在-酸悬浮中分离和识别与溶解的有机物质复合物
Ghulam Hussain Qasim1, Lisa Harris2, Vaughn Mangal2
1Department of Civil and Environmental Engineering, Syracuse University, Syracuse, New York, USA.
Rapid communications in mass spectrometry : RCM
|January 14, 2025
概括
这项研究开发了一种使用固体相提取和FTICR-MS识别低度溶有机物 (Hg-DOM) 复合物的方法,揭示了对的洞察力.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 水生化学 水生化学
背景情况:
- (Hg) 与溶解有机物 (DOM) 的复杂化显著影响其在水生系统中的命运.
- 鉴定这些Hg-DOM复合体是具有挑战性的,因为低度和干扰离子.
研究的目的:
- 开发和验证一种方法来隔离和识别与溶解的有机物 (Hg-DOM) 复合物.
- 获取有关水生环境中的物种化,生物可用性和转变的见解.
主要方法:
- 固相提取 (SPE) 用于将Hg-DOM复合物从酸悬浮物中分离出来.
- 使用超高分辨率的里埃转换离子循环子子共振质谱法 (FTICR-MS) 进行了对Hg-DOM复合体的假定识别.
- 与环中性pH的PPL弹相比,C18 SPE弹在提取Hg-DOM复合物方面表现出更高的效率.
主要成果:
- SPE与FTICR-MS相结合,有效地隔离和识别了Hg-DOM复合体.
- 在C18 SPE方法中,发现了8个Hg-DOM复合体,其性能优于PPL弹,而PPL弹发现了2个.
- 一个特定的含分子 (C8H13HgN2O2S) 始终被确定,表明该方法的稳定性.
结论:
- 开发的SPE-FTICR-MS方法对于表征Hg-DOM复合体是有效的.
- 这种方法增强了对水物种化,生物可用性和水生生态系统中的运输的理解.
- 这项研究为研究环境相关度的Hg-DOM相互作用提供了一条途径.
相关概念视频
Extraction: Advanced Methods
407
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
407
Precipitation and Co-precipitation
1.7K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.7K
Sample Preparation for Analysis: Advanced Techniques
298
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...
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...
298
Qualitative Analysis
21.5K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
21.5K
Gravimetry: Inorganic And Organic Precipitating Agents
1.1K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
1.1K
Mass Spectrometry: Complex Analysis
705
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
705


