Post on 20-Jan-2018
description
δ13C/12C measurements of particulate matter in Preila,
Lithuania
Andrius Garbaras
Institute of PhysicsVilnius, Lithuania
2008
Isotopic characterization of PM can play an important role in the individuation of primary and secondary sources and also in the determination of the natural/biogenic or anthropogenic/combustion contribution to the measured concentration
Stable isotopes in nature
Delta notation
sample13 3
standart
1 10R
δ C(‰)R
Rx=
[13C ][12C ]
Rx=[13C ][12C ]
R – izotopic ratio, RPDB = 0,0112372±0,0000090
Standart:C: PDB (PeeDee Belomnite)
PM characterisation by carbon isotope
PM Characterization by Carbon IsotopeC. Grassi, V. Campigli, L. Dallai, S. Nottoli, L. Tognotti, M. GuidiCite abstract as Author(s) (2007), Title, European Aerosol Conference 2007, Salzburg, Abstract T15A011
In the background and suburban sites the δ13C sow a bigger variability than in the urban sites, and this could be well correlated with the constant emissions from traffic. In background sites variability is bigger and related to the changing in the contribution from natural, secondary and anthropogenic source emissions.
Low volume samplerQuartz fibre filters24h
13C/12C can be satisfactory indicator of the origin of the atmospheric carbon
Aerosols are often a mixture and their apparent δ13C is dependent on the relative intensity of the contributing sources
Industrial combustion or vegetation fire
Marine source and natural continental sources
Widory, D. et al. (2004). Atmospheric Environment 38, 953–961.
Carbon-isotope composition of aerosols can distinquish between diesel an fuel oil, and other sources
07/05 diesel contribution about 50%. But other identification is not possible through the sole use of stable carbon isotopes
The use of isotopes for understanding airborne pollution sources is encouraging
PM2.5 PM10 Paris
He
CO2
Elemental analyser
Isotopic ratio mass spectrometer
Elemental analyserto IRMS
Isotopic ratio mass spectrometer
12C16O16O (m/z=44)13C16O16O (m/z=45)
Sampling:• Sampling for 24 h • Quartz fiber filters, preheated 600°C, 3hs• PM 2.5 sampler , flow 2.3 m3/h
Analysis:filter is cut to 1/6, put in to tin capsule and
dropped to EA
Chromatogram
3/21/2
008
3/23/2
008
3/25/2
008
3/27/2
008
3/29/2
008
3/31/2
008
4/2/20
08
4/4/20
08
4/6/20
08
4/8/20
08
4/10/2
008
4/12/2
008
4/14/2
008
4/16/2
008
4/18/2
008
-32
-31
-30
-29
-28
-27
-26
-25
-24
-23
d13C
/12C
Date
Aerosol 13C/12C measurements
3/21/2
008
3/23/2
008
3/25/2
008
3/27/2
008
3/29/2
008
3/31/2
008
4/2/20
08
4/4/20
08
4/6/20
08
4/8/20
08
4/10/2
008
4/12/2
008
4/14/2
008
4/16/2
008
4/18/2
008
-32
-31
-30
-29
-28
-27
-26
-25
-24
-23
d13C
/12C
Date
3/21/2
008
3/23/2
008
3/25/2
008
3/27/2
008
3/29/2
008
3/31/2
008
4/2/20
08
4/4/20
08
4/6/20
08
4/8/20
08
4/10/2
008
4/12/2
008
4/14/2
008
4/16/2
008
4/18/2
008
-32
-31
-30
-29
-28
-27
-26
-25
-24
-23
d13C
/12C
Date
3/21/2
008
3/23/2
008
3/25/2
008
3/27/2
008
3/29/2
008
3/31/2
008
4/2/20
08
4/4/20
08
4/6/20
08
4/8/20
08
4/10/2
008
4/12/2
008
4/14/2
008
4/16/2
008
4/18/2
008
-32
-31
-30
-29
-28
-27
-26
-25
-24
-23
d13C
/12C
Date
3/21/2
008
3/23/2
008
3/25/2
008
3/27/2
008
3/29/2
008
3/31/2
008
4/2/20
08
4/4/20
08
4/6/20
08
4/8/20
08
4/10/2
008
4/12/2
008
4/14/2
008
4/16/2
008
4/18/2
008
-32
-31
-30
-29
-28
-27
-26
-25
-24
-23
d13C
/12C
Date
Black carbon
2008
.03.21
2008
.03.23
2008
.03.25
2008
.03.27
2008
.03.29
2008
.03.31
2008
.04.02
2008
.04.04
2008
.04.06
2008
.04.08
2008
.04.10
2008
.04.12
2008
.04.14
2008
.04.16
2008
.04.18
0
1000
2000
3000
4000
5000
6000
7000
8000B
C, n
g/m
3
Date
mean
0 2000 4000 6000 8000
-32
-31
-30
-29
-28
-27
-26
-25
-24
d1
3C/1
2C
BC, ng/m3
Take home messages
carbon δ13C/12C ratio is indicator of different aerosol origin