Dzīvsudraba koncentrācijas mērīšana ūdenī un ezera nogulsnēs, izmantojot Zēmana atomu absorbcijas spektroskopiju
Date
2011
Authors
Ābola, Anda
Journal Title
Journal ISSN
Volume Title
Publisher
Latvijas Universitāte
Abstract
Maģistra darbs ir veltīts dzīvsudraba koncentrācijas mērījumiem ūdenī un ezera nogulsnēs.
Dzīvsudraba koncentrācijas tika noteiktas vairākos Latvijas upju un ezeru ūdeņu paraugos. Lielākajā daļā paraugu noteiktā Hg koncentrācija bija zem iekārtas jūtības sliekšņa, izņemot 6 paraugus, kuros tā bija robežās no 0,5 līdz 2 ng/l. Šie rezultāti labi parāda Latvijas dabas ūdeņu Hg fonu.
Līdztekus tika veikti Hg koncentrācijas mērījumi ūdens paraugos no vairākām ūdens attīrīšanas vietām. Šajos paraugos Hg netika konstatēts.
Šī darba ietvaros tika veikti mērījumi Engures ezera nogulšņu paraugos, nosakot Hg koncentrāciju vertikālo sadalījumu. Rezultāti parādīja, ka kopumā dzīvsudraba koncentrācijas ir nelielas un nepārsniedz 80 ng/g. Hg koncentrāciju palielinājums nogulšņu jaunākajos slāņos ir saistāms ar industrializācijas sākumu.
Master thesis are devoted to mercury concentration measurements in water and lake sediments. Mercury concentrations were determined in several Latvian river and lake water samples. For most of the samples determined Hg concentration was below the instrument sensitivity threshold, only in 6 samples it was above 0,5 ng/l. These values illustrate Hg background level in natural waters of Latvia. Hg concentrations were measured in samples from several water treatment sites, as well. Hg in these samples was not detected. In the framework of this work, Hg vertical distribution profile in sediments from Engures lake was determined. The results showed that total mercury concentrations do not exceed 80 ng/g. Mercury concentration increase in youngest layers of sediments is related to the beginning of industrialization.
Master thesis are devoted to mercury concentration measurements in water and lake sediments. Mercury concentrations were determined in several Latvian river and lake water samples. For most of the samples determined Hg concentration was below the instrument sensitivity threshold, only in 6 samples it was above 0,5 ng/l. These values illustrate Hg background level in natural waters of Latvia. Hg concentrations were measured in samples from several water treatment sites, as well. Hg in these samples was not detected. In the framework of this work, Hg vertical distribution profile in sediments from Engures lake was determined. The results showed that total mercury concentrations do not exceed 80 ng/g. Mercury concentration increase in youngest layers of sediments is related to the beginning of industrialization.
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