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891.
De Angelis G Medici F Montereali MR Pietrelli L 《Waste management (New York, N.Y.)》2002,22(8):925-930
The performance of products arising from the stabilization/solidification of slags from lead batteries recycle into a Portland cement matrix has been evaluated not only in order to get a stabilized waste to be disposed of according to the current legislation, but also to obtain a recyclable material, with both economic and environmental benefits. Under this respect a detailed characterization of raw slags has been performed and different slag-cement samples have been prepared by varying the slag content. The parameters related to the cementation process have been evaluated and a series of tests on the final waste forms have been carried out, aimed at assessing both mechanical performance and leaching behaviour. In spite of the acceptable values for flexural, compressive and tensile strength, however, the high release of lead from the solidification products seems to be a limiting factor for a reusable material. While explanations of such phenomenon are given (high alkalinity of Portland cement; early "doping" of cementitious components by lead in the amorphous state), the main conclusion of the research work is that further efforts should be addressed to the adoption of a different or a modified incorporation matrix. 相似文献
892.
Alessandro Paletto Federica Maino Isabella De Meo Fabrizio Ferretti 《Environmental management》2013,51(2):414-422
Values are generally defined as social facts that orientate individual and collective actions, and consequently influence political, economic and social systems. The evaluation of natural resource values is considered an important instrument to support decision making in environmental policy. The forest is an important renewable resource that provides a mix of social, economic and environmental values for society. The paper presents a survey method to collect and analyse individual preferences relating to three macro-categories of forest values. The survey method was tested in the Trentino region (north-east of the Italian Alps) and will soon be extended to other areas. The results of the questionnaires provided evidence that the forest economic value is perceived as least important, while the environmental values were appreciated the most. Regarding the principle social variables, males tended to give higher scores to all three macro-categories compared to females. Moreover, people with a low education also gave higher scores to all three categories in comparison to the more educated individuals. 相似文献
893.
采用加速溶剂萃取处理土壤样品,用超高效液相色谱串联质谱法测定样品中15种氨基甲酸酯类农药残留,方法在5.00μg/L~200μg/L范围内线性良好,检出限为0.3μg/kg~0.5μg/kg,加标回收率为78.9% ~116%,6次测定结果的RSD为0.7% ~15.7%.试验表明:不同地域的6种标准土壤对15种目标物... 相似文献
894.
The responses to pH of abiotic interactions between dissolved humic substances, iron and phosphate were investigated by examining redistributions of 55FeCl3 and 32PO43− added to epilimnetic lakewater from Lake Skjervatjern. The simultaneous movement of 55Fe and 32P to fractions of 10 000–20 000 and > 100 000 Daltons nominal molecular weight, as indicated by Sephadex gel filtration, diminished in response to decreasing pH. Variations in transformations to larger molecular size fractions with incubation time revealed by gel filtration were erratic, but indicated that transformations of added 55Fe and 32P are complete after circa 24 h. Movement of 32P to particle size fractions (>0.2 μm) was not dependent on pH, whilst transformations of 55Fe to material of particle size increased as pH was lowered. Precipitation of added 55Fe and 32P was minimal at all pH values tested. Responses of precipitation losses to pH were not coincident for both radionuclides. 相似文献
895.
896.
Noncrop areas such as hedgerows in agricultural landscapes can perform several ecological and agronomic functions (e.g., habitat,
movement corridors, windbreak, etc.), but their dynamics and drivers of changes are often poorly known. We conducted a study
in three agricultural landscapes of southern Quebec, Canada, to assess and compare the spatial and temporal (1958–1997) dynamics
of three hedgerow networks in relation to geomorphic conditions (marine, glacial, and mixed deposit) and land-use changes.
