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Related Concept Videos

Plasticizers01:31

Plasticizers

Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
Superplasticizers01:30

Superplasticizers

Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
Environmental Applications of Microorganisms01:30

Environmental Applications of Microorganisms

Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
Microbial Wastewater Treatment01:30

Microbial Wastewater Treatment

Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
Microbial Bioremediation of Plastics01:28

Microbial Bioremediation of Plastics

Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...

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Updated: Jul 1, 2026

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Advancing Evaluation of Microplastics Thresholds to Inform Water Treatment Needs and Risks.

Omar S Chowdhury1, Philip J Schmidt1, William B Anderson1

  • 1Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.

Environment & Health (Washington, D.C.)
|July 25, 2024
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Summary

A new framework helps assess health risks from microplastics in drinking water. It evaluates contaminant levels on microplastics to guide treatment strategies and ensure safe water supplies.

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Area of Science:

  • Environmental Science
  • Public Health
  • Water Treatment

Background:

  • Growing concern exists regarding chemical contaminants adsorbed by microplastics in drinking water.
  • Current strategies for evaluating microplastic-related health risks and necessary treatments are lacking.
  • Microplastics may pose health risks if adsorbed contaminant concentrations exceed drinking water guidelines.

Purpose of the Study:

  • To develop a framework for evaluating potential human health risks from microplastics in drinking water.
  • To establish a method for identifying treatment targets to manage risks associated with microplastics.
  • To provide a science-based screening tool for water providers to assess the need for risk assessment or treatment modification.

Main Methods:

  • Development of a "Threshold Microplastics Concentration" (TMC) framework.
  • Utilizing adsorption capacity to evaluate worst-case scenarios for contaminant exposure.
  • Assessing whether waterborne microplastic concentrations could lead to intake of regulated contaminants.

Main Results:

  • The TMC framework provides a method to evaluate potential health concerns from microplastics in drinking water.
  • Exceeding the TMC indicates a need for further risk assessment or treatment evaluation.
  • The framework helps identify treatment targets for managing health risks.

Conclusions:

  • The TMC framework is an updateable, science-based tool for screening microplastic risks in potable water.
  • It assists in determining the necessity of detailed risk assessments or treatment adjustments.
  • The framework supports drinking water providers in managing potential health risks from microplastics.