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Development of analytical method of heavy metal ions utilizing natural pigments and its application in environmental education

天然色素重金属离子分析方法的开发及其在环境教育中的应用

基本信息

批准号：
12680180
负责人：
SHIRANE fukue
金额：
$ 2.3万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

Through the present research project, the following can be revealed concerning the development of teaching material of chemistry experiment utilizing various natural pigments including in plants.(1) Natural pigments, such as Brazilin, Indigo, Aloe-emodin, Quercetin, can easily be extracted with simple procedures within limited time from natural plants. The procedure of extracting such natural pigments can be applied for the school chemistry in Junior high school and high school.(2) The extracted solutions of Brazilin, Aloe-emodin, Quercetin indicate beautiful color by reacting with solutions including various heavy metal ions. These reactions of natural pigments with heavy metal ions can be utilized for identifying qualitatively the kind of heavy metal ions and applied to various related sections of school chemistry.(3) Test papers for identifying heavy metal ions can easily by prepared using the extracted natural pigments. Some of them can also be utilized quasi-quantitative analysis of heavy metal ions. The test paper is useful in chemistry course concerning the environmental education in schools.(4) The natural pigments indicate beautiful color changes during acid base reactions and redox reactions in addition to complex formation reaction with heavy metals. These reactions can effectively utilized for introducing these types of reactions.(5) Chemistry experiments using the natural pigments are effective in stimulating students' interest for nature and chemistry because of the beautiful color reactions. By combining the experiments on chemical synthesis of these natural pigments, it is also enable the students to discuss about the history and significance of chemistry.

通过本研究项目，可以揭示以下关于利用植物中的各种天然色素开发化学实验教材的信息：(1)天然色素，如巴西素、靛蓝、芦荟大黄素、槲皮素，可以在有限的时间内通过简单的程序轻松地从天然植物中提取。这种天然色素的提取方法可以应用于初中和高中的学校化学。(2)巴西素、芦荟大黄素、槲皮素的提取溶液通过与含有多种重金属离子的溶液反应而呈现出美丽的颜色。天然色素与重金属离子的这些反应可用于定性鉴定重金属离子的种类，并应用于学校化学的各个相关部分。(3)利用提取的天然色素可以方便地制备鉴定重金属离子的试纸。其中一些还可以用于重金属离子的准定量分析。该试卷适用于学校环境教育化学课程。(4)天然色素除了与重金属形成络合物反应外，在酸碱反应和氧化还原反应中表现出美丽的颜色变化。这些反应可以有效地用于介绍这些类型的反应。(5)使用天然色素进行化学实验，由于美丽的颜色反应，可以有效激发学生对自然和化学的兴趣。结合这些天然色素的化学合成实验，也能让学生讨论化学的历史和意义。