化学自主设计实验的探索与实践——以TiCN基合金中N含量测定为例

doi:10.3866/PKU.DXHX202306024

Abstract

Abstract:

Different from the basic chemistry experiment course in the lower grades of the university, the higher grades offer self-designed experiments, focusing on independent thinking and active exploration. Taking the "determination of N content in TiCN-based alloys" as an example, this paper introduces the whole process of self-designed experiments, including the digestion of solid samples, the extraction of substances to be measured, analysis and testing, data processing and evaluation, and introduces theoretical knowledge into practical problems, and uses experimental methods to deeply integrate the two, improving students' ability to judge, solve problems and comprehensive quality.

Key words: Self-designed, TiCN- based alloys, Nitrogen content, Chemical experiment

Ying He, Qing Li. Exploration and Practice of Self-Design Experiments in Chemical Experiment: Determination of Nitrogen Content in TiCN-Based Alloys[J].University Chemistry, 2024, 39(1): 185-190.

Figures/Tables 5

References 10

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熔剂种类	现象	15 min后内容物状态	反应趋于平静所需时间/min
H₂SO₄ + K₂SO₄	白烟	液体，少许不溶颗粒	60
K₂S₂O₇	白烟	液体，少许不溶颗粒	40
H₂SO₄ + H₂O₂ + K₂S₂O₇	大量白烟	液体	30
H₂SO₄ + K₂SO₄ + K₂S₂O₇	大量白烟	液体	10

序号	A 碱液的用量/mL	B 蒸馏时间/min	C 馏出液体积/mL	D 吸收液用量/mL	氮量平均值/mg
1	40	6	50	20	19.23
2	40	8	70	30	19.57
3	40	10	90	40	19.89
4	60	6	70	40	19.84
5	60	8	90	20	19.98
6	60	10	50	30	20.02
7	80	6	90	30	19.87
8	80	8	50	40	20.03
9	80	10	70	20	20.01
k₁	58.69	58.94	59.28	59.22	–
k₂	59.84	59.58	59.42	59.60	–
k₃	59.91	59.92	59.74	59.76	–
R	1.22	0.98	0.46	0.54	–

试样质量/mg	消耗硫酸标液体积/mL	氮含量w_(N)/%	氮含量平均值/%	RSD/%
0.1105	19.84	14.55	14.59	0.49
0.1136	20.53	14.65
0.1078	19.50	14.66
0.1139	20.36	14.49
0.1091	19.64	14.59

TiCN质量/mg	氮含量/mg	(NH₄)₂SO₄加入量/g	N标准加入量/mg	测定N/mg	回收率/%
0.1001	14.60	0.0532	11.28	25.76	98.94
0.1028	15.00	0.0836	17.72	32.58	99.21
0.1035	15.10	0.0925	19.61	34.23	97.55
0.1013	14.78	0.1125	23.85	38.01	97.40
0.1025	14.95	0.1367	28.98	43.13	97.23

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Exploration and Practice of Self-Design Experiments in Chemical Experiment: Determination of Nitrogen Content in TiCN-Based Alloys

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