Results 261 to 270 of about 342,000 (294)

Bio-indicators and chemical pollution of surface waters

Environmental Monitoring and Assessment, 1983
Attention is given to two different approaches to determine the water quality in relation to toxic stress.The first approach is based on direct observations on the state of health of the biota naturally occurring in the environment to be judged. In the original concept of biological indicators of water pollution the existence of differences in stress ...
W. Slooff, Dick de Zwart
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CHEMICAL POLLUTION OF THE ENVIRONMENT WATER SOURCES AND HEALTH

Environmental Engineering and Management Journal, 2004
The progress of civilization as a whole (urbanization, demographical explosion and massive concentration of humans in towns and cities, vertiginous industrialization, the intense development of the motorized traffic, the chemical substances used in agriculture and even in the domestic economy etc.) has profoundly altered the living environment of human
Diana Diaconu, Manuela Gheorghes, Tinca Navrotescu   +2 more
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Water, Endangered Ecosystem: Assessment of Chemical Pollution [PDF]

Journal of Environmental Engineering, 1992
The pervasive nature of water and its accessibility to mankind leave it open to a variety of civilization-induced changes ranging from diversion of water flows to heavy-metals pollution. The abuses of the last 100 years have led to problems with water quality and quantity.
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Chemical Pollution of Ground Waters

Journal AWWA, 1974
As ground waters are increasingly used for water sources, contamination of ground water has become a problem in some areas. Among the contaminants are pesticides, trace elements, and nitrate—nitrogen. These contaminants are now being studied, and ways are being found to prevent or rectify their intrusion.
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Water Pollution and Chemical Contamination in Drinking Water

1992
An ample supply of clean fresh water is essential for the well-being of all organisms. The quality of drinking water, often taken for granted in industrialized nations, is increasingly becoming a matter of concern. The original focus of most water quality improvement programs was on such conventional pollutants as dissolved oxygen, fecal coliform ...
William A. Coniglio, Joseph A. Cotruvo, Paul S. Berger   +2 more
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Water Treatment Chemicals for Pollution Minimization and Management

2020
Water is vital for sustenance of life and smooth living. The reliable and safe supply of water is a prime necessity of the most important determinants of human health. The treatment of water is essential to remove contaminants and undesirable components and reduce their concentration to make water fit for its desired end use.
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Chemical Engineering Aspects of Water Pollution Control

1973
In this paper the importance of a study of water treatment processes based on the principles of classical chemical engineering is stressed. Biological reaction engineering plays an increasing role in defining new necessary unit operations. The importance of inplant measures to prevent pollution rather than abate it is pointed out.
Appio C. di Pinto, Roberto Passino
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Chemical Water Pollution and Human Health

2017
Human activities associated with environmental degradation are threatening urban and rural water supplies throughout the world. Although water quality in the United States surpasses that in most of the world, increasing challenges from an aging infrastructure, poorly controlled disposal of pharmaceuticals, household chemical products, and biologically ...
Christopher P. Weis, Donald E. Tillitt
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Smartphone-Based Device for Monitoring Chemical Pollutants in Water

Volume 3: Biomedical and Biotechnology Engineering, 2018
There remains a need for a cost-effective, sensitive and on-site analytical technique which requires minimal technical skills for monitoring chemical contaminants in water. This research work presents a smartphone-based colorimetric detection of trace chemical pollutants in water.
Justus C. Ndukaife, Samuel Ozeh, A. G. Agwu Nnanna   +2 more
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Effects of water pollutants and other chemicals on fish acetylcholinesterase (in vitro)

Environmental Research, 1980
Acetylcholinesterase (AChE) preparations from the muscle of the fathead minnow (Pimephales promelas Rafinesque) were treated (in vitro) with 74 chemicals of various classes, many of which are environmental contaminants, to determine their effect upon enzyme activity.
G.M. Christensen, D.L. Olson
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