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Elisa Petranich Stefano Covelli Alessandro Acquavit Jadran Faganeli Milena Horvat Marco Contin 《环境科学学报(英文版)》2018,30(6):5-23
The Marano and Grado Lagoon is well known for being contaminated by mercury(Hg) from the Idrija mine(Slovenia) and the decommissioned chlor-alkali plant of Torviscosa(Italy).Experimental activities were conducted in a local fish farm to understand Hg cycling at the sediment–water interface. Both diffusive and benthic fluxes were estimated in terms of chemical and physical features. Mercury concentration in sediments(up to 6.81 μg/g)showed a slight variability with depth, whereas the highest methylmercury(MeHg) values(up to 10 ng/g) were detected in the first centimetres. MeHg seems to be produced and stored in the 2–3 cm below the sediment–water interface, where sulphate reducing bacteria activity occurs and hypoxic–anoxic conditions become persistent for days. DMeHg in porewaters varied seasonally(from 0.1 and 17% of dissolved Hg(DHg)) with the highest concentrations in summer. DHg diffusive effluxes higher(up to 444 ng/m~2/day) than those reported in the open lagoon(~ 95 ng/m~2/day), whereas DMeHg showed influxes in the fish farm(up to-156 ng/m~2/day). The diurnal DHg and DMeHg benthic fluxes were found to be higher than the highest summer values previously reported for the natural lagoon environment. Bottom sediments, especially in anoxic conditions, seem to be a significant source of MeHg in the water column where it eventually accumulates. However, net fluxes considering the daily trend of DHg and DMeHg, indicated possible DMeHg degradation processes. Enhancing water dynamics in the fish farm could mitigate environmental conditions suitable for Hg methylation. 相似文献
143.
Fernando Reynel Fundora Tellechea Marco Antônio Martins Alexsandro Araujo da Silva Emanuela Forestieri da Gama-Rodrigues Meire Lelis Leal Martins 《Environmental science and pollution research international》2016,23(18):18027-18033
This study evaluated the use of sugarcane filter cake and nitrogen, phosphorus and potassium (NPK) fertilization in the bioremediation of a soil contaminated with diesel fuel using a completely randomized design. Five treatments (uncontaminated soil, T1; soil contaminated with diesel, T2; soil contaminated with diesel and treated with 15 % (wt) filter cake, T3; soil contaminated with diesel and treated with NPK fertilizer, T4; and soil contaminated with diesel and treated with 15 % (wt) filter cake and NPK fertilizer, T5) and four evaluation periods (1, 60, 120, and 180 days after the beginning of the experiment) were used according to a 4?×?5 factorial design to analyze CO2 release. The variables total organic carbon (TOC) and total petroleum hydrocarbons (TPH) remaining in the soil were analyzed using a 5?×?2 factorial design, with the same treatments described above and two evaluation periods (1 and 180 days after the beginning of the experiment). In T3 and T5, CO2 release was significantly higher, compared with the other treatments. Significant TPH removal was observed on day 180, when percent removal values were 61.9, 70.1, 68.2, and 75.9 in treatments T2, T3, T4, and T5, respectively, compared with the initial value (T1). 相似文献
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Elena Cantarello Claude E. Steck Paolo Fontana Diego Fontaneto Lorenzo Marini Marco Pautasso 《Die Naturwissenschaften》2010,97(3):265-271
Recent large-scale studies have shown that biodiversity-rich regions also tend to be densely populated areas. The most obvious
explanation is that biodiversity and human beings tend to match the distribution of energy availability, environmental stability
and/or habitat heterogeneity. However, the species–people correlation can also be an artefact, as more populated regions could
show more species because of a more thorough sampling. Few studies have tested this sampling bias hypothesis. Using a newly
collated dataset, we studied whether Orthoptera species richness is related to human population size in Italy’s regions (average
area 15,000 km2) and provinces (2,900 km2). As expected, the observed number of species increases significantly with increasing human population size for both grain
sizes, although the proportion of variance explained is minimal at the provincial level. However, variations in observed Orthoptera
species richness are primarily associated with the available number of records, which is in turn well correlated with human
population size (at least at the regional level). Estimated Orthoptera species richness (Chao2 and Jackknife) also increases
with human population size both for regions and provinces. Both for regions and provinces, this increase is not significant
when controlling for variation in area and number of records. Our study confirms the hypothesis that broad-scale human population–biodiversity
correlations can in some cases be artefactual. More systematic sampling of less studied taxa such as invertebrates is necessary
to ascertain whether biogeographical patterns persist when sampling effort is kept constant or included in models. 相似文献
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Valente Tommaso Ventura Daniele Matiddi Marco Sbrana Alice Silvestri Cecilia Piermarini Raffaella Jacomini Carlo Costantini Maria Letizia 《Environmental science and pollution research international》2023,30(1):298-309
Environmental Science and Pollution Research - Microplastic pollution is one of the greatest environmental concerns for contemporary times and the future. In the last years, the number of... 相似文献
149.
Rai Mahendra Ingle Avinash P. Gupta Indarchand Pandit Raksha Paralikar Priti Gade Aniket Chaud Marco V. dos Santos Carolina Alves 《Environmental Chemistry Letters》2019,17(1):277-290
Environmental Chemistry Letters - Food spoilage is a major global concern due to the lack of proper packaging technology. Nanotechnology is expected to improve food packaging. Indeed, novel... 相似文献
150.