Preliminary study on organic contaminants in the water of northwest part of the Lake Chao

The waterquality of the downstream of Nanfei River and the northwest area of Lake Chao is evaluated from organic analysis aspect. PAHs such as fluoranthene, pyrene are detected in the waters collected from downstream river and river mouth. More phenolic compounds are found in the river water. Some halogenated hydrocarbons are present in the river and lake waters. A great many of aliphatic hydrocarbons and benzene hydrocarbons found in all the water samples are about one third of the total organics detected. The hydrophobic components are found to be present not only in water but also in suspended sediment. The ratio of the amount existing is 0.4 in sediment and 1 in particle-free water. The quantity of humic materials existing in lake water is larger than that in river water. The proportion of the humic materials in lake water to that in river water is 1.9 to 1. In the lake water, some natural substances, such as dimethyl disulfide, alpha-pinene, azulene, and 6- methyl -2-heptanone are observed.     

The study for polyaromatic hydrocarbons decay on Chinese coal soot particles in atmosphere

A study for the photochemical behavior of some polyaromatic hydrocarbons (PAH), for example B(a )P, B( k )F and fluoranthene in coal smoke particles was performed by using indoor Teflon smog chamber.Experiments suggest that the photochemical reaction of PAH is first order reaction and kinetic rates of some PAH were obtained. It was shown that the reaction rate constant is proportional to light intensity and water vapor concentration. Temperature and PAH loading also have influence on PAH decay rate. A model for PAH loss has been set up on the basis of the results of our experiments and the simulating results of this model suggest that coal particle PAH half lives are of the order of a period of days in winter and a few hours in summer. Other factors which may have effect on the photochemical reaction of PAH have also been discussed.     

The hierarchy and spatial characteristics of ecosystems: A reconsideration of the ecosystem concept (II)

This paper, based on the autonomy concept, continues to investigate hierarchical forms and spatial structure of ecosystems. The former can lead to limits for the selection of the component parts of an ecosystem and a distinction between its endogenous and exogenous variables; and the latter can be lead to a hypothesis of the space of an ecosystem: the space of an ecosystem = its habitat area + supporting area + impact area, and two characteristics of ecosystems, space-overlapping and the area of ecosystem space, have been further studied referring to human activities.     

共生细菌SB1降解聚乙烯醇的研究Ⅱ．共生细菌SB1聚乙烯醇氧化酶的产生、纯

共生细菌ＳＢ１接种在０．３％聚乙烯醇培养堪中，３０℃摇床振荡培养或发酵罐通气培养时，ＰＶＡ氧化酶产生的高峰在４８ｈ或４０ｈ。离心收集的上清液采用４０％－５０％饱和度的硫酸铵分级沉淀ＤＥＡＤ－Ｓｅｐｈａｄｅｘ离子交换柱和Ｃｉｂａｃｒｏｎ蓝Ｓ－Ｓｅｐｈａｒｏｓｅ４Ｂ亲和柱层析等纯化步骤。ＰＶＡ氧化酶收得率３０％，比活力提高３０倍。     

硫精砂尾矿还原硫酸烧渣的研究

利用硫精砂尾矿还原硫酸烧渣，从而提高烧渣中的铁的浸出率，达到综合利用尾矿及烧渣，减轻污染的目的。结果表明，把烧渣和尾矿按４－６比１的比例混合，在７００－８００℃处理３０ｍｉｎ，铁的浸出率比处理前增加３倍。文中还讨论了还原机理。     

Preconcentration and determination of trace copper(II) in natural water using silica gel modified with 1-(2-pyridylazo)-2-naphthol

Trace copper (II) in water can be preconcentrated using silica gel modified with 1-(2-pyridylazo)-2-naphthol (PAN) and be determined spectrophotometri-cally. The conditions for the preconcentration were studied. The method was applied to both artificial and natural water samples and the results suggest that copper (II) of ppb level in water can be measured accurately after the preconcentration.     

火电厂浮升烟流穿透模型分析

通过对现有浮升烟流穿透模型的分析,考虑了非均匀层结大气对烟流抬升的影响,提出了一个较为合理的穿透模型,区域性火电厂实例计算结果表明它是有效的.因此,该模型为大型火电厂环境影响评价提供了一种估算浮升烟流穿透过程的实用方法.