湘江沉积物镉和汞质量基准的建立及其应用

沉积物质量基准是保护底栖生物免受污染物危害的保护性临界水平,可用来评估与沉积物结合的污染物的影响,并为底栖生物保护和沉积物的科学管理提供依据.分析了湘江43个采样点沉积物、上覆水、间隙水和植物中Cd和Hg含量,选取钩虾做沉积物毒理实验,利用相平衡分配法、加标毒理实验法和背景值法确定湘江沉积物Cd和Hg质量基准低值(SQC-L)分别为1.89 mg·kg-1和0.13 mg·kg-1,基准高值(SQC-H)分别为28.32 mg·kg-1和0.79 mg·kg-1.经与国内外基准值比较,并与底栖生物监测数据和植物监测数据对比分析,表明确定的基准值合理.应用该基准值评价湘江沉积物质量现状发现,湘江沉积物Cd和Hg含量低于SQC-L和高于SQC-H的采样点所占比例较低,74.4%和76.7%的采样点沉积物Cd和Hg含量在SQC-L和SQC-H之间.     

Water extraction kinetics of metals, arsenic and dissolved organic carbon from industrial contaminated poplar leaves

In industrial areas, tree leaves contaminated by metals and metalloids could constitute a secondary source of pollutants. In the present study, water extraction kinetics of inorganic elements （IE： Pb, Zn, Cd, As, Fe and Mn）, dissolved organic carbon, pH and biological activity were studied for industrial contaminated poplar leaves. Moreover, the distribution of the IE through the size fractions of the associated top soil was measured. High quantities ofMn, Zn and As and polysaccharides were released in the solution from the strongly contaminated leaves. The kinetic of release varied with time and metal type. The solution pH decreased while dissolved organic contents increased with time after 30 days. Therefore, these contaminated leaves could constitute a source of more available organic metals and metalloids than the initial inorganic process particles. However, the distribution of the IE through the size fractions of the top soil suggested that a great part of the released IE was adsorbed, reducing in consequence their transfers and bioavailability. It＇s concluded that mobility/boioavailability and speciation of metals and metalloids released from the decomposition of polluted tree leaves depends on soil characteristics, pollutant type and litter composition, with consequences for environmental risk assessment.     

电动单梁起重机吊运熔化金属浅议

目前，电动单梁起重机大量应用在小型铸铁、铸钢等金属冶炼企业，由于其设计的局限性，存在明显的隐患，大大降低了使用寿命，也为检验和判定带来了困难。按道理讲，全部换成冶金起重机是比较安全的，也达到了《起重机械监督检验规程》（以下简称《检规》）的要求，但实际上，无论从地方经济还是企业成本来看都是不现实的。     

关于对内蒙古包头金属深加工园区的现状分析及几点建议

本文就内蒙古包头金属深加工园区基本概况及现状从土地利用、人口、项目、发展规划等方面进行了分别阐述和综合分析,并对园区的下一步建设和管理提出几点合理化建议.     

常熟市锻压机床有限公司

简介 常熟市锻压机床有限公司位于长江三角经济发达地区，京剧《沙家浜》的故事就发生在这里，是真正的江南鱼米之乡。本公司是全国金属回收加工机械重点生产企业，定点生产企业，本公司主要产品：金属回收国工机械和冶金矿山机械两大类，及其零配件生产，竭诚欢迎客户来人来函订购洽谈。     

绿色冶金在环境保护中的重要作用

钢铁工业作为国家的重要工业部门,是发展国防建设的物质基础。冶金工业的发展水平也是衡量一个国家工业化进程的标志之一。绿色冶金的大力推广和发展是为了实现资源的高效利用和循环经济发展,炼钢厂以"减量化、再利用、资源化"作为生产准则,对产生的余热、余压、余气、废水、含铁物质以及固体废弃物进行充分的循环再利用,基本实现了零排放。促使钢厂能够具有钢铁生产、能源转换、城市固废消纳等多种功能,最终成为服务社会、节约资源的绿色工厂。逐步取代以往工厂的高消耗、高污染生产模式,促进绿色冶金的快速发展。