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621.
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Persistent bioaccumulative and toxic (PBT) pollutants are chemical contaminants that pose risks to ecosystems and human health.
For these reasons, available tissue contaminant data from the US EPA Environmental Monitoring and Assessment Program’s National
Coastal Assessment were examined to estimate to what areal extent PBTs are found in US estuarine resources. The data document
composite, whole-body tissue chemical concentrations for 736 sampling sites across Northeast, Southeast, Gulf of Mexico, and
West Coast estuaries. Tissue chemical concentrations were compared to US EPA non-cancer risk guidelines for recreational fishers,
because of a lack of ecological guidelines for these chemical concentrations. Samples were analyzed for 23 PAH compounds,
21 PCB congeners, 6 DDT derivatives and metabolites, 14 chlorinated pesticides (other than DDT) and 13 metals, including mercury.
Total PCBs were found to exceed recreational fisher guidelines most frequently (31% of samples evaluated), followed by mercury
(29%), total PAHs (21%), and DDT and its metabolites, DDD and DDE (11%). Toxaphene, cadmium and dieldrin were found but in
fewer than 1% of the samples. 相似文献
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Kerstin Ronneberger Maria Berrittella Francesco Bosello Richard S. J. Tol 《Environmental Modeling and Assessment》2009,14(2):149-168
In this paper, the global agricultural land use model Kleines Land Use Model is coupled to an extended version of the computable general equilibrium model (CGE) Global Trade Analysis
Project in order to consistently assess the integrated impacts of climate change on global cropland allocation and its implication
for economic development. The methodology is innovative as it introduces dynamic economic land-use decisions based also on
the biophysical aspects of land into a state-of-the-art CGE; it further allows the projection of resulting changes in cropland
patterns on a spatially more explicit level. A convergence test and illustrative future simulations underpin the robustness
and potentials of the coupled system. Reference simulations with the uncoupled models emphasise the impact and relevance of
the coupling; the results of coupled and uncoupled simulations can differ by several hundred percent.
相似文献
Francesco BoselloEmail: Email: |
625.
通过多年在粤港空气监控系统中的O3自动监测实践,阐述了O3标准气浓度传递认证的范例性解决方案,并在O3气体样品输送、O3分析仪器性能维护及在线检查校准用标准气等方面提出了实用的技术方法。 相似文献
626.
This essay builds from Samantha Senda-Cook's 2013 article, “Materializing Tensions,” to explore the material rhetorics of the so-called “social trails” of the Apostle Islands National Lakeshore. These improvised, foot-worn pathways, diverging from and running alongside official Park Service trails, materialize a tension between what Michel de Certeau termed “strategies” and “tactics,” revealing how both are always at play in park and preserve trailspace and how the movements of the individual trail walker actualize and perpetuate a common concept of place. The study demonstrates and advocates close rhetorical attention to material aspects of the biophysical environment and the way that physical traces of many individuals over time can influence the subsequent actions and interpretations of others. The final discussion argues that as further tensions in trailspace rhetorics are identified rhetorical analysis must not fail to account for them. 相似文献
627.
Ryan C. Lewis John D. Meeker Karen E. Peterson Joyce M. Lee Gerry G. Pace Alejandra Cantoral Martha Maria Téllez-Rojo 《Chemosphere》2013
Exposure to endocrine disrupting chemicals such as bisphenol A (BPA) and phthalates is prevalent among children and adolescents, but little is known regarding important sources of exposure at these sensitive life stages. In this study, we measured urinary concentrations of BPA and nine phthalate metabolites in 108 Mexican children aged 8–13 years. Associations of age, time of day, and questionnaire items on external environment, water use, and food container use with specific gravity-corrected urinary concentrations were assessed, as were questionnaire items concerning the use of 17 personal care products in the past 48-h. As a secondary aim, third trimester urinary concentrations were measured in 99 mothers of these children, and the relationship between specific gravity-corrected urinary concentrations at these two time points was explored. After adjusting for potential confounding by other personal care product use in the past 48-h, there were statistically significant (p < 0.05) positive associations in boys for cologne/perfume use and monoethyl phthalate (MEP), mono(3-carboxypropyl) phthalate (MCPP), mono(2-ethyl-5-hydroxyhexyl) phthalate (MEHHP), and mono(2-ethyl-5-oxohexyl) phthalate (MEOHP), and in girls for colored cosmetics use and mono-n-butyl phthalate (MBP), mono(2-ethylhexyl) phthalate (MEHP), MEHHP, MEOHP, and mono(2-ethyl-5-carboxypentyl) phthalate (MECPP), conditioner use and MEP, deodorant use and MEP, and other hair products use and MBP. There was a statistically significant positive trend for the number of personal care products used in the past 48-h and log-MEP in girls. However, there were no statistically significant associations between the analytes and the other questionnaire items and there were no strong correlations between the analytes measured during the third trimester and at 8–13 years of age. We demonstrated that personal care product use is associated with exposure to multiple phthalates in children. Due to rapid development, children may be susceptible to impacts from exposure to endocrine disrupting chemicals; thus, reduced or delayed use of certain personal care products among children may be warranted. 相似文献
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629.
630.
In Europe, sustainable development (SD) is pursued with not one but two overarching strategies, i.e., the so-called Lisbon and SD strategies. While the Lisbon Strategy is a genuinely European response to global economic and social pressures, SD strategies are national efforts corresponding with international (mainly United Nations) guidance to better coordinate and integrate economic, social and, in particular, environmental policies. The present paper explores the vertical coordination and coherence of the two pan-European strategies. After reviewing the international background of SD strategies and the EU origins of the Lisbon strategy, the paper characterizes and compares the governance architectures of the two strategies. With a solid background on how vertical policy integration functions in the two processes, the paper then shows how this affects the coherence of respective strategy structures and monitoring indicators. Based on an extensive empirical stocktaking study of the objectives and indicators in Lisbon and SD strategies across Europe it is shown that, despite the stronger European coordination through the Open Method of Coordination, the Lisbon process entailed only slightly more coherent national strategies than international guidance did in the context of SD strategies. Thus, the paper concludes that the influence international organizations such as the UN and the OECD have on national policy-making must not be underestimated. 相似文献