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Changes in mercury content in waters of the Narew River and some of its tributaries

100%

Grabinska B., Koc J.

Journal of Elementology

2007

tom 12

nr 4

269-279

Although some small amounts of mercury in surface water come from natural environment, much higher quantities originate from anthropogenic sources, including industry and agriculture. Mercury readily accumulates in bottom sediments, from which it can return to water, which can be a serious cause of mercury pollution even after other mercury sources are removed from a river’s drainage basin. Concentration of mercury was examined in river waters flowing from basins characterised by different land use and population density. Samples of water were collected from two right tributaries of the Narew River, called the Pisa and the Biebrza, and at six sites in the middle section of the main river. The areas drained by these three rivers lie within the ecosystem known as the Green Lungs of Poland. It was found that the average mercury concentration in the waters of the Narew and its tributaries ranged between 0.3 and 0.9 pg dm-3, being only slightly higher than the concentrations typical of unpolluted territories. The highest mercury content occurred in spring and in the waters from agricultural-forested basins with large towns. Changes in the mercury outflow were associated with accumulation of household pollutants downstream, atmospheric conditions as well as the content of organic matter and suspended solids in the river waters. Low concentration of mineral suspension and organic substance carried by the Pisa River significantly depressed the mercury content in the water of this river. In the Biebrza River, the concentration of both organic and mineral substance was directly proportional to the content of mercury.

Monitoring the environment of agricultural basins by means of computer programmes

80%

Paszczyk J.

International Agrophysics

1998

tom 12

nr 4

Ograniczanie wyników

1 International Agrophysics

1 Journal of Elementology

1 Grabinska B.

1 Koc J.

1 Paszczyk J.

1 2007

1 1998

Wyniki wyszukiwania

Changes in mercury content in waters of the Narew River and some of its tributaries

Monitoring the environment of agricultural basins by means of computer programmes