magistrsko delo
Povzetek
Za preučevanje smo izbrali tla otroškega igrišča, ki so bila onesnažena s
svincem. Povprečna koncentracija Pb v tleh na globini 0 – 20 cm je bila 516
mg/kg. Posamezni točkovni vzorci so presegali koncentracijo 10 000 mg/kg.
Zanimalo nas je kaj je izvor onesnaženja ter kakšne bi lahko bile posledice za
zdravje otrok. Iz talnih profilov ter neenakomernih koncentracij Pb v
horizontalni in vertikalni smeri je bilo razvidno, da onesnaženje ni posledica
imisij iz zraka (promet, industrija), temveč je bila zemljina pomešana z ostanki
gradbenega materiala ter ostanki avtomobilskih akumulatorjev. Izvedli smo
osnovne pedološke analize: vsebnost karbonatov, kislost tal, teksturni razred,
vsebnost organske snovi, kationsko izmenjalno kapaciteto ter dostopnost
fosforja. Z metodo sekvenčnih ekstrakcij po Tessierju smo ugotovili, da je
največji delež svinca vezan na organsko snov (od 30,61 % do 67,48 %) ter
karbonate (od 12,22 % do 62,86 %). Biodostopnost svinca smo določali z in
vitro metodo, ki jo je določila U.S. EPA. Absolutna biodostopnost je bila med
25,18 in 56,92 %. Z modelom IEUBK, smo želeli napovedati koncentracijo
svinca v krvi otrok, nato pa smo rezultat primerjali z izmerjeno koncentracijo Pb
v krvi otrok. Napovedana ter izmerjena koncentracija se nista ujemali. Eden od
razlogov je lahko točkovna, neenakomerna onesnaženost, pri čemer smo za
analize izbrali vzorce z visoko koncentracijo Pb. Predvidevamo tudi, da je bil
zaradi zatravljenosti onesnaženega dela igrišča stik otrok s tlemi zmanjšan.
Ključne besede
biodostopnost;onesnaženost tal;svinec;sekvenčna ekstrakcija;in vitro;IEUBK;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2017 |
Tipologija: |
2.09 - Magistrsko delo |
Organizacija: |
UL BF - Biotehniška fakulteta |
Založnik: |
[A. Ivanović] |
UDK: |
631.453:504.5:546.81(043.2) |
COBISS: |
8758393
|
Št. ogledov: |
1036 |
Št. prenosov: |
785 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Fractionation and bioavailability of Pb contaminated soil at childrenʹs playground |
Sekundarni povzetek: |
For the study we chose the soil from the playground, which was contaminated
with lead. Average Pb concentration in soil at the depth of 0 – 20 cm was 516
mg/kg. Some point samples exceeded concentration of 10 000 mg/kg. The aim
was to identify the source of contamination and the negative effects on children's
health. From the soil profiles and the heterogeneous concentration of Pb in the
horizontal and vertical direction, was evident, that the contamination is not a
result of immissions from air, but the result of the soil mixing with the remains
of building materials, and residues of car batteries. We carried out the basic soil
analysis: content of carbonates, soil acidity, texture class, the organic matter
content, the cation exchange capacity, and the availability of phosphorus. The
method of sequential extractions, according to Tessier, showed that the largest
proportion of lead is bonded to the organic substance (from 30.61 % to 67.48 %)
and carbonates (from 12.22 % to 62.86 %). Bioavailability of lead was
determined by the in vitro method, established by the U.S. EPA. The absolute
bioavailability was between 25.18 and 56.92%. With the IEUBK model, we
wanted to predict the PbB concentration, and then compare the results to the
measured concentration of Pb in the blood of children. The predicted and
measured concentrations do not match, since the pollution was uneven and we
chose samples with high concentration of Pb for our analysis. We assume that
the intake of lead was minimized since contaminated part of playground was
covered with grass. |
Sekundarne ključne besede: |
bioaccessability;soil contamination;lead;sequential extraction;in vitro; |
Vrsta dela (COBISS): |
Magistrsko delo/naloga |
Študijski program: |
0 |
Konec prepovedi (OpenAIRE): |
1970-01-01 |
Komentar na gradivo: |
Univ. v Ljubljani, Biotehniška fak., Oddelek za agronomijo |
Strani: |
IX, 44 f., [2] f. pril. |
ID: |
10850558 |