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Results for “WATER POLLUTION”

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At least 289 records · Page 16Linked to original sources
PubMed2001

Cadmium and lead levels in fish (Tilapia nilotica) tissues as biological indicator for lake water pollution.

Cadmium and lead were determined in different tissues (muscle, gill, stomach, intestine. liver, vertebral column and scales) of Tilapia nilotica from the High Dam Lake, Aswan (Egypt) to assess the lake water pollution with those toxic metals. Fish samples were chosen from different ages and weights to be analyzed along with samples of the aquatic plant (Najas armeta), sediment and lake water. The results showed that cadmium and lead concentrations were higher in fish scales and vertebral column than in the other parts of the fish. Cadmium and lead levels in High Dam lake water and fish (Tilapia nilotica) were a result of the pollution which uptakes from aquatic plants, sediments and gasoline containing lead that leaks from fishery boats. Tilapia nilotica fish was used as a good bio-assay indicator for the lake pollution with cadmium and lead. The fish muscles in this study were in the safety baseline levels for man consumption.

Animals↗
PubMed2002

Algal growth inhibition by river water pollutants in the agricultural area around Lake Biwa, Japan.

An ecotoxicological study of river water discharged from the agricultural area around Lake Biwa was performed by using algal bioassays to guide chemical analysis. Water samples were collected once a week, at least, for 1 year starting in April 1997 and continuing until April 1998. The toxicities of the dissolved and particulate-adsorbed extracts of water samples were evaluated by the algal growth inhibition test and concentrations of individual pesticides were determined. Most of the river water that was collected during the periods when pesticides were applied to the paddy fields caused algal growth inhibition. Some extracts were found to contain herbicides (molinate, mefenacet, simetryn, or esprocarb) as major compounds. According to chemical assay and bioassay, simetryn was identified as the most toxic compound that caused algal growth inhibition.

Agriculture↗
PubMed1997

Acetochlor-a comparative study on parameters governing the potential for water pollution.

The leaching behaviour of the herbicide acetochlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(ethoxymethyl)acetamide] was determined as compared with two congener compounds, alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide] and metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamid e]. The leaching profiles of the herbicides in columns with different types of soil and their capacity factors in reverse phase HPLC were compared. An approach for preliminary characteristic of the potential for water pollution of acetochlor is presented. The herbicide is classified as a leacher in soil and its potential for contamination of ground water is comparable with those of alachlor and metolachlor.

Acetamides↗
PubMed1991

[Injuries to chemical sense organs of fish due to sublethal levels of water pollution].

Histopathological investigations of taste organs of loaches (Noemacheilus barbatulus, L.) taken from creeks with differing grades of pollution demonstrate variable degrees of damage to taste bud structures. The degree of cell and tissue alteration (including sensory cells) is obviously directly correlated to the level and effective duration of the type of water pollutant. Based on the appearance of taste bud damage due to sublethal grades and qualities of pollution, the gustatory organs of fish may well be suited as a monitoring system for toxic substances in their environments.

Animals↗