“自主设计实验”教学模式在仪器分析实验中的应用——ICP-OES检测茶水中的金属含量

doi:10.3866/PKU.DXHX202301036

Abstract

Abstract:

Instrument analysis experiment is an important practical course. It's the basis for cultivating students' innovative awareness and improving students' comprehensive quality. "Self-designed experiment" adheres to the principal position of students, guides students to consult literature and formulate experimental plans by themselves. It effectively integrates the key points of knowledge into the experimental process under the assistance and guidance of teachers, so as to deepen the theoretical learning and the practical application. In this experiment, inductively coupled plasma optical emission spectrometry (ICP-OES) was used to determine the content of metal elements in different kinds of tea. The influence of soaking time and the number of soaking on the dissolution of metal elements was investigated to identify whether it met the requirements of national standards, and the existing literature data were compared to supplement and improve. It provides the theoretical basis and guidance for people to choose the way of brewing tea. "Self-designed experiment" closely links chemistry with daily life, stimulates students' learning enthusiasm and exploration spirit, aims to strengthen students' experimental operation ability and autonomous learning ability, and enhance students' innovative awareness and practical spirit.

Key words: Instrumental analysis experiment, Teaching reform, Self-designed experiments, Inductively coupled plasma optical emission spectrometry, Tea, Metal elements

Minli Gao, Borui He, Jiaxin Dong, Chengying Fei, Shufan Fu, Jiaxin Ding, Siyi Gu, Hanyang Li, Jiayuan Li, Zuwang Ding, Jingkang Ding, Xingrui Heng, Fei Ding, Langxing Chen, Yizhou Zhu, Jing Wang. The Application of "Self-Designed Experiment" Teaching Mode in the Instrumental Analysis Experiment: Determination of Metal Elements in Tea by ICP-OES[J].University Chemistry, 2023, 38(10): 235-242.

Figures/Tables 10

References 19

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元素	标准曲线浓度/(µg∙mL⁻¹)	线性回归方程	相关系数
Cd	0、0.10、1.00、10.00	y = 2155.8x + 4.4731	0.99994
Cr	0、0.10、1.00、10.00	y = 4271.6x + 6.0331	0.99997
Cu	0、0.10、1.00、10.00	y = 661.71x − 0.25668	0.99997
Fe	0、0.10、1.00、10.00	y = 2125.9x + 0.27291	0.99975
Mn	0、0.10、1.00、10.00	y = 20497x − 1.4854	0.99993
Ni	0、0.10、1.00、10.00	y = 807.93x + 2.8516	0.99998
Pb	0、0.10、1.00、10.00	y = 32.454x + 1.9616	0.99994
Sn	0、0.10、1.00、10.00	y = 491.44x − 3.7556	0.99912
Zn	0、0.10、1.00、10.00	y = 833.14x + 1.1915	0.99966
Ca	0、1.00、10.00、100.00	y = 475.14x + 1.5861	0.99993
Mg	0、1.00、10.00、100.00	y = 225.02x − 0.46450	0.99914
Na	0、1.00、10.00、100.00	y = 1078.2x + 507.73	0.99972

元素	实验LOD/(µg∙mL⁻¹)	文献LOD/(µg∙mL⁻¹)
Cd	0.0006	0.0010
Cr	0.0021	0.0060
Cu	0.0036	0.0150
Fe	0.0036	0.0014
Mn	0.0009	0.0078
Ni	0.0045	0.0042
Pb	0.0066	0.0070
Sn	0.0237	0.2000
Zn	0.0012	0.0018
Ca	0.0093	0.0150
Mg	0.0201	0.0150
Na	0.0276	0.0340

元素	龙井	毛峰	富硒茶	子竹茶	肉桂茶	铁观音	金骏眉
Cd	–	–	–	–	–	–	–
Cr	0.0043	0.0035	0.0046	0.0035	–	–	0.0052
Cu	0.0224	0.0921	0.0416	0.0445	0.0255	0.0097	0.1084
Fe	0.0039	0.0141	0.0104	0.0164	0.0872	0.0165	0.0388
Mn	13.24	5.228	6.603	7.138	1.345	1.312	6.529
Ni	0.1503	0.2703	0.1644	0.3937	0.0398	0.0282	0.0386
Pb	–	–	0.0074	0.0099	–	–	0.0080
Sn	–	–	–	–	–	–	–
Zn	0.6367	0.8161	0.6625	0.6797	0.2370	0.0968	0.5414
Ca	4.474	3.565	3.773	4.213	4.066	3.171	2.502
Mg	28.11	41.95	33.09	31.68	13.43	7.244	24.69
Na	1.164	0.9480	0.9050	1.443	0.5490	0.2540	17.33

元素	龙井	毛峰	富硒茶	子竹茶	肉桂茶	铁观音	金骏眉
Fe	121.1	1.945	150.88	106.6	192.34	3.410	111.427
Cu	10.98	10.42	12.68	2.01	9.40	6.69	16.204
Mn	767.4	190	311.57	118.87	762.05	363	655.64
Ni	8.27	3.0815	10.08	–	3.69	1.26	1.527
Zn	43.21	40	103.84	45.93	54.07	9.5	24.736
Cd	0.03	0.007	0.144	–	–	0.0025	0.049
Pb	2.072	0.212	0.375	–	–	0.115	0.861

元素	1 min	3 min	5 min	10 min	30 min	50 min	元素	1 min	3 min	5 min	10 min	30 min	50 min
Cd	–	–	–	–	0.0022	0.0013	Pb	–	–	–	–	–	–
Cr	–	–	–	–	0.0074	0.0062	Sn	–	–	–	–	–	–
Cu	0.0152	0.0171	0.0202	0.0320	0.0387	0.0428	Zn	0.0794	0.1182	0.1459	0.1833	0.4563	0.4547
Fe	–	0.2016	0.0313	0.0410	0.1197	0.0639	Ca	2.870	3.094	4.630	5.283	13.02	15.32
Mn	0.2723	0.8333	1.125	2.407	12.87	12.71	Mg	1.994	5.880	8.128	13.59	55.50	61.70
Ni	0.0107	0.0228	0.0283	0.0366	0.1556	0.1364	Na	1.291	2.951	1.494	2.265	2.634	4.743

The Application of "Self-Designed Experiment" Teaching Mode in the Instrumental Analysis Experiment: Determination of Metal Elements in Tea by ICP-OES

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元素	第一次浸泡液	第二次浸泡液	第三次浸泡液
Cd	–	–	–
Cr	–	–	–
Cu	0.0892	0.0553	0.0285
Fe	0.0191	0.0055	–
Mn	3.645	0.8591	0.2503
Ni	0.1863	0.0477	0.0115
Pb	–	–	–
Sn	–	–	–
Zn	0.6403	0.1974	0.0634
Ca	2.182	0.5610	0.1610
Mg	31.56	8.478	2.300
Na	0.6300	0.1170	0.0490

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