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921.
Thallium: a review of public health and environmental concerns 总被引:22,自引:0,他引:22
Thallium (Tl) is a rare but widely dispersed element. All forms of thallium are soluble enough to be toxic to living organisms. Thallium is more toxic to humans than mercury, cadmium, lead, copper or zinc and has been responsible for many accidental, occupational, deliberate, and therapeutic poisonings since its discovery in 1861. Its chemical behavior resembles the heavy metals (lead, gold and silver) on the one hand and the alkali metals (K, Rb, Cs) on the other. It occurs almost exclusively in natural waters as monovalent thallous cation. The solubility of thallous compounds is relatively high so that monovalent thallium is readily transported through aqueous routes into the environment. Tl can be transferred from soils to crops readily and accrues in food crops. The fascinating chemistry and high toxicity potential make thallium and its compounds of particular scientific interest and environmental concern. Thallium was detected in base-metal mining effluents. The conventional removal of heavy metals from wastewater has little effect on thallium. In this review, various treatment options and removal technologies are enumerated in order to protect the environment from thallium toxicity. 相似文献
922.
Environmental Science and Pollution Research - Natural water sources are habitually marred by insidious anthropogenic practices and municipal wastewater discharges that contain either of xenobiotic... 相似文献
923.
Regional Environmental Change - Increasing demands, climate change and variability, and over-allocation pose tremendous challenges for the sustainable management of water resources. Federal river... 相似文献
924.
Awasthi Anjali Awasthi Kumud Kant John P. J. 《Environmental science and pollution research international》2021,28(34):46334-46335
Environmental Science and Pollution Research - 相似文献
925.
John E. Tilton 《Natural resources forum》1989,13(3):198-203
In the early years after World War II the developed countries, and in particular the USA, acounted for a large portion of world metal consumption. Since that time a shift in consumption has occurred favouring the industrialized states of Western Europe, the centrally planned economies of Eastern Europe, and more recently Japan and the other Pacific Rim countries of Asia (PRA). After assessing the magnitude of the shift in metal consumption toward the PRA countries, this paper focuses on differences in economic growth, the nature of trade, and other factors responsible. Finally, the implications of the shift are considered for the nature of metal trade, the competitiveness of metal exporting countries, the structure of international metal markets, and the future availability of metal supplies. 相似文献
926.
927.
Environment as the Stage for Economic Actors 总被引:6,自引:0,他引:6
John E Coulter Shi Lei Samantha Jenkins 《中国人口.资源与环境(英文版)》2007,5(1):3-8
The relative importance of economics and environment in debate may soon be reversed due to the influence of three fac- tors. Firstly, in the global economy it is hard to hide the unwanted products of economic processes. Secondly, huge advances in sci- ence will reduce the imperfect knowledge of markets, making some monitoring and analyzing tools show the design of sensible and equitable livelihood in communities, which is more important than the motivation of maximising profits for some individuals or firms. Thirdly, China, as the last major player on the planet to take on economic growth, comes from traditions fundamentally differ- ent from those economies that have experienced the Industrial Revolution previously. Its challenges with sustainability and en- vironmental conservation predate Western economics by millennia, and it is implementing policies domestically and starting to work on the world stage that acknowledges that the surroundings are the host for any economic and socio-political system. 相似文献
928.
The important role that non-motorised transport plays in urban sustainability is discussed with particular reference to the developing world and to the links between environmental and poverty issues. The significance of non-motorised transport in terms of reduced pollution, income maintenance for the poor and providing transport for vulnerable groups is stressed and placed within the general context of sustainable development. More specifically, evidence is presented for rickshaws in Calcutta, which demonstrates the vital role that non-motorised transport must play if sustainable development objectives are to be met. This evidence indicates that if rickshaws were to disappear from Calcutta's streets there would not only be significant increases in air pollution but also a substantial increase in the numbers of people living in poverty. 相似文献
929.
930.