饮用水样本中的的确定和特异化,采用X射线光谱技术
Piyali Deb Barman1, Ashok Kumar Maurya2,3, Mukul Madaan1
1Geological Survey of India, Eastern Region, Salt Lake Sector-2, Kolkata, 700091, India.
概括
由于的毒性,饮用水中的物种化是至关重要的. 这项研究引入了一种简单的波长分散式X射线光 (WD-XRF) 方法,用于在没有先前分离的情况下直接分析的物种化.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
背景情况:
- 是首要的污染物,有毒物种如 (As(III)) 构成全球健康风险,主要是通过受污染的饮用水.
- 精确的分类和分离对于有效的风险评估和整治策略至关重要.
- 现有的物种化方法可能是复杂和耗时的.
研究的目的:
- 开发一种使用波长分散式X射线光 (WD-XRF) 在水样中的物种化简单直接的方法.
- 为了证明WD-XRF在固体矩阵上吸附的酸盐和酸盐物种之间的区别的能力.
- 使用开发的方法,确定总及其物种的检测和量化极限.
主要方法:
- 使用WD-XRF进行了的特异化,分析了价值到核心 (VtC) 电子过渡 (AsKβ2,5光线).
- 活性化被用作固体相吸收剂,直接从水样中捕获酸盐和酸盐物种.
- 总的确定使用了AsKα1,2分析线.
主要成果:
- WD-XRF方法允许直接分类,而不需要分离As (III) 和As (V) 种类.
- 总的仪器检测和量化极限分别为0.23μg/L和0.89μg/L.
- 为了特异化,检测和量化极限分别确定为50μg/L和200μg/L.
结论:
- WD-XRF为物种分析提供了一种新且直接的方法,适用于固相提取吸附剂.
- 这种技术简化了的分类,使其成为环境监测和健康风险评估的宝贵工具.
- 该方法适用于含有两种物种的吸附剂的直接分析,这代表了分析的重大进步.
相关概念视频
Atomic Absorption Spectroscopy: Lab
457
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...
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
457
Atomic Emission Spectroscopy: Overview
2.3K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
2.3K
Atomic Absorption Spectroscopy: Overview
2.2K
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...
When irradiated by EMR of a particular wavelength, these...
2.2K
Precipitation and Co-precipitation
1.8K
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...
1.8K
Atomic Emission Spectroscopy: Instrumentation
497
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers. Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
497
Atomic Emission Spectroscopy: Lab
171
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...
171


