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281.
The current study was designed to investigate the potential human health risks associated with consumption of food crops contaminated with toxic heavy metals. Cadmium (Cd) concentration in surface soils; Cd, lead (Pb) and chromium (Cr) in the irrigation water and food crops were above permissible limits. The accumulation factor (AF) was >1 for manganese (Mn) and Pb in different food crops. The Health Risk Index (HRI) was >1 for Pb in all food crops irrigated with wastewater and tube well water. HRI >1 was also recorded for Cd in all selected vegetables; and for Mn in Spinacia oleracea irrigated with wastewater. All wastewater irrigated samples (soil and food crops) exhibited high relative contamination level as compared to samples irrigated with tube well water. Our results emphasized the need for pretreatment of wastewater and routine monitoring in order to avoid contamination of food crops from the wastewater irrigation system. 相似文献
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João Marcelo de Castro e Sousa Ana Paula Peron Louridânya da Silva e Sousa Mércia de Moura Holanda Ataíde de Macedo Vieira Lima Vitor Alves de Oliveira Felipe Cavalcanti Carneiro da Silva Leonardo Henrique Guedes de Morais Lima Leomá Albuquerque Matos Sandra Maria Mendes de Moura Dantas Raí Pablo Sousa de Aguiar Muhammad Torequl Islam Ana Amélia de Carvalho Melo-Cavalcante Cláudia Costa Bonecker Horácio Ferreira Júlio Junior 《Environmental monitoring and assessment》2017,189(6):301
In general, tropical rivers have a great impact on human activities. Bioaccumulation of toxins is a worldwide problem nowadays and has been, historically, overlooked by the supervisory authorities. This study evaluated cytogenotoxic effects of Guaribas river (a Brazilian river) water during dry and rainy seasons of 2014 by using the Allium cepa test system. The toxicogenetic variables, including root growth, mitotic index, and chromosomal aberrations, were analyzed in meristematic cells of A. cepa exposed to water samples taken from the up-, within, and downstream of the city Picos (state: Piauí). The physical-chemical parameters were also analyzed to explain water quality and possible anthropogenic action. Additionally, the presence of heavy metals was also analyzed to explain water quality and possible damaging effects on eukaryotic cells. The results suggest that the river water exerted cytotoxic, mutagenic, and genotoxic effects, regardless of the seasons. In addition, Guaribas river presented physico-chemical values outside the Brazilian laws, which can be a characteristic of human pollution (domestic sewage, industrial, and local agriculture). The genetic damage was positively correlated with higher levels of heavy metals. The pollution of the Guaribas river water may link to the chemical contamination, including the action of heavy metals and their impacts on genetic instability in the aquatic ecosystem. In conclusion, necessary steps should be taken into account for further toxicogenetic studies of the Guaribas river water, as it has an influence in human health of the same region of Brazil. 相似文献
284.
Saeed R Sattar A Iqbal Z Imran M Nadeem R 《Environmental monitoring and assessment》2012,184(4):1909-1919
Environmental impact assessment (EIA) is a policy tool used for evaluating a project proposal from physical and socioeconomic
environmental perspectives. Its aim is to reduce the impact of development on environment, hence, ensuring environmental sustainability.
It is mandatory to submit an Environmental Impact Statement before starting a mega project as required by Environmental Protection
Act of 1997 and Environmental Policy of Pakistan. Public consultation plays a key role in an EIA system, identifying the likely
aspects and impacts of a development activity. This aspect has been ignored in effective enactment of environmental legislation
in Pakistan. Sufficient legislative instruments are there to support EIA system in the country but the agencies responsible
for the enforcement of environmental regulations have failed to do so. The current research gives an insight into the actual
status of EIA system in Pakistan along with the feedback of EIA specialists and university teachers of the concerned departments.
A new index has been devised on the basis of questionnaire response to work out the overall performance of EIA system in Pakistan
or any other country. The weaknesses and deficiencies of each EIA stage have been worked out for Pakistan and elaborated with
the help of the controversial Zero point Interchange Project in the capital city of Pakistan. 相似文献
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Plant-driven removal of heavy metals from soil: uptake,translocation, tolerance mechanism,challenges, and future perspectives 总被引:2,自引:0,他引:2
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Jun Yang Mingrui Zhou Kaifeng Yu Karina Yew-Hoong Gin Muhammad Hassan Yiliang He 《环境科学学报(英文版)》2022,34(2):343-354
The rapid construction of artificial reservoirs in metropolises has promoted the emergence of city-river-reservoir systems worldwide. This study investigated the environmental behaviors and risks of heavy metals in the aquatic environment of a typical system composed of main watersheds in Suzhou and Jinze Reservoir in Shanghai. Results shown that Mn, Zn and Cu were the dominant metals detected in multiple phases. Cd, Mn and Zn were mainly presented in exchangeable fraction and exhibited high bio... 相似文献
290.
Cement industry is an intensive source of fuel consumption and greenhouse gases (GHGs) emissions. This industry is responsible for 5% of GHGs emissions and is among the top industrial sources of carbon dioxide (CO2) emissions. Therefore, CO2 emissions reduction from cement production process has been always an appealing subject for researches in universities and industry. Various efforts have been carried out to mitigate the huge mass of CO2 emissions from the cement industry. Although, majority of these strategies are technically viable, due to various barriers, the level of CO2 mitigation in cement industry is still not satisfactory. Among numerous researches on this topic, only a few have tried to answer why CO2 abatement strategies are not globally practiced yet. This work aims to highlight the challenges and barriers against widespread and effective implementation of CO2 mitigation strategies in the cement industry and to propose practical solutions to overcome such barriers. 相似文献