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The paper presents the application of the hyphenated technique - high-performance liquid chromatography with atomic absorption spectrometry detection with hydride generation (HPLC-HG-AAS) - in the determinations of inorganic forms of arsenic: As(III) and As(V) in the exchangeable fraction of flood deposits. The separation of analytical signals of the determined arsenic forms was obtained using an ion-exchange column in a chromatographic system with the atomic absorption spectrometer as a detector, at the determination limits of 5 ng g−1 for As(III) and 10 ng g−1 for As(V). Flood deposits were collected after big flood event in valley of the Warta river which took place in summer 2010. Samples of overbank deposits were taken in Poznań agglomeration and vicinity (NW Poland). The results of determinations of arsenic forms in the exchangeable fraction of flood deposits allowed indication of a hypothetical path of deposits migration transported by a river during flood and environmental threats posed by their deposition by flood. 相似文献
33.
Hai Guo Lidia Morawska Congrong He Yanli L. Zhang Godwin Ayoko Min Cao 《Environmental science and pollution research international》2010,17(6):1268-1278
Background, Aim and Scope
The impact of air pollution on school children’s health is currently one of the key foci of international and national agencies. Of particular concern are ultrafine particles which are emitted in large quantities, contain large concentrations of toxins and are deposited deeply in the respiratory tract. 相似文献34.
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Robert Gifford Leila Scannell Christine Kormos Lidia Smolova Anders Biel Stefan Boncu Victor Corral Hartmut Güntherf Kazunori Hanyu Donald Hine Florian G. Kaiser Kalevi Korpela Luisa Marie Lima Angela G. Mertig Ricardo Garcia Mira Gabriel Moser Paola Passafaro José Q. Pinheiro Sunil Saini Toshihiko Sako Elena Sautkina Yannick Savina Peter Schmuck Wesley Schultz Karin Sobeck Eva-Lotta Sundblad David Uzzell 《Journal of environmental psychology》2009
The personal assessments of the current and expected future state of the environment by 3232 community respondents in 18 nations were investigated at the local, national, and global spatial levels. These assessments were compared to a ranking of each country's environmental quality by an expert panel. Temporal pessimism (“things will get worse”) was found in the assessments at all three spatial levels. Spatial optimism bias (“things are better here than there”) was found in the assessments of current environmental conditions in 15 of 18 countries, but not in the assessments of the future. All countries except one exhibited temporal pessimism, but significant differences between them were common. Evaluations of current environmental conditions also differed by country. Citizens' assessments of current conditions, and the degree of comparative optimism, were strongly correlated with the expert panel's assessments of national environmental quality. Aside from the value of understanding global trends in environmental assessments, the results have important implications for environmental policy and risk management strategies. 相似文献
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Lizhu Wang Kevin Wehrly James E. Breck Lidia Szabo Kraft 《Environmental management》2010,46(3):471-483
Assessment of lake impairment status and identification of threats’ type and source is essential for protection of intact,
enhancement of modified, and restoration of impaired lakes. For regions in which large numbers of lakes occur, such assessment
has usually been done for only small fractions of lakes due to resource and time limitation. This study describes a process
for assessing lake impairment status and identifying which human disturbances have the greatest impact on each lake for all
lakes that are 2 ha or larger in the state of Michigan using readily available, georeferenced natural and human disturbance
databases. In-lake indicators of impairment are available for only a small subset of lakes in Michigan. Using statistical
relationships between the in-lake indicators and landscape natural and human-induced measures from the subset lakes, we assessed
the likely human impairment condition of lakes for which in-lake indicator data were unavailable using landscape natural and
human disturbance measures. Approximately 92% of lakes in Michigan were identified as being least to marginally impacted and
about 8% were moderately to heavily impacted by landscape human disturbances. Among lakes that were heavily impacted, more
inline lakes (92%) were impacted by human disturbances than disconnected (6%) or headwater lakes (2%). More small lakes were
impacted than medium to large lakes. For inline lakes, 90% of the heavily impacted lakes were less than 40 ha, 10% were between
40 and 405 ha, and 1% was greater than 405 ha. For disconnected and headwater lakes, all of the heavily impacted lakes were
less than 40 ha. Among the anthropogenic disturbances that contributed the most to lake disturbance index scores, nutrient
yields and farm animal density affected the highest number of lakes, agricultural land use affected a moderate number of lakes,
and point-source pollution and road measures affected least number of lakes. Our process for assessing lake condition represents
a significant advantage over other routinely used methods. It permits the evaluation of lake condition across large regions
and yields an overall disturbance index that is a physicochemical and biological indicator weighted sum of multiple disturbance
factors. The robustness of our approach can be improved with increased availability of high-resolution disturbance datasets. 相似文献
39.
Juan A. Correa Marco A. Ramírez Jean-Paul de la Harpe Domingo Román Lidia Rivera 《Environmental monitoring and assessment》2000,61(2):267-283
We experimentally tested threealternative hypotheses to explain the low algaldiversity and abundance in an intertidal zonereceiving the effluents of the copper mine El Salvadorin northern Chile. Our results demonstrated thatalgae were able to grow at the levels of dissolvedcopper detected in coastal waters of the area. Duringthe assays, growth and regeneration in several red,green and brown adult algae and juvenile Lessonia nigrescens were normal at copper levels of150 g L-1 or, in some cases, higher. Wealso found that the coastal sea water mixed with theeffluent was not lethal to algae, although in somecases minor effects on growth were detected. Theseresults indicate that today's low algal diversity andabundance can not be explained by the current copperlevels in the area nor by the effect of the effluent.Exclusion of grazers, however, resulted in a fastcolonization by various algal species. This, togetherwith atypically high grazer density at the areas underthe influence of the effluent, strongly suggests thatherbivory, a factor not directly related to the miningoperation, is likely to be responsible for the lowalgal diversity and abundance in the studied locality. 相似文献
40.
Water and suspended solids samples were collected at four river stations and from two pulp and paper mill final effluents and analysed for a variety of organic contaminants. Juvenile fish were collected upstream and downstream of the mill discharges. Results showed significant mill inputs of PCBs, PAHs, chlorophenols, dioxins and furans which impacted downstream stations. Juvenile fish analysed downstream of the effluents indicated uptake of PCBs and chlorinated phenols. 相似文献