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Related Concept Videos

Types of Toxins01:36

Types of Toxins

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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.
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Halogens03:01

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Alkyl Halides02:45

Alkyl Halides

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Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
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Effects of Chemicals: Overview01:27

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Drugs, encompassing various chemical compounds from natural sources, lab synthesis, or genetic engineering, elicit different biological responses in living organisms. Some of these responses are desirable or therapeutic, while others are undesirable. The primary goal of administering a drug is to achieve a therapeutic effect, that is, to address a specific disease or health condition. Any concurrent effects outside of this therapeutic outcome are considered undesirable. These undesirable...
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The Periodic Table and Organismal Elements01:27

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Elements are the smallest units of matter that cannot be broken down further by chemical processes. There are 118 known elements, but not all of these are naturally occurring, and only a few of them are essential for life. Living matter is composed primarily of carbon, nitrogen, hydrogen, and oxygen, with smaller amounts of other elements like calcium, phosphorus, potassium, and sulfur. Other elements are also necessary for life but only in trace amounts.
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Atomic Fluorescence Spectroscopy01:29

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Related Experiment Video

Updated: Apr 9, 2026

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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Perfluorinated Alkyl Substances: Emerging Insights Into Health Risks.

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Summary

Perfluorooctanoic acid and perfluorooctane sulfonate, widely used industrial chemicals, pose significant immunotoxicity and carcinogenicity risks. Current drinking water limits may be too high, underestimating health dangers from incompletely tested substances.

Keywords:
carcinogenexposure limitimmunotoxicantperfluorinated octanoic acidperfluorooctane sulfonaterisk assessment

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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Public Health

Background:

  • Perfluorinated alkyl substances (PFAS) have been used for over 60 years, initially perceived as inert and non-toxic.
  • Emerging toxicity data on perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) indicate potential health risks.
  • These chemicals are detected in humans and the environment, raising public health concerns.

Purpose of the Study:

  • To review the evolving understanding of PFOA and PFOS toxicity.
  • To assess the adequacy of current regulatory limits for PFOA and PFOS in drinking water.
  • To highlight the public health implications of underestimating risks from incompletely tested chemicals.

Main Methods:

  • Literature review of toxicological studies on PFOA and PFOS.
  • Analysis of historical and recent research publications.
  • Comparison of current toxicological data with existing regulatory standards.

Main Results:

  • Early studies from over 30 years ago indicated immunotoxicity and carcinogenicity of PFOA and PFOS.
  • Recent research has intensified, revealing these risks are relevant at prevalent exposure levels.
  • Existing drinking water limits, based on pre-2008 data, may be over 100-fold too high.

Conclusions:

  • Carcinogenicity and immunotoxicity are significant risks associated with PFOA and PFOS exposure.
  • Current regulatory standards for PFOA and PFOS may not adequately protect public health.
  • Assuming the safety of incompletely tested industrial chemicals can lead to underestimated health risks and public health implications.