Black carbon and sorption of PAHs in natural fireimpacted sediments from Oriole Lake (CA) Rainer Lohmann1*, Kevyn Bollinger1, John King1, Mark Cantwell2, Tony Caprio3 1Graduate
School of Oceanography, University of Rhode Island, Narragansett, RI, 02882, USA 2U.S. EPA, ORD\NHEERL-Atlantic Ecology Division, 27 Tarzwell Drive, Narragansett, RI 02882, USA 3 National Park Service, Sequoia & Kings Canyon National Parks, Three Rivers, CA 93271, USA
[email protected]
project sampling location in 2007
Downcore profiles % OC
depth (c m )
15
20
% BC 1.0
25
2.0
B C - d 13C 3.0
-26
0
0
0
5
5
5
10
10
10
15
15
15
20
20
25
-28
-30
% retene
total P A Hs (ng /g dw)
O C - d 13C -32
0
500
1000
1500
0.4
2000
0
0
5
5
10
10
15
15
20
20
20
25
25
25
25
30
30
30
30
30
35
35
35
35
35
40
40
40
40
40
45
45
45
45
45
Further work Establish BC record for last ~ 500 years, compare to tree record Is sorption of PAHs affected by chars? -1 -1 K d = focK oc + fSBCK SBCCwn (+ fcharK charCwnchar )? Use passive samplers to measure [PAH]porewater and Kd values Funding ACS-PRF# 46099-G2
Acknowledgements • SEKI staff for help in the field • Nate Vinhateiro, Chip Heil (URI-GSO) for field sampling • Julia Sullivan (URI-GSO) for more core extractions
0.6
0.8
1
