Raziskave mobilnosti kovin v solinskem blatu iz Sečoveljskih solin

magistrsko delo

Teja Ramšak (Author), Nastja Rogan (Mentor), Nives Kovač (Co-mentor)

Abstract

Sečoveljske soline so v svetovnem merilu edinstvene. Z aktivno pridelavo soli na petoli veljajo za območje, kjer je bilo izvedeno veliko raziskav flore in favne, le malo raziskav pa je bilo namenjeno študiju in aplikativni uporabi solinskega blata. V splošnem imajo vzorci solinskega blata (iz različnih lokacij/vzorčnih mest) zelo podobno mineralno in geokemično sestavo, kar nakazuje na širšo potencialno možnost zajema solinskega blata kot vhodne surovine za balneoterapevtske namene. Za razumevanje celotnega sistema ionske izmenjave med tekočo in trdno fazo smo v magistrskem delu raziskali variabilnosti elementne sestave solinskega blata, slanice in porne vode blata, ki predstavljajo pomembne lastnosti za terapevtsko uporabo peloidov. Pri tem imajo seveda glavno vlogo težke kovine in polkovine ter sledne prvine, ki so prisotne v solinskem blatu in slanici ter imajo zmožnost njihovega izluževanja pri uporabi blata za balneoterapevtske oz. peloterapevske namene. Rezultati so pokazali, da slanost in zorenje blata ne vplivata na mineralno sestavo trdne faze. Vplivata na mobilnost kovin, saj se pri najvišji slanosti slanice (27,5 Bé=27,2 S %), ki jo dosežejo Sečoveljske soline v poletni sezoni, vsebnost težkih kovin in polkovin ter sledne prvine v solinskem blatu zmanjšajo in zato povečajo v vodni fazi. Cr v trdni fazi iz 112 mg kg-1 pade na 93 mg kg-1 ob koncu eksperimenta (tk), prav tako Ni iz 77,3 mg kg-1 pade na 68,3 mg kg-1 ob tk. Izračunani faktor obogatitve (EF) je bil pri elementih Ba, Mn in Sr pod vrednostjo 1, kar pomeni, da solinsko blato ni obogateno s temi tremi elementi. Pri elementih As, Co, Cr, Cu, Ni, Pb, Zn so bile vrednosti faktorja obogatitve povsod nižje od 3, kar pomeni, da ima solinsko blato manjšo obogatitev z navedenimi elementi.

Keywords

Sečovljske soline;mobilnost težkih kovin;solinsko blato;slanica;laboratorijski eksperiment;

Data

Language:	Slovenian
Year of publishing:	2017
Typology:	2.09 - Master's Thesis
Organization:	UL NTF - Faculty of Natural Sciences and Engineering
Publisher:	[T. Ramšak]
UDC:	55
COBISS:	1358430
Views:	1055
Downloads:	645
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	metal mobility research in saline mud from Sečovlje salina
Secondary abstract:	Sečovlje Salina is in worldwide unique places. Saline sediment (saline healing mud or “fango”) from the Sečovlje Salina is traditionally used in the coastal health resorts as a virgin material for medical treatment, wellness and relax purposes. Therapeutic qualities of the healing mud depends on its mineralogical composition and physical, mineralogical, geochemical and biological properties. Their microbial and potentially toxic elements contamination are the most important features affecting user safety. However, the degree of metal toxicity (and its regulation) for natural healing mud is still under discussion. Therefore, the influence of the overlying water salinity on the mobility of heavy metals (and some other geochemical characteristics) was studied for saline sediment of the Sečovlje Salina. Experiments takes place in eight tanks under defined conditions i.e. at day (21 °C): night (16 °C) cycle for three months. Sediment, sampled in Sečovlje Salina, was covered with water of different salinities and mixed/stirred every week during the experimental period. Salinity and maturation of sediment does not significantly affect its mineral composition. In the water phase, concentrations of most elements (As, Ba, Cu, Mo, Mn, Ni, Sr, Sb) rise from the beginning to the end of the experiment, whereas the heavy metals (potentially toxic elements) decreasing trend in sediment was observed at that time. Enrichment factor (EF) was under 1 value for Ba, Sr, Mn, which means that the salt mud is not enriched with stated elements. Elements Co, Cr, Cu, Ni, Pb, Zn had EF value under 3, which means that sediments have small enrichment with these elements.
Secondary keywords:	Sečovlje Salina;elements mobility;saline sediment;brine;laboratory experiment;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za geologijo
Pages:	XIV, 73 f.
ID:	10910860