Plant nutrients Plant growth requires various nutrients Major nutrient elements: C,N, P trace elements: S, Si, Cl, I, and metallic elements(Fe, Mn, Cu, etc) The minor elements because of the low demand can Water y be supplied at adequate rates in natural

Good Ozone and Bad Ozone Stratospheric ozone protect lives on Earth from harmful effects of UV radiation. .Iropospheric ozone: Causing respiratory distress and eye irritation Destroying plants Producing cracks in rubber Ozone is a strong oxidant, reacts with molecules containing C=C double bonds, forming epoxides

pH of a buffer and buffer capacity Example: For a buffer solution consisting of 0. 1 M acetic acid and o1M sodium acetate the ph of the solution is 4.75 HAc= i If an amount of hydrochloric acid equivalent to 10% of the acetate present, is added to the buffer, what is the new pH of the solution?

Water vapor in the air The volume of Water vapor is variable, depending on temperature, precipitation, rate of evaporation and other factors at a particular location The percentage of water vapor ranges from 0.1- 5%. Generally it is 1-3%(the 3rd most abundant constituents in the air)

The atmosphere The atmosphere is a thin blanket of gas that envelops the earth The gases that make up the atmosphere are held close to the earth by the pull of gravity With increasing distance from the earth's surface, the temperature, density, and composition of the atmosphere gradually change

描述性动物毒性实验是指通过对环境有害因素特别是外源化学物的毒理学 基础研究,包括一定程序的实验动物选择、实验模型的制作、数量与剂量确 定、染毒方法及毒性指标等,观察动物机体所产生的总体毒性效应,通过不断 反复的资料积累作出毒理学评价并外推至人类,为防治暴露于环境有害因素的 有害作用提出综合性措施的过程

中华人民共和国国家经济贸易委员会令 第35号 《危险化学品登记管理办法》已经国家经济贸易委员会主任办公会议审议通过,现予公 布,自2002年11月15日起施行

环境污染概况。资源综合利用。清洁生产。可持续发展 大气污染及其防治。大气主要污染物(烟尘、SO2、No、CO、HC等)综 合性大气污染现象(酸雨,温室效应,臭氧层的破坏,光化学烟雾)。大气 污染的防治

1、了解土壤化学分析工作的意义。 2、掌握土壤化学分析的误差来源。 3、了解土壤化学分析的误差检验与减免方法。 4、熟悉土壤化学分析的步骤

随着化学氮肥用量的增加,导致了严重的环境污染,迫切需要增加生物固氮来保证粮食生产和减少环境污染。为发挥稻田生物固氮功能,我们对稻田生物固氮的研究方法、固氮量、固氮微生物、影响因素、调控及其研究方向进行综述,以期为稻田生物固氮研究提供参考