黄河下游泥沙灾害初步研究

基于黄河下游对泥沙运动与泥沙灾害发生的关系问题进行了分析。认为下游泥沙灾害类型主要包括洪水、河岸侵蚀、土地沙化、水涝和土地盐碱化, 并认为改造下游泥沙灾害环境应通过改变泥沙堆积分布入手。     

交通安全技术研究的范围与发展趋势

概括地分析了影响道路交通安全的因素,论述了交通安全技术研究的范围及世纪之交交通安全技术发展趋势,并指出未来交通事故的严峻性。     

从世界银行对二滩水电站环境影响评估中得到的启示

本文介绍了二滩水电站环境影响评价，以及世界银行评估过程中专家提出的一系列环境问题，并结合我院１０多年来的环境影响评价工作简述几点启示，供参考。     

Heavy metals extraction from contaminated soil: recovery of the flushing solution

The optimum conditions for the recovery of copper from a contaminated soil by using the soil flushing technique are evaluated. Tests on a soil artificially contaminated with copper chloride were carried out in order to evaluate the influence of the speed of percolation and of the chelating agent concentration (aqueous solution of an ethylendiaminotetraacetic acid di-sodium salt Na2-EDTA). At pH=7.3 an efficiency up to 93.9% for copper extraction was achieved by flushing 500 ml of Na2-EDTA 0.05 M solution and 100 ml of pure water at 0.792 cm/h. At these operating conditions the formation of EDTA complexes with other competitive cations (calcium and iron) was negligible. The experimental results were in agreement with the ones obtained using a model describing the chemistry of metal extraction. This model assessed that above pH=6 the formation of calcium and iron EDTA complexes was excluded and only the chelation of copper was allowed. The recovery of 91.6% of EDTA was also achieved by evaporating and acidifying the extracted solution: after filtration, solid EDTA was obtained, through the addition of sodium hydroxide Na2-EDTA. About 99.5% of the extracted copper was finally precipitated under alkaline conditions from the liquid phase.     

AB法工艺优化脱氮除磷的探讨

介绍了AB法工艺的原理、特点以及该工艺的脱氮除磷效果，重点探讨了新的改进方法并对改进的可行性和优点进行了分析。     

Risk analysis for road and rail transport of hazardous materials: a simplified approach

A simplified approach to transportation risk analysis for road and rail transport of dangerous goods is proposed, which is based on the use of a product databank, containing the impact areas for a number of pre-selected accidental scenarios, and on the selection of a few typical average values of the involved parameters, relevant to the type of transport activity and to the route. Such an approach enables also a non-specialist to very rapidly perform a transportation risk analysis, obtaining both individual and societal risk measures for the study case(s): the results may be used to support a decision making process, and/or as a basis for a more in deep analysis.     

Organochlorine pesticides,PCBs and heavy metals in tissues of the mullet Liza aurata in lake Ganzirri and Straits of Messina (Sicily,Italy)

The aim of this research was to investigate the presence of organochlorine pesticides, PCBs and heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in fish living in lake Ganzirri and the Straits of Messina, using the mullet Liza aurata as a "biological indicator". Different tissues of Liza aurata, which include the muscle, gill and vertebral column, were taken for analyses. Quantitative determination of the organochlorine compounds was performed by GC-ECD and confirmed with GC-MS. The concentrations of "essential" and "toxic" heavy metals were determined by Atomic Absorption Spectrophotometry. For the mullets of lake Ganzirri, the study showed DDE in three samples of gills and one of muscle, at concentrations below the MRL; no appreciable residues of PCBs (Aroclor 1232 series) were found. The concentrations of Zn and Cu were much higher than those of the "toxic" metals. No traces of organochlorine pesticides and PCBs were found in the individuals from the Straits of Messina. Therefore, these results indicate that these two environments are not at toxicological risk.     

广东省香蕉寒害风险分析

根据各地寒害及香蕉的产量资料,从寒害对香蕉产量的影响出发,对广东省各地香蕉的灾损率、易灾性进行了分析,以寒害风险指数作为区划指标,对广东省的香蕉寒害风险进行了区划,并作了分区评述。     

黄河三角洲农业开发与可持续发展研究

本文分析了黄河三角洲农业开发的有利条件、开发现状和存在的主要问题,探讨了农业生产的合理布局,提出了农业可持续发展的对策．