“恒电流电解法测定铜含量”实验的改进

doi:10.3866/PKU.DXHX202007044

Abstract

Abstract:

Constant current electrolysis is an important content of instrumental analysis courses in high education. When this method was used to detect copper in solution, it was found that the neglected trace copper in the electrolytic residue caused the lower recovery of the copper sample. In response to this problem, the experiment was improved: the copper residue in electrolytic was detected with atomic absorption spectrometry and included in the total amount. The result from the constant current electrolysis was revised to improve the accuracy of the experimental result. The improved experiment is conducive to cultivating students' comprehensive ability of analysis and solving problem; at the same time, it provides an example for the reform of experiment teaching in instrumental analysis.

Key words: Constant current electrolysis, Atomic absorption spectroscopy, Copper, Experiment Improvement

Jing Chang, Chuang Shang, Wentao Zhao. Experimental Improvement of "Determination of Copper by Constant Current Electrolysis Method"[J].University Chemistry, 2021, 36(6): 2007044.

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References 15

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元素	波长/nm	灯电流/mA	光谱通带宽宽度/nm	燃气流量/(L∙min^-1)	燃烧器高度/mm
Cu	324.8	3.75	0.5	1.1	7

试样编号	CuSO₄的质量m_样/g	电解前阴极电极网质量m₁/g	电解后阴极电极网质量m₂/g	试样含铜量w_电解/%
样品1	1.8254	15.0318	15.4882	25.00
样品2	2.0889	14.8324	15.3547	25.00

样品编号	浓度c/(μg∙mL^-1)	吸光度
0	0.00	0.002
1	1.00	0.233
2	2.00	0.445
3	3.00	0.649
4	4.00	0.837

样品编号	吸光度	浓度c/(μg∙mL^-1)	浓度平均值${\bar c}$/(μg∙mL^-1)	相对标准偏差RSD/%	样品编号	吸光度	浓度c/(μg∙mL^-1)	浓度平均值${\bar c}$(μg∙mL^-1)	相对标准偏差RSD/%
样品	0.462	2.06	2.05	0.47	样品2	0.559	2.60	2.60	0.22
1	0.458	2.04				0.558	2.59
	0.458	2.05				0.558	2.60

样品编号	w_残留/%	w_电解/%	w/%
样品1	0.14	25.00	25.14
样品2	0.16	25.00	25.16

Experimental Improvement of "Determination of Copper by Constant Current Electrolysis Method"

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