Teaching Materials for Environmental Education -Approach to environmental surroundings with the guidance of nitrogen-compounds-

作为环境教育的教材之一，环境污染物的简易测定方法的发展和自然界中几种有趣的澄清能力已被广泛研究并应用于义务教育的教学中。研究发现，燃烧各种纸、衣服和塑料制品等生活必需品产生的烟雾很容易产生酸雨，除了丝绸的塑料燃烧产生的灰烬对植物生长有负面影响，在土壤中很难生物降解。将改进的二氧化氮测定方法应用于熊本县大气污染状况的测定。结果表明，大气中二氧化氮的含量受天气（风雨）、地面形态和建筑物的影响较大。“Igusa（materials for matting）”对去除二氧化氮非常有用。研究发现木炭和活性炭对河流中共存的化学物质如铵和硝酸根离子有很强的吸附能力。浮萍的生长受到生活废水的酸度和表面活性剂的显著影响。将浮萍的这些特性应用于实际环境水体、河流、池塘等的污染评价中，证实了土壤中铵离子在硝化细菌的作用下转化为硝酸根离子，最后发现大自然想出了许多巧妙的花招，这些结果对义务教育阶段的环境教育有很大的参考价值。

As one of the teaching materials for environmental education, both developments of simple determination methods for environmental pollution matters and several kinds of interesting clarification powers in nature have been widely investigated and applied to teachings in compulsory education.It was found that an acid rain can be easily made from smoke produced by buring any given daily necessaries such as kinds of paper, clothes and plastic goods, except for silk ones. The ashes obtained by combustion of plastic are affected negative interferences for a plant growth and are very difficult to biodegrade in soil.The improved determination method for nitrogen dioxide was applied to the measurement of the air pollution condition in Kumamoto Prefecture. It was found that the amounts of nitrogen dioxide are remarkable influenced by weather (wind and rain), configuration of the ground and building. "Igusa (materials for matting)" is very useful to remove the nitrogen dioxide.It was found that charcoal and activated carbon are great adsorptive capability for co-existing chemical species in river such as ammonium and nitrate ion. Lemna growth is notably affected by acidity and surface-active agents of domestic waste water. These characteristics of lemna have been applied to the estimation for the pollution of actual environmental water; rivers, ponds and so on. It was confirmed that ammonium ion is transformed into nitrate ion by the action of nitrifying bacteria in soil.Finally, it was found that the nature has been thought of many clever tricks, and these results obtained support to great valuable for Environmental Education in compulsory education.