开发与ETAAS和ICP-MS结合的云点提取方法,用于预缩和量化盐水样本中以纳米颗粒形式的银
María Carmen Barciela-Alonso1, Elena Peña-Vázquez2, Juan José López-Mayán3
1Trace Element, Spectroscopy and Speciation Group (GETEE), Faculty of Chemistry, Instituto de Materiais (iMATUS), University of Santiago de Compostela, Av. das Ciencias, s/n 15782, Santiago de Compostela, Spain. mcarmen.barciela@usc.es.
Mikrochimica acta
|July 2, 2025
概括
一种新的绿色分析方法在盐水样本中确定银纳米粒子 (AgNPs). 云点提取和电热原子吸收光谱学提供了一种简单,可靠的方法来测量水产养殖水中的AgNP.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 纳米技术纳米技术
背景情况:
- 银纳米粒子 (AgNPs) 的工业用途需要在复杂的环境矩阵中检测它们.
- 盐水环境,就像水产养殖水域一样,对准确的AgNP分析构成挑战.
研究的目的:
- 开发一种简单,绿色和可靠的分析方法,用于在盐水样本中确定AgNP.
- 为了验证该方法在水产养殖水分析方面的有效性.
主要方法:
- 云点提取 (CPE) 用于从海水中分离AgNP.
- 电热原子吸收光谱 (ETAAS) 用于在富含表面活性剂的提取物中测定银.
- 优化CPE参数,包括Triton X-114度,EDTA体积和pH值.
主要成果:
- 使用12%的Triton X-114,750微升EDTA和pH7.0的优化方法.
- 达到0.038μg L-1的检测极限 (LOD) 和0.125μg L-1.1的量化极限 (LOQ).
- 证明了高精度 (9.7%) 和准确性 (99±4%的回收),对AgNP比离子银具有良好的选择性.
结论:
- 开发的CPE-ETAAS方法适用于精确和准确地确定盐水样本中的AgNPs.
- 该方法显示出良好的选择性,在复杂矩阵中将AgNP与离子银分开.
- 验证的结果与补充技术如SP-ICP-MS和纳米粒子大小分析的TEM保持一致.
相关概念视频
01:19Precipitation Titration: Endpoint Detection Methods
2.1K
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...
2.1K
01:21Precipitation Titration Curve: Analysis
1.2K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.2K
01:03Precipitation Gravimetry
7.6K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
7.6K
01:17Precipitation and Co-precipitation
2.1K
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...
2.1K
01:18Effects of EDTA on End-Point Detection Methods
353
Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
353
01:09Colloidal precipitates
778
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
778