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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
Toxicity Testing in Animals01:23

Toxicity Testing in Animals

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...
Types of Toxins01:36

Types of Toxins

Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
Air pollutants, primarily gases, pose significant threats to respiratory health, leading to conditions like hypoxia, lung cancer, and in extreme cases, death.
Environmental pollutants like...
Toxicokinetics: Overview01:21

Toxicokinetics: Overview

Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least squares (OLS)...
Pharmaceutical Poisoning: Potential Scenarios01:26

Pharmaceutical Poisoning: Potential Scenarios

Pharmaceutical poisoning can occur through various channels, impacting an estimated 2 million hospitalized patients in the U.S. annually with serious adverse drug responses. These scenarios encompass both therapeutic uses, such as drug toxicity, where even standard dosages can lead to severe central nervous system depression, and non-therapeutic exposures, including accidental ingestion by children, and environmental and occupational exposures.Unintentional poisonings often involve exploratory...

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Related Experiment Video

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In Silico Modeling Method for Computational Aquatic Toxicology of Endocrine Disruptors: A Software-Based Approach Using QSAR Toolbox
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In Silico Modeling Method for Computational Aquatic Toxicology of Endocrine Disruptors: A Software-Based Approach Using QSAR Toolbox

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Off-site toxic consequence assessment: a simplified modeling procedure and case study.

Joe Guarnaccia1, Tom Hoppe

  • 1Ciba Specialty Chemicals, Expert Services, PO Box 71, Toms River, NJ 08754 USA. joseph.guarnaccia@cibasc.com

Journal of Hazardous Materials
|December 7, 2007
PubMed
Summary

Assess off-site chemical exposure risks using site data and public models. This method helps predict critical spill volumes for effective risk reduction and safety planning.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Risk Assessment

Background:

  • Assessing off-site exposure from toxic chemical releases is crucial for public safety.
  • Existing methods often require complex data compilation and specialized modeling.

Purpose of the Study:

  • To outline a methodology for assessing off-site exposure risks from toxic chemical spills.
  • To demonstrate the utility of screening-level public-domain models for risk analysis.

Main Methods:

  • Compiling site-specific operational, geographic, demographic, and meteorological data.
  • Utilizing public-domain screening-level modeling tools like RMP Comp, ALOHA, and DEGADIS.
  • Conducting event-based simulations with defined parameters for atmospheric conditions, receptor distances, and chemical properties.

Main Results:

  • The approach enables risk assessment for both catastrophic and plausible release scenarios.
  • Models can predict critical spill volumes necessary to cause significant off-site risk.
  • Identified key parameters influencing off-site exposure include terrain, gas buoyancy, and toxic endpoints.

Conclusions:

  • Screening-level models provide a practical approach to evaluating chemical release risks.
  • The methodology supports informed decisions on site storage, operations, and risk mitigation strategies.
  • This risk assessment framework aids in optimizing cost-effective safety measures.