Occurrence and volatility of several trace elements in pulverized coal boiler

The contents of eight trace elements(Mn, Cr, Pb, As, Se, Zn, Cd, Hg) in raw coal, bottom ash and fly ash were measured in a 220 t/h pulverized coal boiler. Factors affecting distribution of trace elements were investigated, including fly ash diameter, furnace temperature, oxygen content and trace elements‘ characters. One coefficient of Meij was also improved to more directly show element enrichment in combustion products. These elements may be classified into three groups according to their distribution: Group 1. Hg, which is very volatile. Group 2: Pb, Zn, Cd, which are partially volatile. Group 3: Mn, which is hardly volatile. Se may be located between groups 1 and 2. Cr has properties of both group ! and 3. In addition, the smaller diameter of fly ash, the more relative enrichment of trace elements (except Mn). The fly ash showed different adsorption mechanisms of trace elements and the volatilization of trace elements rises with furnace temperature. Relative enrichments of trace elements(except Mn and Cr) in fly ash are larger than that in bottom ash. Low oxygen content can not always improve the volatilization of trace elements. Pb is easier to form chloride than Cd during coal combustion. Trace elements should be classified in accordance with factors.     

Biogenic VOCs emission inventory development of temperate grassland vegetation in Xilin River basin, Inner Mongolia, China

Given the key role of biogenic volatile organic compounds(VOCs) to tropospheric chemistry and regional air quality, it is important to generate accurateVOCs emission inventories. However, only a less fraction of plant species, in temperate grassland of Inner Mongolia, has been characterized by quantitative measurements. A taxonomic methodology, which assigns VOCs measurements to unmeasured species, is an applicable and inexpensive alternation for extensive VOCs emission survey, although data are needed for additional plant families and genera to further validate the taxonomic approach in grassland vegetation. In this experiment, VOCs emission rates of 178 plant species were measured with a portable photoionization detector( PID). The results showed the most of genera and some families have consistent feature of their VOCs emission, especially for isoprene, and provide the basic premise of taxonomic methodology to develop VOCs emission inventories for temperate grassland. Then, the taxonomic methodology was introduced into assigning emission rate to other 96 species, which no measured emission rates available here. A systematical emission inventory of temperate grassland vegetation in Inner Mongolia was provided and further evidence that taxonomy relationship can serve as a useful guide for generalizing the emissions behavior of many, but not all, plant families and genera to grassland vegetation.     

突发性环境污染事故应急监测信息支持系统

丹东市突发性环境污染事故应急监测信息支持系统，是由危险源、危险物和地理信息等子系统组成。系统包含了危险源的数量、分布，危险物的种类、危险特性、监测方法、处置技术等信息，应用实践证明。该系统在污染事故的监测和处置过程中，具有很强的实用性。     

用现代计算机技术建立区域污染物总量控制信息管理系统

采用现代计算机技术与方法建立信息管理系统，对提高污染物总量控制等环境管理工作的效率非常有必要。章以广州经济技术开发区西区总量控制信息管理系统为例，介绍系统的的建立过程及主要功能。     

火电厂大气环境影响评价等级划分探讨

本以环境影响评价技术导则为基础，分析了实际工作中火电厂大气环境影响评价等级划分存在的问题，结合国家相关评价标准及污染物在大气中的转化规律，提出了正确划分火电厂大气环境影响评价等级的改进方法，为规范开展环评工作的范围和深度提供了依据。     

无线市话系统（小灵通）基站电磁辐射水平研究

本针对人们普遍关心的无线市话系统，俗称“小灵通”基站电磁辐射污染水平进行了系统研究，研究表明此类基站电磁辐射水平较低，对环境是安全的。     

利用钛白粉副产品硫酸亚铁生产高纯氧化铁的方法

硫酸法钛白粉副产品硫酸亚铁在较高温度下净化重结晶后，以碳酸氢铵做沉淀剂，生成碳酸亚铁经洗涤、干燥、焙烧得到高纯氧化铁。副产品硫酸氨可做液体氮肥、有机混肥氮肥添加剂；可与氯化钾作用生产硫酸钾和氯化铵。该技术综合经济效益较好，基本没有污染。     

工业区规划环评评价内容及评价指标体系的研究

本通过对《环境影响评价法》的学习，结合国内外对战略环境评价的研究经验，通过曹妃甸工业区规划环评工作实际对规划环评的评价内容及评价方法进行了探讨。     

重金属与土壤酶活性关系的探讨

本介绍了重金属对土壤酶的作用机理，近年来国内外土壤酶活性与重金属的研究进展，影响土壤酶活性与重金属关系的因素，土壤酶活性与重金属作用的研究方法，以及今后发展的展望。