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相关概念视频

Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

289
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
289
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

740
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
740
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

302
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
302
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

133
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
133
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

283
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
283
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

221
Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
221

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相关实验视频

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Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies
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在鱼样中通过直接固体样本分析直接确定铜的简单方法 Line-Source GFAASAS GFAAS

Matheus Fernandes Filgueiras1, Marie Novotná2, Michaela Vašinová Galiová2

  • 1Rio de Janeiro State University, Graduate Program in Chemical Engineering, Rua São Francisco Xavier 524, Rio de Janeiro 20550-013, Brazil.

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概括

本研究介绍了一种使用石墨炉原子吸收光谱学在鱼粉中直接分析铜 (Cu) 的简单方法. 该技术在固体食品样本中提供可靠和敏感的Cu量化.

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科学领域:

  • 分析化学 分析化学
  • 环境科学 环境科学
  • 食品科学 食品科学 食品科学

背景情况:

  • 准确地确定鱼类等食品矩阵中的铜 (Cu) 对于营养和安全评估至关重要.
  • 对于元素分析的传统方法通常需要广泛的样本消化,增加复杂性和错误的可能性.
  • 直接固体样本分析为元素量化提供了更简单的方法.

研究的目的:

  • 开发和验证一种简单,可靠的方法,用于在粉状鱼样中直接测定铜.
  • 为了优化石墨炉原子吸收光谱学 (GFAAS) 参数用于固体样本分析.
  • 评估拟议的测量鱼组织中铜量化方法的准确性和灵敏性.

主要方法:

  • 直接使用实验室制造的设备进行固体样品分析,使用玻璃毛细管进行样品处理.
  • 线源石墨炉原子吸收光谱仪 (GFAAS) 用于检测铜.
  • 热解 (1100°C) 和原子化 (2400°C) 温度的优化.
  • 外部校准使用水溶液进行量化.

主要成果:

  • 最优化的方法实现了高灵敏度,检测和量化极限分别为0.04 ng g-1和0.12 ng g-1.
  • 用水性标准进行外部校准,可在粉状鱼样中准确量化铜.
  • 直接固体样本分析方法被证明是简单,可靠和有效的铜的确定.

结论:

  • 使用GFAAS开发的直接固体样本分析方法是用于鱼类中铜的可行和有效的技术.
  • 这种方法简化了样本准备,使元素分析更容易获得.
  • 该方法的可靠性和灵敏性支持其在常规食品分析和质量控制中的应用.