排序方式: 共有17条查询结果,搜索用时 15 毫秒
11.
Edison Barbieri Elisangela de Andrade Passos Alexandre Filippini Izaias Souza dos Santos Carlos Alexandre Borges Garcia 《Environmental monitoring and assessment》2010,169(1-4):631-638
Cd, Co, Cr, Cu, Mn, Ni, Zn, and Pb were measured in feather samples of adult, subadult, and juvenile of Larus dominicanus, sampled in the Florianólis, SC, in the south of Brazil in December 2005, by flame atomic absorption spectrophotometry. The average of the distribution of Cd concentration in adult feathers (0.072 μg g???1) was significantly different than that found in juvenile feathers (0.021 μg g???1). Cu concentration averages were not significantly different between adults (13.30 μg g???1), subadults (9.67 μg g???1), and juveniles (13.76 μg g???1). For adults and juveniles there was significant difference in feather concentrations for Cd, Co, Cr, Ni, and Pb. The distribution of Mn concentration averages in feathers differs between adults (11.36 μg g???1) and juveniles (1.184 μg g???1). Ni concentration averages of adults (5.92 μg g???1) were significantly higher than those of juveniles (2.23 μg g???1). For Pb, concentration averages were significantly higher in adults (7.53 μg g???1) than in juveniles (1.47 μg g???1). The concentration of Co and Cr in juvenile and subadults are statistically different when compared with the adults. In the present study, levels of Cd, Co, Cr, Mn, Ni, Zn, and Pb increased with age. The concentrations of essential trace elements in L. dominicanus were generally comparable to values reported in other studies. With non-essential metals (Cd, Pb, and Ni), in our study, L. dominicanus had lower values than those reported for their northern Atlantic counterparts. 相似文献
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Ribeiro E Tauhata L dos Santos EE da Silveira Corrêa R 《Journal of environmental radioactivity》2011,102(2):145-152
This paper presents the results of the Environmental Monitoring Program for the Radioactive waste repository of Abadia de Goiás, which was originated from the accident of Goiania, conducted by the Regional Center of Nuclear Sciences (CRCN-CO) of the National Commission on Nuclear Energy (CNEN), from 1998 to 2008.The results are related to the determination of 137Cs activity per unit of mass or volume of samples from surface water, ground water, depth sediments of the river, soil and vegetation, and also the air-kerma rate estimation for gamma exposure in the monitored site.In the phase of operational Environmental Monitoring Program, the values of the geometric mean and standard deviation obtained for 137Cs activity per unit of mass or volume in the analyzed samples were (0.08 ± 1.16) Bq.L−1 for surface and underground water, (0.22 ± 2.79) Bq.kg−1 for soil, and (0.19 ± 2.72) Bq.kg−1 for sediment, and (0.19 ± 2.30) Bq.kg−1 for vegetation. These results were similar to the values of the pre-operational Environmental Monitoring Program.With these data, estimations for effective dose were evaluated for public individuals in the neighborhood of the waste repository, considering the main possible way of exposure of this population group.The annual effective dose obtained from the analysis of these results were lower than 0.3 mSv.y−1, which is the limit established by CNEN for environmental impact in the public individuals indicating that the facility is operating safely, without any radiological impact to the surrounding environment. 相似文献
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Freeman Ntuli Pardon K. Kuipa Edison Muzenda 《Environmental science and pollution research international》2011,18(3):479-484
Introduction
Monitoring of effluent discharges from industrial establishments discharging directly into municipality sewers is one of the major water pollution control activities conducted by municipalities. For largely industrialised municipalities, the task can be quite expensive and not effective if sampling programmes are not properly designed. In most cases, samples are randomly collected without proper knowledge of the discharge patterns of various industries. As a result, the information obtained does not give a good reflection of the quality of effluent being discharged. 相似文献14.
Balamurali G. S. Edison Alitha Somanathan Hema Kodandaramaiah Ullasa 《Behavioral ecology and sociobiology》2019,73(3):1-10
Behavioral Ecology and Sociobiology - In sand fiddler crabs, Uca pugilator, contests between residents and intruders for breeding burrows often escalate to forceful pinching. In these contests, we... 相似文献
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The main purpose of the present study was to detect the acute toxicity of cadmium (Cd) in F. paulensis and to investigate its effect on oxygen consumption and ammonium excretion different salinities. First, we examined the acute toxicity of Cd in F. paulensis at 24, 48, 72, and 96-h lethal concentration (LC50). Cd was significantly more toxic at 5 salinity than at 20 and 36. The oxygen consumption and ammonium excretion were estimated through experiments performed on each of the twelve possible combinations of three salinities (36, 20 and 5), at temperature 20 °C. Cd showed a reduction in oxygen consumption at 5 salinity, the results show that the oxygen consumption decreases with respect to the Cd concentration. At the highest Cd concentration employed (2 mg L−1), the salinity 5 and the temperature at 20 °C, oxygen consumption decreases 53.7% in relation to the control. In addition, after separate exposure to Cd, elevation in ammonium excretion was obtained, wish were 72%, 65% and 95% higher than the control, respectively. The results show that Cd is more toxic to F. paulensis at lower salinities. 相似文献
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Machado W Rodrigues AP Bidone ED Sella SM Santelli RE 《Environmental science and pollution research international》2011,18(6):1033-1036