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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Solid-phase extractions in flow analysis.

Fábio R P Rocha1, Alex D Batista2, Wanessa R Melchert3

  • 1Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba, SP, Brazil.

Anais Da Academia Brasileira De Ciencias
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Summary
This summary is machine-generated.

Solid-phase extraction (SPE) coupled with flow systems enhances analytical precision and sample throughput. This review covers SPE mechanization, system design, and applications for improved analyte detection and separation.

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Solid-phase extraction (SPE) mechanization improves precision, throughput, and reduces errors.
  • Integrating SPE with flow systems enhances analyte detectability and selectivity.

Purpose of the Study:

  • To review historical aspects, key developments, and applications of SPE in flow systems.
  • To discuss system design, novel materials, and techniques for analyte separation and concentration.

Main Methods:

  • Review of literature on SPE coupled with flow systems.
  • Analysis of packed and fluidized particle applications.
  • Discussion of novel sorbents and stationary phases.

Main Results:

  • SPE mechanization offers significant advantages in analytical workflows.
  • Effective analyte concentration and separation are crucial for flow analysis.
  • Various SPE formats (mini-columns, beads, magnetic materials) are applicable.

Conclusions:

  • Coupling SPE to flow systems represents a synergistic advancement in analytical science.
  • SPE is vital for sample treatment, analyte concentration, and enhancing detection.
  • Future directions include novel materials and direct solid-phase measurements (optosensing).