon mass ratio of the equivalent hydrocarbon is 1.85:1. [40 CFR 1033.901 (CFR 2013)][40 CFR 1037.801 (CFR 2013)][40 CFR 1039.801 (CFR 2013)][40 CFR 1042.901 (CFR 2013)]\n\n4. Meaning given in 40 CFR 1065.1001. [40 CFR 1048.801 (CFR 2013)]\n\n5. Meaning given in 40 CFR 1065.1001. This generally means the sum of the carbon mass contributions of non-oxygenated hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as exhaust hydrocarbon from petroleum-fueled engines. The atomic hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1.\n\n6. Sum of the carbon mass contributions of non-oxygenated hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as exhaust hydrocarbon from petroleum-fueled engines. The hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1.\n\n7. Sum of the carbon mass emissions of non-oxygenated hydrocarbons, methanol, formaldehyde or other organic compounds that are separately measured, expressed as gasoline-fueled vehicle hydrocarbons. In the case of exhaust emissions, the hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1. In the case of diurnal and hot soak emissions, the hydrogento-carbon ratios of the equivalent hydrocarbons are 2.33:1 and 2.2:1, respectively. [40 CFR 86.1803-01 (CFR 2018)]\n\n8. Sum of the carbon mass contributions of non-oxygenated hydrocarbons, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as exhaust hydrocarbon from petroleum-fueled engines. The hydrogen-to-carbon ratio of the equivalent hydrocarbon is 1.85:1. This generally means the sum of the carbon mass contributions of non-oxygenated hydrocarbon, alcohols and aldehydes, or other organic compounds that are measured separately as contained in a gas sample, expressed as exhaust hydrocarbon from petroleum-fueled engines.",
  "abbreviation": "THCE",
  "references": [
    "40 CFR 92.2 (CFR 2013)",
    "40 CFR 94.2 (CFR 2013)",
    "40 CFR 1045.801 (CFR 2013)",
    "40 CFR 1051.801 (CFR 2013)",
    "40 CFR 1065.1001 (CFR 2013)",
    "40 CFR 86.090-2 (CFR 2018)",
    "86 FR 34308; 40 CFR 1054.801 (CFR 2021)"
  ],
  "url": "https://mlchart.com/terminology/environment/total-hydrocarbon-equivalent/"
}