The ecosystem and autonomy: A reconsideration of the ecosystem concept (I)

A critical review of the development of the ecosystem concept is presented in this paper. An attempt to define the concept is discussed in details with reference to autonomy.     

光助电催化降解偶氮染料酸性橙II的降解过程研究

使用自制的具有电催化活性和光催化活性TiO2改性的β-PbO2电极,研究了光助电催化氧化过程、电催化氧化过程和光催化氧化过程对于偶氮染料酸性橙II的降解.用紫外可见光谱和高效液相色谱分析了3种降解过程中不同的降解行为,对降解产物进行了FTIR和GC-MS分析.结果表明,单独电催化过程不同于其它2种过程,出现了醌类物质的大量累积;而在光助电催化氧化过程中,光催化氧化过程大大抑制了电催化氧化过程中累积的高毒性醌类物质.在2h内,光助电催化氧化过程是其它2种过程TOC去除率的1.56倍,产生了明显的协同作用.3种降解过程遵循相同的降解历程,都经历了产生醌类物质到低分子量有机酸的步骤.     

环境与发展

本文论述了环境与发展的关系,并简要介绍了可持续发展的基本理论,在此基础上阐述了在中国如何实施可持续发展战略。     

《斯德哥尔摩公约》的实施进展及相关国际活动研究

本文总结了《斯德哥尔摩公约》签署2年多来,国际社会和世界主要国家为公约的最后生效实施所做努力及公约的执行进展。分析了各国针对履行POPs公约、控制POPs污染影响所采取的国家行动计划及其主要特点。这些相关信息可为我国制定履行POPs公约的国家实施计划(NIP)及相关的策略选择提供依据和参考。     

地震火灾事例调查

本文介绍了世界上典型的几个地震火灾的例子,汇总了中外地震史上曾发生过的地震火灾,并且较详细地介绍了产生地震火灾的原因。     

中国环境监测总站未来十年发展构想

阐述了总站未来十年发展的指导思想、目标和原则,明确了总站未来十年发展的重点业务领域,介绍了实现构想的保证措施和重点建设项目。     

Synthesis, separation and identification of dinitropyrene isomers

Dinitropyrenes (DNP) were prepared by nitration of pyrene, and the product was characterized by MS and elemental analysis. Three isomers of DNP were separated by HPLC and identified by 1H-NMR. The eating sequence on the normal phase column is 1, 3-DNP, 1, 6-DNP and 1, 8-DNP, whereas is 1, 6-DNP, 1. 8-DNP and 1. 3-DNP on the reversed phase column. The separation of three DNP isomers under different chromatographic conditions was also discussed.     

Determination of dissolved selenium species in environmental samples

This article reports on the technique for the determination of selenium at ppt level and the procedure for the speciation of dissolved selenium in the environmental samples. By combining the high-performance liquid chromatography (HPLC) and a fluorescent detector (FLD), this technique permits the determination of selenium at 0.001 μg/L for Se(IV) and 0.005 μg/L for Se(VI) and the total concentration of selenium for a sample volume of 20 ml. In the speciation procedure, Se(IV) is firstly determined based on the selectivity of 2, 4 - diaminonaphthalene (DAN), the Se (VI) and the total element concentration are determined after reduced to Se(IV) by boiling in 4 mol/L HCl and by digesting in HNO3-HClO4 mixture, respectively. Discussions are given on the relationship between selenium speciation in waters and soil water extract and solution pH, EH and total organic carbon concentration (TOC).     

MODIS_NDVI在白洋淀蝗虫害监测中的应用

运用不同年份蝗虫发育过程中的遥感影像。结合实地调查反映资料，研究了MODIS归一化植被指数(NDVI)在监测蝗虫害中的应用。结果表明，该指数不仅能反映芦苇地蝗虫害的是否发生。还能反映不同区域蝗虫害的发生程度。在蝗虫卵孵化期的MODIS—NDVI图像上。指数值介于0．425～0．567的区域为蝗虫最适宜孵化区，高于0．732的区域则不利于蝗虫卵的孵化。这些研究结果为监测和预警农业蝗虫害的发生提供重要的依据。