相关实验视频

Updated: Jun 17, 2025

Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants

Dependence of Laser-induced Breakdown Spectroscopy Results on Pulse Energies and Timing Parameters Using Soil Simulants

Published on: September 23, 2013

使用激光诱导分解光谱学对土壤中的Pb进行定量分析,基于导电材料的信号增强

Shefeng Li¹, Qi Zheng¹, Xiaodan Liu²

¹School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China.

Molecules (Basel, Switzerland)

|August 10, 2024

概括

这项研究通过添加导电材料 (如NaCl和石墨) 来提高使用激光诱导分解光谱 (LIBS) 的土壤重金属检测. 石墨提高了检测的准确性,为环境监测提供了可靠的方法.

科学领域:

环境科学环境科学
分析化学分析化学
频谱学是一种光谱学.

背景情况:

准确的土壤重金属检测对于监测污染,确保食品安全和改善土壤质量至关重要.
激光诱导分解光谱 (LIBS) 是一种有效的重金属检测工具,但受到土壤矩阵效应的影响,影响了定量准确性.
需要信号增强方法来克服土壤分析中的LIBS限制.

研究的目的:

通过LIBS.研究导电材料 (NaCl和石墨) 对土壤中 (Pb) 的定量检测的影响.
确定在土壤重金属测定中用于LIBS的可靠信号增强方法.
通过NaCl和石墨探索信号增强背后的机制.

主要方法:

研究了不同NaCl和石墨度对LIBS光谱强度,信号与背景比率 (SBR),信号与噪声比率 (SNR) 和相对标准偏差 (RSD) 的影响.
分析了剥离坑形状和等离子体参数 (温度,电子密度),以了解信号增强机制.
开发并比较单变量和多变量定量分析模型 (PLSR,LS-SVM,ELM) 用于Pb检测.

主要成果:

使用石墨的部分最小平方回归 (PLSR) 模型实现了最高的预测性能 (Rp = 0.994).
对于Pb I 405.78 nm光谱线的单变模型显示出出色的性能 (Rp = 0.984) ,低检测极限 (LOD) 为26.142 mg/kg.
导电材料显著提高了LIBS信号强度,并提高了对土壤的定量检测精度.

结论:

将LIBS与导电材料 (NaCl,石墨) 和化学测量方法相结合,为准确地检测土壤重金属提供了一个潜在的工具.
石墨证明有效地增强了LIBS信号,用于在土壤中定量确定.
这种方法为环境监测和土壤质量评估提供了宝贵的参考.

关键词:

Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb Pb 导电材料是一种导电材料.激光诱导的分解光谱学土壤土壤土壤土壤土壤

更多相关视频

Quantitative Analysis of Vacuum Induction Melting by Laser-induced Breakdown Spectroscopy

Quantitative Analysis of Vacuum Induction Melting by Laser-induced Breakdown Spectroscopy

Published on: June 10, 2019

Laser-induced Breakdown Spectroscopy: A New Approach for Nanoparticle's Mapping and Quantification in Organ Tissue

Laser-induced Breakdown Spectroscopy: A New Approach for Nanoparticle's Mapping and Quantification in Organ Tissue

Published on: June 18, 2014

相关概念视频

Atomic Emission Spectroscopy: Overview

Atomic Emission Spectroscopy: Overview

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...

Atomic Emission Spectroscopy: Lab

Atomic Emission Spectroscopy: Lab

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...