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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

170
Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
170

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Health- and vegetative-based effect screening values for ethylene.

Neeraja K Erraguntla1, Roberta L Grant1

  • 1Texas Commission on Environmental Quality, Toxicology Division, Austin, TX, USA.

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|March 3, 2015
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Ethylene (ET) is a common environmental gas. While concerns exist about its conversion to ethylene oxide (EtO), studies show ET is not a human carcinogen, and vegetation-based limits protect public health.

Keywords:
EthyleneEthylene oxideHealth effectsTexasVegetation effects

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Area of Science:

  • Environmental Science
  • Toxicology
  • Public Health

Background:

  • Ethylene (ET) is naturally and anthropogenically produced, with natural sources dominating.
  • Concerns about ET toxicity stem from its metabolic conversion to ethylene oxide (EtO), a known carcinogen.
  • ET affects plant species at lower concentrations than those adverse to humans.

Purpose of the Study:

  • To assess the health and welfare (odor and vegetation) impacts of ethylene (ET).
  • To establish health and vegetation-based toxicity factors for ET in accordance with TCEQ guidelines.
  • To determine appropriate Effect Screening Levels (ESLs) for air permit reviews and monitoring.

Main Methods:

  • Conducted detailed health and welfare-based assessments of ET.
  • Utilized well-conducted animal toxicity studies for health assessments.
  • Performed a weight-of-evidence evaluation of potential mutagenic and carcinogenic modes of action.

Main Results:

  • Health-based assessments yielded higher ESLs than vegetation-based thresholds.
  • Metabolic conversion of ET to EtO was deemed insufficient to pose a cancer risk.
  • Short-term vegetation-based ESL: 1200 ppb; Chronic vegetation-based ESL: 30 ppb.

Conclusions:

  • TCEQ's acute and chronic ESLs for vegetation are protective of public health.
  • Vegetation-based ESLs are significantly lower than health-based ESLs, ensuring broader protection.
  • The established ESLs safeguard the general public, including vulnerable populations, from adverse effects.