一个古老的经典的新视角:实施基于SERS的水硬度定位
Ngoc Mai Duong1, Angélina Noclain1, Victoria E Reichel1
1Laboratoire Matière et Systèmes Complexes, UMR 7057, Université Paris Cité, CNRS, 10 rue Alice Domon et Léonie Duquet, 75013, Paris, France.
The Analyst
|July 7, 2023
概括
本研究引入了一种无校准的定量表面增强拉曼光谱法 (SERS) 方法,用于测试水的硬度. 该技术使用色度指标指标.
科学领域:
- 分析化学 分析化学
- 频谱学是一种光谱学.
- 环境科学 环境科学
背景情况:
- 表面增强拉曼光谱 (SERS) 是一种强大的分析技术,但其常规应用受到信号不可重复性和校准挑战的限制.
- 准确地确定水的硬度对于环境监测和公共卫生至关重要.
- 现有的定量SERS方法通常需要复杂的校准程序,阻碍了现场应用.
研究的目的:
- 开发一种定量表面增强拉曼光谱法 (SERS) 方法来确定水的硬度,而不需要外部校准.
- 为基于SERS的终点检测适应色度体积定位程序.
- 评估开发的方法对现实世界水样的准确性和适用性.
主要方法:
- 适应了对水硬度进行色度体积定位.
- 使用复杂度指标的表面增强拉曼光谱 (SERS) 信号监测定位的进展.
- 通过SERS信号的突然跳跃来确定等价点.
主要成果:
- 开发的方法成功地确定了三种矿泉水样本中的水硬度,这些样本具有不同的双价金属度 (系数为25).
- 在等效点上的SERS信号跳跃作为可靠的终点标记.
- 该程序显示了令人满意的准确性,可以在不到一个小时内完成.
结论:
- 已经建立了一种新的,无校准的定量SERS方法来分析水的硬度.
- 该技术消除了对实验室级设备的需求,使其适用于现场测量.
- 这种方法显著提高了SERS用于水质评估的实用性和可访问性.
更多相关视频
07:21Author Spotlight: Advancing Agricultural Land Ecosystem Research with a Hydraulic Property Analyzer to Assess Soil Health
Published on: August 9, 2024
1.0K
08:09Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity
Published on: August 19, 2018
9.2K
相关概念视频
00:43Complexometric Titration: Ligands
1.0K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
1.0K
01:19Precipitation Titration: Endpoint Detection Methods
1.9K
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.
In the Volhard method, a standard excess of AgNO3 is first added to the...
In the Volhard method, a standard excess of AgNO3 is first added to the...
1.9K
01:23EDTA: Indirect and Alkalimetric Titration
1.0K
Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
1.0K
01:18Titration of Polyprotic Base with a Strong Acid
835
The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
835
01:31Potentiometric Titration: Overview
1.6K
Potentiometric titration is a quantitative analytical technique that determines the concentration of an analyte by measuring the potential difference between the two electrodes in the solution. The endpoint of a potentiometric titration is the point at which there is a significant change in the potential difference. It occurs when the stoichiometric reaction between the analyte and the titrant is complete. The endpoint is usually determined graphically by plotting the measured potential...
1.6K
01:20Titration of a Weak Base with a Strong Acid
5.3K
The titration curve of a weak base like ammonia with a strong acid like hydrochloric acid is the mirror image of the titration curve of a weak acid with a strong base.
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
5.3K