Hedgerow networks were mapped and described in terms of their structure (density, degree of connectivity, and presence of
trees or shrubs) and their relationship to other components of the landscape (connection to woodland). Relationships were
assessed in time and space using nonparametric correlation, Mantel test, and principal components analysis (PCA). Results
show significant differences between hedgerow structure for the three landscapes and distinct temporal and spatial dynamics
that can be related to changes in management practices and agricultural policies. On marine deposits, increases in hedgerow
density did not always correspond to an increase in their degree of connectivity, suggesting a possible reduction in network
quality. On glacial deposits, hedgerow density declined following abandonment of agricultural land, but rather than disappearing,
these linear structures were integrated into adjacent brush or forested areas. Our analysis reveals the complex spatial and
temporal dynamics of the hedgerow networks and highlights the need to take into account spatial attributes such as connectivity
and connection to woodland to evaluate more accurately overall network quality. 相似文献
897.
A kinetic model is developed for the oxidation of phenolic compounds by Fenton's reagent. In the first stage a rigorous kinetic model is applied to calculate the different kinetic rate constants for the oxidation process of p-hydroxybenzoic acid. In a second phase a competitive method is applied to calculate these kinetic constants for another 10 phenolic compounds present in agroindustrial and pulp paper wastewaters. These 10 phenolic compounds were: beta-resorcylic acid, 3-(4-hydroxyphenyl)-propionic acid, ferulic acid, protocatechuic acid, caffeic acid, p-coumaric acid, vanillic acid, syringic acid, veratric acid and 3,4,5-trimethoxybenzoic acid. 相似文献
898.
The "Atlas of caesium deposition on Europe after the Chernobyl accident" was prepared within the framework of the Joint Study Project 6 (JSP6) of the collaborative programme on the consequences of the Chernobyl accident between the European Commission and the Ministries responsible for Chernobyl affairs in Belarus, Russia and Ukraine. The radiological data provided by scientific institutes and competent authorities of more than 30 European countries were integrated into an information platform. Data validation and intercomparison were therefore essential before the interpretation of the deposition with the help of isoline maps prepared with a geographic information system (GIS) could be done. The data validation was a two-step procedure: after performing a primary logical consistency check, other techniques based on spatial statistics were used to outline uncertain data. The purpose of this paper is to present these validation methods and to discuss the advantages and constraints of these techniques. Rather than trying to improve the techniques of spatial data analysis, suggestions are made on how an adaptation of the sampling information could improve the final result. 相似文献
899.
Dr. Luc De Catte Daniel De Wolf Johan Smitz Adel Bougatef Jean De Schepper Walter Foulon 《黑龙江环境通报》1994,14(8):762-765
We present a case of persistent fetal supraventricular tachycardia where transplacental and direct fetal treatment with amiodarone caused an iatrogenic hypothyroidism. This condition was successfully managed with the intra-amniotic instillation of 250 μg of L-thyroxine weekly, for 3 weeks. A male infant was delivered at 32 weeks by Caesarean section. The neonatal electrocardiogram showed Wolf-Parkinson-White (WPW) syndrome, which was controlled by digoxin alone. Thyroid function normalized quickly and the baby is developing normally. 相似文献
900.
Based on observations in animals, there is an increasing evidence that a number of persistent organochlorine pollutants can alter the endocrine homeostasis, this resulting in toxic effects in particular in the developing organism. However, the role of these chemicals in determining endocrine-related diseases in humans, and possibly a decrease of fertility, is still controversial. Exposure data concerning the human reproductive system are essential for risk assessment. Based on this, the occurrence in follicular fluid of polychlorobiphenyls (PCBs), 2,3,7,8-chlorosubstituted polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), 1,1,1-trichloro-2,2-bis(4-chlorophenyl)-ethane (p,p'-DDT) and its metabolites, and hexachlorobenzene (HCB) was investigated. With respect to PCBs, the sum of the three most abundant congeners (PCBs 138, 153 and 180) was 1230 ng/g, lipid basis (0.37 ng/g, wet weight). Congener distribution profile overlapped what is usually observed in other human tissues, as blood and milk. PCDDs, PCDFs, p,p'-DDT and 1,1-dichloro-2,2-bis(4-chlorophenyl)-ethane (p,p'-DDD) were below their determination limits. 1,1-dichloro-2,2-bis(4-chlorophenyl)-ethene (p,p'-DDE) and HCB were detected in concentrations respectively in the order of 700 and 70 ng/g, lipid basis (approximately 0.2 and approximately 0.02 ng/g, wet weight). 相似文献