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SUMMARY:Determination the pattern of spreading and accumulation of essenti
 al and trace elements at the benthic samples by using scanning micro-XRF-S
 R
DTSTART;VALUE=DATE-TIME:20200715T115000Z
DTEND;VALUE=DATE-TIME:20200715T121000Z
DTSTAMP;VALUE=DATE-TIME:20260313T105632Z
UID:indico-contribution-1845@indico.inp.nsk.su
DESCRIPTION:Speakers: Natalya Baturina (Novosibirsk State University)\nFor
  river ecosystems\, one of the site of chemical elements accumulation is b
 enthic assemblages. In our research 20 benthic samples were collected from
  small rivers and streams from industrial and nature areas of Novosibirsk 
 region. Benthic invertebrates were fixed at 75% ethanol and identified up 
 to the family taxonomical level at the laboratory. After identification sa
 mples were dried up to stable weight\, animals from each taxonomical group
  were placed at the conductive tape for further investigation.\nThe analys
 is was carried out using the µXRF-SR according to the standard certified 
 method at the experimental station "Elemental analysis" in the SCSTR (Budk
 er INP SB RAS). Experimental conditions: excitation energy 21 keV\, dimens
 ions of the exciting radiation beam 0.5 mm in height and 10 mm in width of
  the sample. Measuring time for one point was 100 s. The contents of more 
 than 20 elements\, including essential Cl\, K\, Ca\, Mn\, Fe\, and trace e
 lements Ti\, V\, Cr\, Ni\, Cu\, Zn\, As\, Rb\, Sr\, Y\, Zr\, Nb\, Mo\, Pb 
 were determined. The concentration range for essential elements was 150 - 
 10000 ppm\, for trace elements 0.3 – 1500 ppm.\nScanning was done in two
  directions – the length and width of the sample animal. The profile of 
 scanning was compared with photos from the electronic microscope. That gav
 e us an opportunity to find out a specific locus of accumulation of some e
 lements. Results obtained shown patchy spreading distribution of elements 
 in the samples\, that could be interpreted by various forms of chemical co
 mpounds\, which included explored elements. So\, some elements concentrati
 on could be determined as a part of the exoskeleton or outside contaminati
 on on the surface of an animal. For more complete result 3d scanning with 
 the function of focused X-ray optics could be used.\nAll obtained data wil
 l be applied for the determination of the role of benthic communities' mec
 hanisms of essential and trace elements accumulation in river ecosystems. 
 Moreover\, our data will be useful for the assessment of the ecological st
 atement of rivers and streams of industrial areas of Novosibirsk region.\n
 The work was carried out in the framework of the RFBR projects no. 19-05-5
 0046. The work was done at the shared research center SSTRC on the basis o
 f the VEPP-4-VEPP-2000 complex at BINP SB RAS\, using equipment supported 
 by project RFMEFI62119X0022.\n\nhttps://indico.inp.nsk.su/event/24/contrib
 utions/1845/
LOCATION:Zoom Zoom 860 5034 1820
URL:https://indico.inp.nsk.su/event/24/contributions/1845/
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