Naphthalene, C1 - National Park Service

account for about 20% of the loss of 1-methylnaphthalene and 30% of
the loss of naphthalene; volatilization was not an important loss
mechanism for the other compounds. Lower molecular weight
compounds may also volatilize from sediments; this process is not
significant for the higher molecular weight compounds [788].
Environmental Fate [366]:
TERRESTRIAL FATE: Data regarding the biodegradation of 1methylnaphthalene
in soil were not available. However,
based upon aqueous screening test data and die-away tests
for ground and marine water, 1-methylnaphthalene should
biodegrade rapidly in soils acclimated to PAHs and at a
moderate rate in unacclimated soils. 1-Methylnaphthalene
is not expected to undergo hydrolysis in soils; yet,
should undergo direct photolysis in sunlit surface soils.
A calculated Koc range of 730 to 3035(1) indicates a low
to slight mobility class in soils for 1methylnaphthalene(2).
A Henry's Law constant of 2.6X10-4
atm-cu m/mole at 25 deg C(3) suggests volatilization of
1-methylnaphthalene from moist soils with a low organic
matter content may be important. [(1) Lyman WJ et al;
Handbook of Chemical Property Estimation Methods NY:
McGraw-Hill p. 4-9 (1982) (2) Swann RL et al; Res Rev 85:
16-28 (1983) (3) Mackay D et al; Volatilization of Org
Pollutants from Water USEPA-600/53-82-019 (NTIS PB 82-230
939) (1982)].
AQUATIC FATE: The biodegradation of 1-methylnaphthalene
in marine water and waters acclimated to PAHs is expected
to be rapid. For unacclimated aquatic systems, 1methylnaphthalene
should biodegrade at a moderate rate.
1-Methylnaphthalene is not expected to undergo hydrolysis
in environmental waters. The direct photolysis half-life
for 1-methylnaphthalene in sunlit waters at midday,
midsummer and 40 deg N latitude was predicted to be 22
hr(1). Bioconcentration of 1-methylnaphthalene is not
expected to be important in aquatic systems. Limited
monitoring data and an estimated Koc ranging from the low
to slightly mobile class(2) suggests 1- methylnaphthalene
may partition from the water column to organic matter
contained in sediments and suspended solids. A Henry's
Law constant of 2.6X10-4 atm-cu m/mole at 25 deg C(3)
suggests volatilization of 1-methylnaphthalene from
environmental waters may be important(4). Based on this
Henry's Law Constant, the volatilization half-life from
a model river has been estimated to be 7.5 hr(4,SRC). The
volatilization half-life from a model pond, which
considers the effect of adsorption, has been estimated to
be 11.8 days(5,SRC). [(1) Zepp RG, Schlotzhauer PF; pp
141-58 in PAH. Jones PW, Leber P (ed) Ann Arbor Sci Pub
Inc (1979) (2) Swann RL et al; Res Rev 85: 16-28 (1983)
(3) Mackay D et al; Volatilization of Org Pollutants from