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EC number: 295-518-9
CAS number: 92062-05-0
A complex combination of hydrocarbons obtained from the vacuum distillation of the products from a thermal cracking process. It consists predominantly of hydrocarbons having carbon numbers predominantly greater than C34 and boiling above approximately 495°C (923°F).
Since the main
applications of bitumen/asphalt is in the coating of surfaces, e.g. of
roads, roofs, linings of water basins and pipes there are concerns that
frequent contact with water will lead to the leaching of constituents
from the bitumen/asphalt into the environment. To assess whether this
was a significant concern Brandt and De Groot undertook a series of
static and dynamic leaching tests to study the leaching behaviour of
PAHs present in a number of bitumens as shown in Table below.
Description of samples
assessed in PAH leaching studies by Brandt and De Groot
Description of bitumen/asphalt
Conventional Heavy Venezuelan penetration bitumen
Straight run vacuum residue oforigin
Deeply vacuum flashed conversion residue from a thermal cracker ex D
Conventionally blown roofing bitumen ex D
Conventionally blown roofing bitumen oforigin
Blown roofing bitumen of middle east origin
The concentrations of
PAHs in the bitumens and the leachates in the study by Brandt and De
Groot have been summarised in the Table below. These data (normalised to
µg/kg and µg/L) show that even though some individual PAHs are present
in. mg/kg amounts in the bitumen, the plateau concentrations in the
leachate are several orders of magnitude lower than would be anticipated
on the basis of their water solubility alone. Furthermore, Brandt and De
Groot determined that the equilibrium PAH concentrations in the leach
water from bitumens see Table below were significantly below the surface
water limits that exist in several European countries and were also more
than an order of magnitude lower than the existing EU limits for potable
water. For example, The benzo(a)pyrene concentrations determined in the
leach water ranged from <0.015 to 0.3 ng/L compared to the limit of 10
ng/L stipulated by the EU drinking water Directive. As such their
results indicate that leaching of PAHs from bitumens does not pose any
significant risks to health or the environment.
PAH concentrations in
bitumen vs plateau concentrations obtained in Brandt and De Groot
concentrations reached in static leach test, calculated from the
concentrations in the samples taken after 9, 16, 36 and 64 days. Data
from Brandt and De Groot - See Table above for description of samples
assessed in their study
Plateau concentrations (ng/L) obtained in static leaching test for bitumens
Detection limit (ng/L)
Notes + = below the
limit of detection.
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