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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Updated: Oct 21, 2025

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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銀河間媒体の金属性の大きな変動

Annalisa De Cia1, Edward B Jenkins2, Andrew J Fox3

  • 1Department of Astronomy, University of Geneva, Versoix, Switzerland. annalisa.decia@unige.ch.

Nature
|September 9, 2021
PubMed
まとめ
この要約は機械生成です。

恒星間介質 (ISM) は有意な金属性の変化を示し,塵を補正した測定では,以前に想定したよりも低い量を示した. 高速の雲から集まったガスが 銀河の円盤にうまく混じり合っていないことを示しています

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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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関連する実験動画

Last Updated: Oct 21, 2025

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Published on: June 13, 2015

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科学分野:

  • 天文学と天体物理学
  • 宇宙化学

背景:

  • 恒星間介質 (ISM) は様々なガスと塵で構成されています.
  • 銀河盤の金属性は,化学的進化モデルではしばしば均一であると考えられています.
  • 塵の枯渇は,気体金属性の正確な測定を複雑にする.

研究 の 目的:

  • 中性ISMの粉塵補正された金属性を決定する.
  • 地元のISMにおける金属性の変動の範囲を調査する.
  • ISMの化学的均一性に対する加熱ガスの影響を理解する.

主な方法:

  • 紫外線吸収線スペクトロスコーピーを利用して,ISMの化学濃度を測定した.
  • 固い粒に組み込まれた金属を考慮するために,適用された粉塵補正技術.
  • ミルクウェイの25の星のデータを分析した.

主要な成果:

  • ニュートラルなISMの金属性の変動が報告され,10倍に及ぶ.
  • 標準偏差0.28デクスの平均金属度55±7%を発見した.
  • 観測された地域は,太陽の金属度が17%以下で,重要な不均一性を示しています.

結論:

  • ISMは化学的不均一性を示し,よく混合された太陽金属性ガス円盤の仮定に異議を唱える.
  • 高速の雲を通した原始ガス蓄積は,これらの観測された金属性の変動の原因である.
  • 低金属度加減ガスの不効率な混合は,同時代の星における金属度偏差を説明する可能性がある.