邻二氮菲测铁的实验教学改进与实践

doi:10.3866/PKU.DXHX202107124

Abstract

Abstract:

According to the feedback of students and problems in laboratory course in recent years, the improvement of determination of iron with phenanthroline (Phen) is conducted. On the basis of the determination of total Fe with the standard curve, the determination of the molar absorption coefficient of complex compound (Phen-Fe³⁺, Phen-Fe²⁺), and the concentration of Fe²⁺ and Fe³⁺ of water samples are supplemented. The improvement of experimental content, can not only solve the doubt and enhance students' interests, but also guide students to actively think and cultivate their ability to solve practical problems.

Key words: Analytical chemistry experiment, Phenanthroline, Teaching improvement

Yue Zhang, Xiaoyan Wang, Suhua Gao. Improvement of Laboratory Teaching and Practice of Determination of Iron with Phenanthroline[J].University Chemistry, 2022, 37(6): 2107124.

λ/nm	A	ε/(L·mol^?1·cm^?1)	λ/nm	A	ε/(L·mol^?1·cm^?1)
440	0.244	6832	510	0.342	9576
450	0.262	7336	515	0.342	9576
460	0.285	7980	520	0.322	9016
470	0.310	8680	525	0.318	8904
480	0.326	9128	530	0.290	8120
490	0.329	9212	540	0.218	6104
500	0.338	9464	550	0.101	2828
505	0.342	9576	560	0.055	1540

λ/nm	A	ε/(L·mol^?1·cm^?1)	λ/nm	A	ε/(L·mol^?1·cm^?1)
440	0.018	504	510	0.003	84
450	0.013	364	515	0.003	84
460	0.009	252	520	0.002	56
470	0.007	196	525	0.001	28
480	0.005	140	530	0	0
490	0.004	112	540	0	0
500	0.003	84	550	0	0
505	0.003	84	560	0	0

编号	V/mL	c(Fe)/(mg?mL^?1)	A
标1	2	0.0004	0.072
标2	4	0.0008	0.152
标3	6	0.0012	0.232
标4	8	0.0016	0.307
标5	10	0.002	0.398
c (Fe)	1	0.0017	0.342
c (Fe²⁺)	1	0.0012	0.238

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Improvement of Laboratory Teaching and Practice of Determination of Iron with Phenanthroline

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