Results 261 to 270 of about 429,250 (301)

Water-quality criteria for amphibians

2009
Abstract Most amphibian species spend portions or even their entire life cycle in water. Whether their habitats are streams, wetlands, vernal ponds, farm ponds, or larger bodies of water, amphibians are directly affected by several natural and anthropogenic chemical and physical characteristics.
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Water Quality Criteria for Nitrocellulose

1986
Abstract : Available data on macroinvertebrates, fish, and algae indicate nitrocellulose is not very toxic for most aquatic species. In most evaluations the EC50 and LC50 values were >1,000 mg/L. Only for the effect on chlorophyll a content of Selenastrum capricornutum was a lower value estimated, an EC50 of 579 mg/L.
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Water quality criteria research and progress

Science China Earth Sciences, 2012
Water quality criteria (WQC) are threshold limits for pollutants or other hazard factors in the ambient water environment, which are based on scientific experiments and extrapolations. Until now, there is limited information available regarding the study of water quality criteria in China.
ChengLian Feng, FengChang Wu, XiaoLi Zhao, HuiXian Li, Hong Chang   +4 more
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Deriving water quality criteria for trivalent and pentavalent arsenic

Science of The Total Environment, 2017
Arsenic (As) is a common trace element whose oxidation states mainly include four types (-3, 0, +3, and +5), and inorganic As(III) and As(V) are regarded as the most commonly existing forms in aqueous environments. Generally, As(III) has a higher toxicity than As(V) due to the different mechanisms in arsenic toxicity.
Lei, Zheng, Zhengtao, Liu, Zhenguang, Yan, Xianliang, Yi, Juan, Zhang, Yahui, Zhang, Xin, Zheng, Yan, Zhu   +7 more
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Progress Report on Water Quality Criteria

Journal AWWA, 1962
In this progress report, an outline is presented of the results of Committee 2225 M's subsequent work on the need for professional standards of water quality as presented at the 1960 Bal Harbor Conference. This progress report also outlines the characteristics of an “Ideal Quality Water.” The qualities are delineated on a level to meet the functional ...
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Water quality criteria for irrigation with highly saline water

1993
When considering the quality of a water for irrigation a fixed rating or evaluation is not possible. The recommended approach is to evaluate the water for the specific conditions at the locality where it is to be used. Factors to be considered include crops selected, soil type and water permeability, reactions of the soil with the water, climatic ...
D. L. Suarez, I. Lebron
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General Introduction to Water Quality Criteria

2015
Water quality standards (WQS) play an important role in management of water quality and aquatic ecosystems around the world, especially in China where the situation of water pollution is getting grimmer. The primitive WQS in China dated back to the early 1980s, and since then, it has become an integrative environment standard system after many ...
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Water Quality Criteria and Municipal Supplies

Journal AWWA, 1954
instituted the first systematic program of sanitary water analyses in 1887, and by the beginning of the twentieth centur such analyses were well established procedures. With the development of analytical methods designed to measure the sanitary characteristics of wat r, it was natural that quantitative limits should be applied in the interpretation of ...
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Problems in determining water quality criteria for freshwater fisheries

Proceedings of the Royal Society of London. Series B. Biological Sciences, 1972
Abstract Accurate water quality criteria are essential if fisheries are to be protected without unnecessary restrictions being imposed on the discharge of industrial and domestic effluents. There is a considerable literature on the effects of pollutants on fish, but even for the common poisons it is difficult to establish more than ...
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Water‐Quality Criteria — Industry's Stake in the Water Market

Journal AWWA, 1975
The following Joint Discussion took place during the 1973 AWWA Annual Conference in Las Vegas, Nev. The papers were presented as part of a session organized by the Indl. Wtr. T&P Com. on May 16. The purpose of the discussion was to air the views and elucidate the problems of industry with regard to water quality.
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