Uncertainty Evaluation and Method Improvement of Determination of Copper, Lead, and Zinc in Rocks by Atomic Absorption Spectrometry

Ya-ru HOU; Ji-long LU; Yu-chao FAN; [in Chinese]; Xiao-dan TANG; Qiao-qiao WEI; Jin-ke GUO; Wei ZHAO

doi:10.3964/j.issn.1000-0593(2022)07-2101-06

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 7 >Page 2101 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 7, 2101 (2022)

Uncertainty Evaluation and Method Improvement of Determination of Copper, Lead, and Zinc in Rocks by Atomic Absorption Spectrometry

Ya-ru HOU^*, Ji-long LU^*;, Yu-chao FAN, [in Chinese], Xiao-dan TANG, Qiao-qiao WEI, Jin-ke GUO, and Wei ZHAO

Author Affiliations

College of Geoexploration Science and Technology, Jilin University, Changchun 130026, China

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DOI: 10.3964/j.issn.1000-0593(2022)07-2101-06 Cite this Article

Ya-ru HOU, Ji-long LU, Yu-chao FAN, [in Chinese], Xiao-dan TANG, Qiao-qiao WEI, Jin-ke GUO, Wei ZHAO. Uncertainty Evaluation and Method Improvement of Determination of Copper, Lead, and Zinc in Rocks by Atomic Absorption Spectrometry[J]. Spectroscopy and Spectral Analysis, 2022, 42(7): 2101 Copy Citation Text

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Fig. 1. Fishbone diagram depicting sources of uncertainty

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Fig. 2. Relative uncertainty of copper, lead, and zinc in core sample

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元素	Cu	Pb	Zn
波长/nm	324.7	283.3	213.9
光谱带宽/nm	0.4	0.4	0.4
灯电流/mA	3.0	2.0	3.0
滤波系数	0.6	0.6	1.0
积分时间/s	3.0	3.0	3.0
燃烧器高度/mm	5.0	6.0	6.0
火焰类型	Air-C₂H₂	Air-C₂H₂	Air-C₂H₂

Table 1. Instrument operating parameters

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测定元素	测定值/(μg·mL^-1)				标准偏差	检出限/ (μg·mL^-1)
	0.022	0.014	0.014	0.014
Cu	0.006	0.022	0.022	0.014	0.005	0.016
	0.022	0.022	0.022	0.014
	0.147	0.147	0.082	0.147
Pb	0.082	0.147	0.147	0.082	0.032	0.096
	0.082	0.147	0.147	0.147
	0.004	0.006	0.004	0.004
Zn	0.004	0.006	0.004	0.006	0.001	0.003
	0.006	0.004	0.006	0.004

Table 2. Measurement results of the blank samples and detection limits

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参数	铜	铅	锌
均值/(μg·g^-1)	3.263	30.683	28.046
推荐值/(μg·g^-1)	3.200	31.000	28.000
相对误差/%	1.969	-1.023	0.164
相对误差允许限/%	21.21	15.66	15.93
相对偏差允许限/%	30.00	22.15	22.53

Table 3. Measurement results of standard samples

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	铜		铅		锌
	标准浓度/ (μg·mL^-1)	平均吸光度	标准浓度/ (μg·mL^-1)	平均吸光度	标准浓度/ (μg·mL^-1)	平均吸光度
1	0.00	0.001	0.0	0.000	0.0	0.004
2	0.10	0.013	0.5	0.007	0.4	0.150
3	0.20	0.025	1.0	0.015	0.8	0.295
4	0.30	0.038	1.5	0.023	1.2	0.427
5	0.40	0.051	2.0	0.030	1.6	0.561
6	0.50	0.065	2.5	0.038	2.0	0.690
${\overset{̅}{c}}_{0}$ /(μg·mL^-1)	0.25		1.25		1.00
标准曲线	A=0.127 7c+0.000 2		A=0.015 3c-0.000 2		A=0.342 5c+0.012
相关系数	0.999 6		0.999 8		0.999 7
岩心样品均值/(μg·mL^-1)	0.198 6		1.456 6		1.232 7
标准样品均值/(μg·mL^-1)	0.130 5		1.227 3		1.121 8
s	0.000 4		0.000 2		0.003 6

Table 4. Calculation results and relevant parameters of standard curve and samples

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