title: Conifer needles as passive biomonitors of the spatial and temporal distribution of DDT from a point source.
abstract: Needles of two conifer species, Picea abies and Pinus nigra, were used as passive samplers for monitoring air contamination by sampling at increasing distances from a suspected point source of DDT. Needle concentrations declined with increasing distance downwind of the point source allowing to identify spatial and temporal trends of accumulation. This suggested that conifer needles are effective biomonitors of contamination levels in areas characterized by the presence of semi-volatile substances. Differences in uptake were apparent between the species. Needle morphology and structure were studied with scanning electron microscope (SEM) as were dimensional parameters (surface area, volume). The results suggest that the concentrations depend on a mechanism involving the inner structure of the needles, specifically the number and accessibility of resin channels rather than their surface area. Pine needles have more channels with greater accessibility than spruce. The results suggest that spruce is more suitable for short term measurement while pine for determining long term cumulative exposure.
authors.affiliation: Department of Structural and Functional Biology (DBSF), University of Insubria, Via J.H. Dunant 3, 21100 Varese, Italy. antonio.diguardo@uninsubria.it
authors.forename: Antonio
authors.initials: A
authors.lastname: Di Guardo
authors.forename: Serena
authors.initials: S
authors.lastname: Zaccara
authors.forename: Bruno
authors.initials: B
authors.lastname: Cerabolini
authors.forename: Maurizio
authors.initials: M
authors.lastname: Acciarri
authors.forename: Giorgio
authors.initials: G
authors.lastname: Terzaghi
authors.forename: Davide
authors.initials: D
authors.lastname: Calamari
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000493:pharmacokinetics; D003634:DDT / Q000032:analysis* / Q000493:pharmacokinetics; D004784:Environmental Monitoring / Q000379:methods*; D007536:Isomerism; D008855:Microscopy, Electron, Scanning; D028222:Picea / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D028223:Pinus / Q000737:chemistry / Q000187:drug effects / Q000378:metabolism*; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D012989:Soil Pollutants / Q000032:analysis; D013045:Species Specificity; D013997:Time Factors; D014018:Tissue Distribution
chemical_list: D000393:Air Pollutants; D012989:Soil Pollutants; D003634:DDT