Naslov
Hydrochemical and geochemical research of Bistrac spring (Croatia)

Autori
Buzjak, Nenad ; Maldini, Krešimir ; Tomas, Damir ; Milović, Simana ; Matić, Natalija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
21th International Karstological School Guide book & Abstracts / Otoničar, Bojan ; Gostničar, Petra ; Gabrovšek, Franci - Postojna : Inštitut za raziskovanje krasa ZRC SAZU, 2013, 80-80

Skup
21th International Karstological School

Mjesto i datum
Postojna, Slovenija, 10.06.2013. - 14.06.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
karst spring; trace elements; water quality; sediment

Sažetak
Bistrac karst spring is located in Samobor karst area in NE part of Samoborsko gorje hills (NW Croatia). It is a Vauclusian spring type in a karst system developed in Neogene limestone beds overlying less permeable Triassic beds. Due to the intense urbanization the whole area is under strong anthropogenic pressure resulting in nature degradation. Since it is unique for this part of Croatia, due to its geomorphological and ecological importance Bistrac spring and upper part of its valley is planned to be protected as a geomorphosite. Therefore geomorphological, hydrochemical and geochemical research are in progress to determine its characteristics and vulnerability. Concentrations of 21 elements, dissolved organic carbon, nutrients and ions, mineral oil, physical and chemical indicators were measured in water samples. Their concentrations were low - more than few orders of magnitude less than allowed by the Croatian regulations EQS for Inland surface water (environmental quality standard). According to concentrations of anions and cations dissolved in water it is classified as Ca-HCO3 type of water. Higher amount of Ca2+ (>70%) and lesser amount of Mg2+ (<30%) showing that water is under the higher influence of carbonate hinterland (limestones). Water from Jazbinščak stream that is connected with Bistrac has somehow higher amount of sodium, potassium and chloride. The mass fractions of 21 elements were determined in representative spring sediment by ICP MS. Sediment samples were also investigated using standard sieves 125 µm and 63 µm diameter. Highest concentrations of some metals in sediments are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Geografija

POVEZANOST RADA