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Related Concept Videos

Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

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In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
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Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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The representative heuristic describes a biased way of thinking, in which you unintentionally stereotype someone or something. For example, you may assume that your professors spend their free time reading books and engaging in intellectual conversation, because the idea of them spending their time playing volleyball or visiting an amusement park does not fit in with your stereotypes of professors.
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Updated: Feb 7, 2026

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
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Towards characterizing LNAPL remediation endpoints.

Kaveh Sookhak Lari1, John L Rayner2, Greg B Davis3

  • 1CSIRO Land and Water, Private Bag No. 5, Wembley, WA, 6913, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Australia; School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA, 6027, Australia.

Journal of Environmental Management
|July 23, 2018
PubMed
Summary
This summary is machine-generated.

Determining when to stop engineered remediation for light non-aqueous phase liquids (LNAPLs) is crucial. This study simulated various LNAPL remediation techniques, providing conservative endpoints for effective cleanup assessment.

Keywords:
EndpointLNAPL remediationMulti-componentMulti-phaseSimulation

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Chemical Engineering

Background:

  • Remediating sites contaminated with light non-aqueous phase liquids (LNAPLs) presents significant challenges, often requiring prolonged efforts.
  • Assessing the long-term effectiveness of remediation technologies is vital for determining appropriate cessation points for engineered remedial actions.

Purpose of the Study:

  • To simulate and evaluate the long-term effectiveness of various LNAPL remediation approaches.
  • To establish conservative remediation endpoints for LNAPL cleanup based on simulated field conditions.

Main Methods:

  • A multi-phase, multi-component simulation approach was used to model LNAPL remediation.
  • Simulations included skimming and vacuum-enhanced skimming, with and without water table drawdown, across diverse soil types and LNAPL conditions.
  • Benzene persistence and mass removal were investigated as key risk indicators.

Main Results:

  • The time to achieve technology endpoints varied significantly, ranging from 2 to 6 years across 80 simulation scenarios.
  • Recovered LNAPL mass in liquid phase ranged from 5% to 53% of the initial mass; recovered vapor mass was also quantified.
  • Conservative remediation endpoints were determined for various field conditions and release incidents.

Conclusions:

  • The study provides valuable graphical outcomes for conservative LNAPL remediation endpoints.
  • These endpoints can inform decisions regarding the continuation or halting of engineered remedial efforts for LNAPL-contaminated sites.
  • Further research could incorporate induced biodegradation into the assessment of mass loss.