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    <ns1:identifier>o:8409</ns1:identifier>
    <ns1:title language="sr">Novi pristup u ispitivanju mobilnosti metala i metaloida u sedimentima primenom sekvencijalne ekstrakcije </ns1:title>
    <ns2:subtitle language="sr">doktorska disertacija</ns2:subtitle>
    <ns2:alt_title language="en">A new approach to study the mobility of metals and metalloids in sediments using sequential extraction : doctoral disserttion</ns2:alt_title>
    <ns1:language>sr</ns1:language>
    <ns1:description language="sr">Cilj ove doktorske disertacije je određivanje sadržaja metala i metaloida u uzorcima sedimenata i
muljeva iz otpadnog kanala industrijske zone Pančeva i okoline, ustanovljavanje njihovih
asocijacija sa različitim supstratima, procena potencijalne mobilnosti ispitivanih elemenata u
uslovima koji vladaju u ispitivanoj sredini, kao i identifikacija eventualnog antropogenog
zagađenja, korišćenjem metode standardizovane sekvencijalne ekstracije. Primenjene su tri
tehnike ekstrahovanja za prva tri koraka standardizovane BCR sekvencijalne ekstrakcije i to:
mućkanje uzoraka na rotacionoj mućkalici u trajanju od šesnaest sati u okviru konvencionalne
sekvencijalne ekstrakcije (KSE); dvominutno izlaganje uzoraka mikrotalasima snage 90 W u
okviru mikrotalasne sekvencijalne ekstrakcije (MTSE); i tridesetominutno izlaganje uzoraka
ultrazvučnim talasima u okviru ultrazvučne sekvencijalne ekstrakcije (UZSE). Četvrti korak u
primeni sve tri tehnike je bio isti, kuvanje uzoraka sa carskom vodom na vodenom kupatilu.
Tačnost i preciznost sve tri primenjene tehnike ekstrahovanja je utvrđen pomoću referentnog
materijala, BCR 701. Pored sekvencijalne ekstrakcije, uzorci su rastvarani u mikrotalasnom
digestoru pomoću carske vode i carske vode sa HF. Nakon svih primenjenih ekstrakcionih
koraka, u rastvorima je određivan sadržaj Al, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb,
Si, Sn, Sr, V, Ti, Zn, As, Se i Hg metodom induktivno spregnute plazme sa optičkom emisionom
spektrometrijom (ICP/OES). Računanjem osnovnih (baseline) geohemijskih koncentracija i
primenom multivarijantnih statističkih metoda, određeni su antropogeno poreklo elemenata i/ili
kvantifikovan njihov antropogeni udeo, kao mogući izvori zagađivanja na ovim lokalitetu.
Poređenje rezultata ekstrakcije sertifikovanog materijala, dobijenih različitim tehnikama,
pokazalo je da je KSE najpreciznija metoda dok se primenom ultrazvučne sekvencijalne
ekstrakcija (UZSE) dobijaju zadovoljavajuće tačnosti za polovinu sertifikovanih metala u prvom
i trećem koraku BCR ekstrakcije, za razliku od MTSE koja daje najnepreciznije rezultate.
Na osnovu procentualne zastupljenosti ekstrahovanih koncentracija elemenata nakon prve faze
BCR ekstrakcije, može se konstatovati da, na osnovu ekstrahovanih koncentracija Cd, Cu i Zn uzorci sedimenata uzeti sa lokaliteta Dekantera imaju povišen i visok rizik po životnu sredinu,
dok, na osnovu koncentracija esktrahovanih Ba, Cd, Cu, Zn i Se, sedimenti sa lokaliteta
Elektrolize imaju nizak i srednji rizik po životnu sredinu...</ns1:description>
    <ns1:description language="en">The  goal  of  this  dissertation  is  to  determine  the  c
ontent  of  heavy  metals  and  metalloids,  in 
sediments  and  mud  samples  from  the  waste  canals  of 
the  industrial  zone  of  Pan
č
evo  and  its 
surroundings,  to  establish  their  associations  with 
different  substrates,  the  evaluation  examined 
the potential mobility of elements in the condition
s prevailing in the environment of investigated 
study,   and   the   identification   of   possible   anthropog
enic   pollution   using   the   method   of 
standardized sequential extraction. We used three t
echniques to extract the first three steps of the 
standardized  BCR  sequential  extraction  as  follows: 
sample  agitation  on  a  rotary  shaker  for  a 
period of sixteen hours in the conventional sequent
ial extraction (CSE), two-minute exposure of 
microwaves  under  90  W  in  the  microwave  sequential  e
xtraction  (MWSE),  and  thirty-minute 
exposure of ultrasound waves in the ultrasonic sequ
ential extraction (USSE). The fourth step for 
all  three  techniques  was  the  same,  digestion  of  sam
ples  with 
aqua  regia
  on  a  water  bath. 
