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.     

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.     

锅炉烟气脱硫技术发展综述

在调查研究的基础上，论述国内外烟道气脱硫技术的发展与前景，提出开发生产适合我国国情的烟气脱硫技术势在必行。还简要介绍了最为普遍的石灰／石灰石法脱硫基本原理。     

膜分离技术用于非电解质除杂

介绍电渗析装置工艺及基本原理，提出使用离子选择性透过膜的依据及极限电流的确定方法．论述了不同方法对冷冻液与ＮａＳＣＮ分离效果影响，指出采用电渗析法分离冷冻液中的ＮａＳＣＮ，使除杂率可达９５％以上。本工艺为腈纶冷冻液除杂及防治污染提供了新途径。     

环烷酸脱油工艺的实验研究

以锦州化工二厂生产的２＃环烷酸为原料，采用减压蒸馏──初馏分皂化萃取脱油工艺，可制得中性油含量分别低于１０％和５％的一级品环烷酸．该工艺具有流程简单、物料消耗少、产品收率高等优点．通过实验，初步探讨了蒸馏真空度、氢氧化钠浓度及用量、乙醇用量、萃取剂用量等工艺条件对脱油效果及产品质量的影响。     

大运河常州段水质变化及其影响因素

根据目前已建立的基本水质数据库，对大运河常州段的水质现状和趋势作了分析。利用质量平衡，建立了污染物量和水质之间的直观关系，发展了繁忙的机动船只动输运河产生油污染的同时，会对水体中溶解氧产生有的贡献。     

无汞电池浸出液对种子萌发与植物生长影响的初步探索

很多人认为无汞电池是"绿色电池",对环境的危害小,而且我国的电池回收利用技术尚不成熟,回收处理代价较大.所以各级政府和相关部门对回收处理废旧电池积极性较低.为论证无汞废旧电池浸出液对植物早期生长的影响,通过对比较典型的黄豆、玉米和大白菜在无汞电池环境下种子萌发率及幼苗早期生长形态、平均株高和平均增高的观察统计.结果表明:无汞电池浸出液对植物早期生长有着很大的影响.建议政府环保部门在近期出台相关政策文件,动员和号召各级政府和相关部门做好废旧电池的回收工作,积极引进、开发废旧电池处理先进工艺和技术.