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In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective. 
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Antimony contamination, consequences and removal techniques: A review.

Jiayu Li1, BoHong Zheng2, Yangzhuo He3

  • 1College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; School of Architecture and Art, Central South University, Changsha 410083, China; College of Architecture and Civil Engineering, Hunan University of Arts And Science, Changde 41500, China.

Ecotoxicology and Environmental Safety
|March 18, 2018
PubMed
Summary

Antimony (Sb) contamination poses a severe environmental and health risk due to its widespread industrial and agricultural use. This review details Sb chemistry, toxicity, and effective removal techniques for environmental remediation.

Keywords:
Antimony contaminationAntimony sourcesHealth hazardsRemoval techniques

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Area of Science:

  • Environmental Science
  • Toxicology
  • Chemical Engineering

Background:

  • Antimony (Sb) compounds are extensively used in industry and agriculture, leading to significant environmental release.
  • Exposure to antimony and antimonides presents serious health risks, including potential fatality.

Purpose of the Study:

  • To review the chemistry, environmental distribution, and health threats associated with antimony.
  • To comprehensively analyze current and emerging techniques for antimony removal from the environment.

Main Methods:

  • Literature review of antimony chemistry, toxicity, and environmental fate.
  • Systematic evaluation of various antimony removal technologies: adsorption, coagulation/flocculation, membrane separation, electrochemical methods, ion exchange, and extraction.

Main Results:

  • Detailed overview of antimony's environmental entry pathways and toxicological impacts.
  • Comparative analysis of removal techniques, focusing on advantages, disadvantages, economic feasibility, and recent advancements.

Conclusions:

  • Effective antimony removal strategies are crucial for mitigating environmental contamination and protecting human health.
  • A thorough understanding of technique performance, economic factors, and experimental conditions is essential for successful Sb remediation.