Volatile Organic Compounds,Spectral Characterization and Morphology of Ammonium Nitrate Fuel Oil (ANFO) Samples

Ammonium nitrate fuel oil is an explosive mixture found in most antipersonnel landmines (APL) buried throughout the Colombian territory. During more than 50 years of internal conflict, the Colombian government has found that trained dogs are the most effective method to detect APL. However, the olfactive signature in ANFO is unknown and also if there are differences in detection related to the explosive manufacturing origin. Therefore, this work begins with the analytical validation of the method used to determine ammonia, in its derivatized form as carbamate, released by home-made ANFO using HS-SPME-GC-FID. Once validated, the method was used to identify ammonia and other organic volatile compounds present in ANFO, under laboratory and simulated field conditions. The validation process includes the evaluation of the optimum conditions for the derivation and extraction of butylcarbamate, the determination of the working ranges with linear response in FID, the limits of detection and quantification, the sensitivity, and the precision. The results of the validation established linearity and sensitivity in a concentration between 20 and 120 mg/L, as well as low limits of detection and quantification of 6.4 and 21.4 mg/L, respectively. Also, an intermediate precision of 11% for butylcarbamate with a repeatability of 8%. The validated method showed in real samples of home-made ANFO besides ammonia, the presence of low molecular methylamines, and also exhibited differences in volatile compositions according to the origin. The objective of this work is to offer a reliable analytical methodology for the extraction and analysis of volatile compounds from ANFO.     

Editorial

Ohne Zusammenfassung

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Editorial

     

STR analysis of artificially degraded DNA-results of a collaborative European exercise

Degradation of human DNA extracted from forensic stains is, in most cases, the result of a natural process due to the exposure of the stain samples to the environment. Experiences with degraded DNA from casework samples show that every sample may exhibit different properties in this respect, and that it is difficult to systematically assess the performance of routinely used typing systems for the analysis of degraded DNA samples. Using a batch of artificially degraded DNA with an average fragment size of approx. 200 bp a collaborative exercise was carried out among 38 forensic laboratories from 17 European countries. The results were assessed according to correct allele detection, peak height and balance as well as the occurrence of artefacts. A number of common problems were identified based on these results such as strong peak imbalance in heterozygous genotypes for the larger short tandem repeat (STR) fragments after increased PCR cycle numbers, artefact signals and allelic drop-out. Based on the observations, strategies are discussed to overcome these problems. The strategies include careful balancing of the amount of template DNA and the PCR cycle numbers, the reaction volume and the amount of Taq polymerase. Furthermore, a careful evaluation of the results of the fragment analysis and of automated allele calling is necessary to identify the correct alleles and avoid artefacts.     

发展中的东盟“中国观”：从威胁到机会？

本文旨在分析为何东盟国家曾经将中国视为威胁，如今却转变观念，将中国视为促进地区稳定和一体化的重要推动力。第一部分将阐述东盟国家对中国的官方立场的变化，即从“中国威胁论”向“中国机会论”的转变。在80年代，当中国的经济开放促进了其与南部周边国家之间的关系时，这种观念的转变尤为突出。第二部分认为，在欧美日经济发展呈现出保护主义趋势，并遭遇发展瓶颈的情况下，中国的发展为东盟国家的经济增长提供了新契机。同时，笔者着重分析了中国从地区的不稳定根源向地区安全保障者转化的原因。第三部分指出，尽管中国与东盟国家之间建立起了特殊关系，但中国无法排斥其他大国，尤其是日本与美国在该地区的影响力。     

An American Perestroika in Dutch Cities? Urban Policy in the Netherlands at the End of a Millennium

This paper discusses the implications of the recent adoption of interactive forms of governance in Dutch urban policy. Advocates of this new approach claim that interactive governance will have positive effects for (1) the quality of urban democracy and urban governability and (2) for the solution of the information problems inherent in coping with (wicked) urban problems. On the basis of an extensive evaluation of the implementation of the new policies in four of the 25 Dutch municipalities involved, these claims are critically assessed.     

Using Private-Public Linkages to Regulate Environmental Conflicts: The Case of International Construction Contracts

The article takes a pluralistic view of the 'trade-environment' conflict by exploring one of the settings of this conflict: the lex constructionis – international construction law. It seeks to unravel the way in which the unique structural-cultural attributes of this legal domain have affected its environmental (in)sensitivity. The article's main argument in that context is that the contractual tradition of the lex constructionis (as manifested in the standard contracts that dominate this field) and its unique institutional structure, have created a culture of ecological indifference. This culture has important practical consequences because of the deep ecological problematic of international construction projects. The article develops an alternative contractual model, which depicts the construction contract as a semi-political mechanism, rather than a private tool. This conceptual change seeks to break the public/private separation that characterizes the contractual discourse in the international construction market. The article explores, further, whether this alternative contractual vision could be realized in practice, and proposes several implementing modules which could further this goal. While the article explores a particular international regime, its methodology and conclusions – in particular, the political-constitutional interpretation of the contract and the critique of the public/private dichotomy (see sections III.3 and III.4) – should be relevant to the regulation of many other (national or international) environmental dilemmas.