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Accueil du site → Doctorat → Pakistan → DETERMINATION OF SELENIUM SPECIATION OF SALINE LAKES FROM SOAN-SAKESAR VALLEY SALT RANGE PAKISTAN

University of the Punjab, Lahore (1998)

DETERMINATION OF SELENIUM SPECIATION OF SALINE LAKES FROM SOAN-SAKESAR VALLEY SALT RANGE PAKISTAN

Afzal, Shahzad

Titre : DETERMINATION OF SELENIUM SPECIATION OF SALINE LAKES FROM SOAN-SAKESAR VALLEY SALT RANGE PAKISTAN

Auteur : Afzal, Shahzad

Grade : Doctor of Philosophy (PhD) 1998

Résumé
Saline lakes are breeding and feeding habitat for many shorebirds and waterfowls from Soan-Sakesar Valley. Salt-Range, Pakistan. The selenium speciation studies were carried out on lake stream, spring and ground waters ; saturation extracts of soil (0-20 cm depth) ; and lake sediments (0-5 cm depth). The studies were started in March 1994 and completed in October 1996. The studies have shown elevated concentrations of selenium and a number of other inorganic constituents. In 1994 water samples were collected from Uchhali, Khabbaki and Jahlar lakes and analyzed for a variety of parameters such as : secchi disk transparency, chlorophyll-total phosphorus, nitrate, alkalinity, pH, total dissolved substances (TDS), calcium, magnesium, sodium, potassium chloride and sulfate. Chemical changes observed ill 1994 were compared to those or the study conducted by Institute of Geology Punjab University, in 1986. The three lakes studied can be characterized as hypereutrophic. Their Chemistry is controlled mainly by an evaporation-crystallization process and dissolved salts are supplied by underlying sedimentary submerged springs. Uchhali Lake is saline while Khabbaki and Jahlar lakes are brackish. Major ion chemistry of tile ground stream and spring studied for both drinking and irrigation. The effect or geology and hydrological conditions on the chemistry and quality of water have been discussed. Determination of NO3 can provide valuable diagnostic evidence or the extent

Université de soutenance : University of the Punjab, Lahore

Mots-clés : Saline Lakes, Soan-Sakesar Valley, Selenium, Trace Elements

Présentation (AGRIS)

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