Accuracy  and  precision  of  the  three  extraction  tech
niques  were  determined  with  the  reference 
material,  BCR  701.  In  addition  to  sequential  extrac
tion,  samples  were  digested  in  a  microwave 
digestor with 
aqua regia
 and 
aqua regia
 with HF. In extracts, the content of Al, Ba, Ca, C
d, Co, 
Cr,  Cu,  Fe,  K,  Mg,  Mn,  Na,  Ni,  Pb,  Si,  Sn,  Sr,  V,  T
i,  Zn,  As,  Se  and  Hg  were  determined  by 
inductively  coupled  plasma  with  optical  emission  sp
ectrometry  (ICP/OES).  After  chemical 
analysis of sediments and mud samples, based on the
 calculation of basic (
baseline
) geochemical 
concentrations  and  application  of  multivariate  stat
istical  methods,  we  defined  anthropogenic 
origin  of  elements  and  quantify  their  anthropogenic
  share,  as  well  as  the  possible  sources  of 
contamination at investigated sites. Comparing the 
results of the extraction of certified material, 
obtained by different techniques, showed that the m
ost accurate technique is CSE, while after the 
ultrasonic  extraction  (USSE)  satisfactory  accuracy 
were  obtained  for  half  of  certified  metals  in 
the first and third step of BCR extraction, unlike 
MWSE which gives less accurate results.  
Based on the percentage of the extracted elements c
oncentrations after the first phase of the BCR 
extraction,  it  can  be  concluded  that  based  on  the  e
xtracted  concentrations  of  Cd,  Cu  and  Zn, 
sediment  samples  taken  from  the  site  Decanter  are  h
aving  an  increased  and  a  high  risk  to  the environment,  while  sediments  from  Electrolysis  are 
having  a  low  to  medium  risk  based  on 
concentrations  of  Ba,  Cd,  Cu,  Zn...</ns1:description>
    <ns1:description language="sr">Hemija - Hemija životne sredine / Chemistry- Environmental Chemistry
Datum odbrane : 28.12.2012</ns1:description>
    <ns1:keyword language="sr">metali i metaloidi; sedimenti i muljevi; sertifikovani materijal (BCR 701);konvencionalna, mikrotalasna i ultrazvučna standardizovana BCR sekvencijalna ekstrakcija;mikrotalasna digestija</ns1:keyword>
    <ns1:keyword language="en">metals and metalloids, sediment and mud samples, certificate material (BCR701); conventional, microwave, ultrasound standardized BCR sequential extraction; microwavedigestion</ns1:keyword>
    <ns1:keyword language="sr">504</ns1:keyword>
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    <ns1:status>45</ns1:status>
    <ns2:peer_reviewed>no</ns2:peer_reviewed>
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      <ns1:ext_role>mentor</ns1:ext_role>
      <ns1:entity seq="0">
        <ns3:firstname> Dubravka J., 1974- </ns3:firstname>
        <ns3:lastname>Relić</ns3:lastname>
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        <ns3:firstname> Aleksandar R., 1971- </ns3:firstname>
        <ns3:lastname>Popović</ns3:lastname>
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        <ns3:firstname> Dragana</ns3:firstname>
        <ns3:lastname>Đorđević</ns3:lastname>
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      <ns1:ext_role>član komisije</ns1:ext_role>
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        <ns3:firstname> Goran, 1964- </ns3:firstname>
        <ns3:lastname>Roglić</ns3:lastname>
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      <ns1:ext_role>član komisije</ns1:ext_role>
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        <ns3:firstname> Antonije</ns3:firstname>
        <ns3:lastname>Onjia</ns3:lastname>
      </ns1:entity>
      <ns1:date>2012</ns1:date>
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    <ns7:description language="sr">Hemija - Hemija životne sredine / Chemistry- Environmental Chemistry</ns7:description>
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