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Organic Compounds03:02

Organic Compounds

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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Chromatographic Methods: Classification01:12

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Chromatographic techniques are classified in three ways: the classification is based on the physical state of the stationary and mobile phases, how the mobile phase and the stationary phase contact each other, or through the chemical or physical processes that isolate the components of the sample. Typically, the mobile phase is either a liquid or gas, while the stationary phase is either a solid or a liquid layer applied to a solid surface.
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Chromatographic Methods: Terminology01:18

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Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...
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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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Gravimetry: Inorganic And Organic Precipitating Agents00:49

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In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
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High-Throughput Measurement and Classification of Organic P in Environmental Samples
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Volatile organic compounds in water matrices: Recent progress, challenges, and perspective.

Xin Jin1, Yingji Wu1, Madhappan Santhamoorthy2

  • 1Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China.

Chemosphere
|August 29, 2022
PubMed
Summary

This study determined volatile organic compound (VOC) concentrations in water, finding tetrachloroethylene, m,p-xylene, and toluene were most prevalent. China showed the highest pollution and carcinogenic risk from VOCs.

Keywords:
Meta-analysisProbabilistic health risk assessmentUncertaintyVolatile organic compoundsWater matrices

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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Public Health

Background:

  • Volatile organic compounds (VOCs) are carbon-based chemicals easily vaporized, posing environmental risks.
  • Understanding VOC levels in water is crucial for assessing ecological and human health impacts.

Purpose of the Study:

  • To quantify concentrations of specific VOCs in various water matrices.
  • To identify prevalent VOCs and compare pollution levels across different countries.
  • To assess the carcinogenic risk associated with detected VOCs.

Main Methods:

  • Analysis of VOC concentrations in water samples.
  • Comparative study of pollution levels across countries.
  • Monte-Carlo simulation for carcinogenic risk assessment.

Main Results:

  • Tetrachloroethylene, m,p-xylene, and toluene were the most abundant VOCs in water.
  • China exhibited the highest VOC concentrations and the sole carcinogenic risk.
  • While average VOC levels were within acceptable limits, heptachlor posed a slight carcinogenic risk to 25% of the population.

Conclusions:

  • Water matrices can contain significant levels of harmful VOCs.
  • China faces a unique challenge with high VOC pollution and associated health risks.
  • Targeted monitoring and risk management are necessary, especially for compounds like heptachlor.