“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.

Figures/Tables 6

References 15

1	唐向阳; 余莉萍; 朱莉娜; 高洪苓; 陶敏莉. 基础化学实验教程, 第4版北京: 科学出版社, 2015.
2	吕茜茜; 张钊; 王晋平. 冶金分析, 2017, 37 (5), 30.
3	肖文康. 科学技术创新, 2019, (25), 37.
4	白玲娟. 能源与节能, 2013, (10), 108. doi: 10.3969/j.issn.2095-0802.2013.10.044
5	孙书静. 福建分析测试, 2016, 25 (5), 50. doi: 10.3969/j.issn.1009-8143.2016.05.10
6	高学峰; 张立婷; 郭莹. 电镀与环保, 2003, 23 (4), 28. doi: 10.3969/j.issn.1000-4742.2003.04.012
7	王力; 李建舫; 胡文骏; 乌云. 兵器材料科学与工程, 2007, 30 (2), 67. doi: 10.3969/j.issn.1004-244X.2007.02.018
8	薛明浩; 王俊秀; 李龙霞; 张小燕; 魏新晖. 山东冶金, 2015, 37 (1), 38. doi: 10.3969/j.issn.1004-4620.2015.01.022
9	宋楠; 李鲜红. 科技创新导报, 2018, (22), 238.
10	张起凯; 刘立行; 李海彪. 实验室研究与探索, 2005, 24 (8), 21. doi: 10.3969/j.issn.1006-7167.2005.08.008
11	王健; 曾蠡; 吴同; 孙涛. 实验技术与管理, 2005, 22 (8), 30. doi: 10.3969/j.issn.1002-4956.2005.08.008
12	冯雪松; 吴卫兵. 实验技术与管理, 2016, 33 (11), 213.
13	邓佑林; 陆婷婷; 黄秀香; 韦岩松; 张鹏; 黄正力; 龚学文; 黄洪霞. 化工技术与开发, 2019, 48 (9), 39.
14	刘志勇; 朱根华; 顿珠次仁; 熊耀坤; 黄秀珍; 严志宏. 实验室研究与探索, 2016, 35 (8), 44.
15	张进. 陕西水利, 2019, (11), 54.

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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