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UID:pretalx-flowpath-2025-F8ZTXG@talks.staging.osgeo.org
DTSTART;TZID=CET:20250612T170000
DTEND;TZID=CET:20250612T171000
DESCRIPTION:Groundwater environmental objectives in Europe are defined by t
 he Water Framework Directive (2000/60/EC) and the Groundwater Directive (2
 006/118/EC)\, based on contaminant thresholds and considering Natural Back
 ground Levels (NBL) when appropriate. NBL represents the boundary between 
 natural processes and anthropic impact\, and defines the targets for remed
 iation in polluted sites.\nThe Sacco River Basin (1530 km²\, Latium\, Ita
 ly) includes a contaminated “Site of National Interest”\, 72.35 km² w
 ide. Anthropic pressures are widespread within the basin (e.g. industrial 
 sites\, transport infrastructures\, landfills). Geogenic arsenic (As)\, ir
 on (Fe)\, and manganese (Mn) can be mobilized in anoxic conditions into gr
 oundwater by biogeochemical processes.\nThis research aims to define the N
 BL for As\, Fe\, and Mn in the different lithologies (alluvial deposits\, 
 volcanic rocks\, travertines) using a multidisciplinary approach. The curr
 ently ongoing groundwater sampling targets the low-impact areas to get a s
 et of concentration values associable exclusively to geogenic processes. G
 roundwater levels\, chemical-physical parameters\, inorganics\, dissolved 
 organic carbon\, isotopes (δ18O\, δ2H\, δ13C\, and 87Sr/86Sr)\, and mic
 robial properties were analyzed. \nPreliminary results show that the highe
 st Fe (201-1988 μg/L)\, As (38-55 μg/L)\, and Mn (55-406 μg/L) levels a
 re related to reducing conditions in peat-rich alluvial sediments and\, to
  a minor extent\, to volcanic formations. Cell abundance is in the range o
 f 10^3-10^4 cells/mL with predominance of cells with low nucleic acid cont
 ent\, as reported in oligotrophic environments. Furthermore\, microbial re
 spiration suggests higher metabolism and functional diversity of microbial
  communities in the alluvial facies. Our findings contribute to a more acc
 urate assessment of natural versus anthropogenic influences\, ultimately s
 upporting the development of effective groundwater management and remediat
 ion strategies in contaminated sites.
DTSTAMP:20260428T165437Z
LOCATION:Room R3
SUMMARY:Natural geochemical background levels in groundwater of large-scale
  contaminated sites - Andrea Cisternino
URL:https://talks.staging.osgeo.org/flowpath-2025/talk/F8ZTXG/
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