基于激光诱导击穿光谱的基体效应

姚胤旭; 邱荣; 万情; 杨怡; 史晋芳; 王慧丽; 周强

doi:10.11884/HPLPB202335.230126

基于激光诱导击穿光谱的基体效应

doi: 10.11884/HPLPB202335.230126

姚胤旭^{1, 2,},
邱荣^{1, 2, ,},
万情³,
杨怡^{1, 2},
史晋芳¹,
王慧丽^{1, 2},
周强^{1, 2}

1.
西南科技大学极端条件物质特性联合实验室，四川绵阳 621010
2.
西南科技大学数理学院，四川绵阳 621010
3.
陆军勤务学院教研保障中心，重庆 401331

基金项目: 国家自然科学基金项目（11972313）；国家自然科学基金委员会与中国工程物理研究院联合基金项目（U1530109）；中国科学院光谱成像技术重点实验室基金项目（LSIT202001W）

详细信息

作者简介:
姚胤旭，1904851468@qq.com

通讯作者:
邱　荣， 43951700@qq.com。

中图分类号: O433.4
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-11
- 修回日期: 2023-06-02
- 录用日期: 2023-09-26
- 网络出版日期: 2023-10-11
- 刊出日期: 2023-11-11

Matrix effect based on laser-induced breakdown spectroscopy

Yao Yinxu^{1, 2
,},
Qiu Rong^{1, 2
, ,},
Wan Qing³,
Yang Yi^{1, 2},
Shi Jinfang¹,
Wang Huili^{1, 2},
Zhou Qiang^{1, 2}

1.
Joint Laboratory of Extreme Conditions Material Properties, Southwest University of Science and Technology, Mianyang 621010, China
2.
School of Mathematics and Science, Southwest University of Science and Technology, Mianyang 621010, China
3.
Teaching and Research Support Center, Army Service Academy, Chongqing 401331, China

摘要

摘要: 为分析和改善激光诱导击穿光谱技术（LIBS）在定量分析土壤和大米中镉（Cd）元素含量时基体效应对分析结果的影响，以Cd Ⅱ 226.502 nm谱线为分析对象，对比研究了基体种类、KCl质量分数和激发方式等对Cd Ⅱ 226.502 nm谱线强度和定量分析结果的影响规律。研究结果表明：基体主成分的化学形态和电离能是产生基体效应的主要因素，KCl作为添加剂能明显改善大米中Cd Ⅱ 226.502 nm的谱线强度，光电双脉冲激发能显著增强基体中Cd Ⅱ 226.502 nm的谱线强度、稳定性并提高信噪比。与单激光脉冲激发方式相比，在光电双脉冲激发下，SiO₂、土壤和大米三种基体中Cd Ⅱ 226.502 nm的检测下限分别从372、332和2874 mg·kg⁻¹降低到42、72和37 mg·kg⁻¹。
- 基体效应 /
- 化学键 /
- 电离能 /
- 原子化 /
- 等离子体参数
Abstract: To analyze and improve the matrix effect on the quantitative analysis of cadmium (Cd) concentration in soil and rice using laser induced breakdown spectroscopy (LIBS), this article takes the Cd Ⅱ 226.502 nm spectral line as the analysis object, and compares the effects of matrix type, KCl mass concentration, and excitation method on the intensity and quantitative analysis results of Cd Ⅱ 226.502 nm spectral line. The results show that the chemical form of the main components of the matrix and the ionization energy are the main factors that produce the matrix effect. KCl as an additive can significantly improve the spectral line intensity of Cd Ⅱ 226.502 nm in rice. The photoelectric double pulse excitation can significantly enhance the spectral line intensity and stability of Cd Ⅱ 226.502 nm in the matrix, and improve the signal to noise ratio. Compared with the single laser pulse excitation method, the lower detection limit of Cd Ⅱ 226.502 nm in silicon dioxide, soil, and rice matrices decreased from 372, 332 and 2874 mg·kg⁻¹ to 42, 72 and 37 mg·kg⁻¹, respectively, under photoelectric dual pulse excitation. This study has important reference value for the development of LIBS technology and its application and promotion in the field of soil and food pollution detection.
- matrix effect /
- chemical bond /
- ionization energy /
- atomization /
- plasma parameter

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图 1 LIBS实验装置示意图

Figure 1. Schematic diagram of LIBS experimental device

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图 2 三种基体在两种激发方式下Cd Ⅱ 226.502谱线的强度特征

Figure 2. Comparison of Cd Ⅱ 226.502 spectral line intensities in different matrices under two excitation methods

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图 3 单激光脉冲激发下Cd Ⅱ 226.502 nm谱线强度随KCl质量分数变化的特征

Figure 3. Changes in the intensity of Cd Ⅱ 226.502 spectral lines with KCl mass fraction

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图 4 等离子体温度和电子密度随KCl质量分数变化的特征

Figure 4. Changes of electron temperature and electron density with KCl mass fraction in plasma

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图 5 三种基体在两种激发方式下Cd Ⅱ 226.502 nm的定标曲线

Figure 5. Calibration curves of Cd Ⅱ 226.502 nm line under two excitation methods

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表 1 D和E组标准样品中镉元素和氯化钾的质量分数

Table 1. Mass fractions of cadmium and potassium chloride in standard samples of groups D and E

sample	mass fraction/%		sample	mass fraction/%
sample	Cd	KCl	sample	Cd	KCl
D₁	1	0	E₁	0.2	0
D₂	1	3	E₂	0.2	3
D₃	1	6	E₃	0.2	6
D₄	1	9	E₄	0.2	9
D₅	1	12	E₅	0.2	12

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表 2 F、G和H三组标准样品中镉元素的质量分数

Table 2. Mass fractions of cadmium in three groups (F, G, and H) of standard samples

sample	mass fraction/%	sample	mass fraction/%	sample	mass fraction/%
F₁	0.004	G₁	0.004	H₁	0.004
F₂	0.010	G₂	0.010	H₂	0.010
F3	0.020	G₃	0.020	H₃	0.020
F₄	0.040	G₄	0.040	H₄	0.040
F₅	0.100	G₅	0.100	H₅	0.100
F₆	0.200	G₆	0.200	H₆	0.200
F₇	0.400	G₇	0.400	H₇	0.400
−	−	−	−	H₈	1.000
−	−	−	−	H₉	2.000

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表 3 三种基体在两种激发方式下的定量分析结果

Table 3. Quantitative analysis results of three matrices under two excitation methods

	LOD / (mg·kg⁻¹)		R² /%		RSD / %
	355 nm	OEDB-LIBS	355 nm	OEDB-LIBS	355 nm	OEDB-LIBS
Group F sample (silica matrix)	372	42	93.5	97.6	13.604	7.232
Group G sample (soil matrix)	332	72	84.0	94.5	14.283	7.691
Group H sample (rice matrix)	2874	37	95.3	95.1	13.544	6.968

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