电位法基体效应在氟离子选择性电极分析中的影响

doi:10.3866/PKU.DXHX202209058

Abstract

Abstract:

Experiments on matrix effects in the fluoride selective-electrode-based potentiometric methods were performed to expand students' theoretical knowledge and deepen their understanding of matrix effects in the potentiometric method in the chemistry laboratory course. Complex matrices were simulated by doping ethanol or acetic acid gradiently into a standard solution. Comprehensive and systematic empirical verification and theoretical analysis of the matrix effects were conducted. Moreover, the standard curve and addition methods determining fluoride in different matrices were investigated and compared. The experimental results showed the matrix effects and the characteristics of the different quantitative analysis methods. This study provides students with an enhanced sense of experimental principles and expands their scientific thinking, which eventually helps achieve improved teaching and learning.

Key words: Matrix effect, Potentiometric method, Ion selective electrode, Standard curve method, Standard addition method

Lingli Zhao, Jiajie Zhang, Xiaofei Xu, Lingling Xi, Yuxiu Wei, Yunhu Tang, Xufeng Lin. Matrix Effects in Potentiometric Method on Fluoride Selective Electrode Analysis[J].University Chemistry, 2023, 38(8): 200-208.

Figures/Tables 8

References 17

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标样浓度/ (mol∙L⁻¹)	标准曲线法			一次标准加入法			连续标准加入法
标样浓度/ (mol∙L⁻¹)	测定浓度/ (mol∙L⁻¹)	绝对误差/ (mol∙L⁻¹)	相对误差/%	测定浓度/ (mol∙L⁻¹)	绝对误差/ (mol∙L⁻¹)	相对误差/%	测定浓度/ (mol∙L⁻¹)	绝对误差/ (mol∙L⁻¹)	相对误差/%
1.20 × 10⁻⁵	1.19 × 10⁻⁵	−9.71 × 10⁻⁸	−0.809	1.30 × 10⁻⁵	9.72 × 10⁻⁷	8.10	1.08 × 10⁻⁵	−1.08 × 10⁻⁶	−9.64
1.20 × 10⁻⁴	1.20 × 10⁻⁴	4.88 × 10⁻⁷	0.407	1.30 × 10⁻⁴	9.44 × 10⁻⁶	7.87	1.15 × 10⁻⁴	−4.82 × 10⁻⁶	−4.02
1.20 × 10⁻³	1.22 × 10⁻³	1.97 × 10⁻⁵	1.64	1.27 × 10⁻³	7.79 × 10⁻⁵	6.49	1.18 × 10⁻⁴	−1.96 × 10⁻⁵	−1.63

乙醇含量/%	标准曲线法		标准加入法
乙醇含量/%	测定浓度/(mol∙L⁻¹)	相对误差/%	测定浓度/(mol∙L⁻¹)	相对误差/%
0	1.02 × 10⁻³	1.64	1.05 × 10⁻³	5.34
5	1.32 × 10⁻³	32.0	9.88 × 10⁻⁴	−1.22
10	1.69 × 10⁻³	69.2	9.59 × 10⁻⁴	−4.09
20	2.67 × 10⁻³	167	9.24 × 10⁻⁴	−7.60
30	4.57 × 10⁻³	357	1.03 × 10⁻³	3.49

乙酸含量/%	pH	标准曲线法		标准加入法
乙酸含量/%	pH	测定浓度/(mol∙L⁻¹)	相对误差/%	测定浓度/(mol∙L⁻¹)	相对误差/%
0	5.54	1.03 × 10⁻³	2.64	1.01 × 10⁻³	0.630
5	3.38	7.72 × 10⁻⁴	−22.8	1.02 × 10⁻³	2.34
10	2.99	5.79 × 10⁻⁴	−42.1	1.03 × 10⁻³	2.80
20	2.63	3.69 × 10⁻⁴	−63.1	1.01 × 10⁻³	0.586
30	2.36	2.66 × 10⁻⁴	−73.4	9.93 × 10⁻⁴	−0.733

乙醇含量/%	回归方程	浓度区间/(mol∙L⁻¹)	R²
0	E = −5.56 × 10⁻²lgc_F⁻ + 2.29 × 10⁻²	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
5	E = −5.64 × 10⁻²lgc_F⁻ + 1.56 × 10⁻²	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
10	E = −5.78 × 10⁻²lgc_F⁻ + 4.20 × 10⁻³	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
20	E = −5.81 × 10⁻²lgc_F⁻ − 8.60 × 10⁻³	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
30	E = −5.89 × 10⁻²lgc_F⁻ − 2.39 × 10⁻²	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999

乙酸含量/%	回归方程	浓度区间/(mol∙L⁻¹)	R²
0	E = −5.61 × 10⁻²lgc_F⁻ + 1.94 × 10⁻²	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
5	E = −5.69 × 10⁻²lgc_F⁻ + 2.86 × 10⁻²	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
10	E = −5.91 × 10⁻²lgc_F⁻ + 2.69 × 10⁻³	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
20	E = −5.86 × 10⁻²lgc_F⁻ + 3.99 × 10⁻³	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999
30	E = −5.90 × 10⁻²lgc_F⁻ + 4.60 × 10⁻²	1.00 × 10⁻⁵–1.00 × 10⁻²	0.999

Matrix Effects in Potentiometric Method on Fluoride Selective Electrode Analysis

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References 17

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样品	稀释倍数	标准曲线法		标准加入法
样品	稀释倍数	测定浓度/(mol∙L⁻¹)	RSD/%	测定浓度/(mol∙L⁻¹)	RSD/%
红茶样品	0.25X	5.37 × 10⁻⁵	2.25	4.88 × 10⁻⁵	2.25
	0.5X	1.15 × 10⁻⁴	0	1.11 × 10⁻⁴	2.25
	1X	2.15 × 10⁻⁴	0	2.32 × 10⁻⁴	0
绿茶样品	0.25X	2.10 × 10⁻⁵	2.25	2.08 × 10⁻⁵	2.25
	0.5X	4.84 × 10⁻⁵	0	4.53 × 10⁻⁵	0
	1X	9.07 × 10⁻⁵	0	8.80 × 10⁻⁵	0
红茶样品(10%乙醇)	0.25X	8.61 × 10⁻⁵	2.25	5.60 × 10⁻⁵	2.25
	0.5X	1.77 × 10⁻⁴	0	1.16 × 10⁻⁴	0
	1X	3.40 × 10⁻⁴	2.25	2.40 × 10⁻⁴	2.25
绿茶样品(10%乙醇)	0.25X	3.27 × 10⁻⁵	0	2.23 × 10⁻⁵	2.25
	0.5X	6.89 × 10⁻⁵	0	4.53 × 10⁻⁵	0
	1X	1.33 × 10⁻⁴	2.25	9.18 × 10⁻⁵	0