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Atmospheric deposition of trace metals and metalloids recorded by Misten peat (Hautes-Fagnes, Belgium) during the Industrial Revolution

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mallan@doct.ulg.ac.be

nathalie.fagel@ulg.ac.be

www.ages.ulg.ac.be

Mohammed Allan

a

, Gaël Le Roux

b, c

, François De Vleeschouwer

b, c

, Nathalie Fagel

a

a

AGEs, Département de Géologie, Université de Liège, Allée du 6 Août, B18 Sart Tilman B-4000, Liège, Belgium;

b

Université de Toulouse ; INP, UPS; EcoLab; ENSAT, Avenue de

l’Agrobiopole

, 31326 Castanet Tolosan, France ;

c

CNRS; EcoLab; 31326 Castanet Tolosan, France

206

Localisation

Aims

To determine the extent of atmospheric TM

contamination, it is necessary to identify the main past

and present sources of TM emissions. Peat bogs have

a great potential to record anthropogenic inputs via

their constituting mosses, because they draw their

nutrients only from the atmosphere. We determine

precisely the chemical depth-profiles of V, Cr, Co, Ni,

Cu, Zn, As, Cd, Sb, Pb, and Pb isotopes, in a high

resolution peat-sampled sequence. We investigate

possible mobility of TM by comparing some elements

(Pb, Cu, Ni, Cr, V, and Zn) with another

high-resolution peat sequence. By coupling cluster analyses

and Pb isotopes, we identify TM relationships and

sources since the last 200 years. We finally compare

our results with previous investigation in a low

resolution peat core focused on Pb in the same area

(De Vleeschouwer et al., 2007) and in Western

Europe.

Material

• Peat cores were collected in 2008.

•Ages of top layers were calculated using

210

Pb decay and the CRS model (Appleby,

2001).

14

C measurements were performed

with NEC 0.5MV Pelletron spectrometer in

Poznan Radiocarbon Laboratory, Poland. An

age model was obtained by combining the

results with the

210

Pb..

•The concentrations of major and trace

elements were measured by ICP-MS, at the

Paul Sabatier University-Toulouse, France.

•Lead isotope ratios were measured on a

MC-ICP-MS

(DSTE,

University

of

Brussels).

R

es

u

lt

s

an

d

I

n

te

rp

re

ta

ti

on

We thank the Walloon Region as well as the F.N.R.S

for funding this project. We also thank all personnel

who participated in this project.

•The Misten peat bog is heavily polluted in metals and metalloids

•The main trends in TM concentration profiles suggest common sources of these elements and support the view that TM (except Zn and Cd) are immobile in peat. Other TM are highly enriched in peat surface layers and may indicate that they are carried on by large unweathered particles. •The lead isotope data and statistic methods were used to identify the independent historical TM sources.

•Industrial Revolution is characterized by different sources such as regional Pb ore mining, coal combustion and steel industry (“Sillon Sambre et Meuse”), which declined during the sixties-seventies. • Pb isotopes in the top layers fingerprint a secondary recent source, which remains to be identified.

C

on

cl

u

si

on

Atmospheric deposition of trace metals and metalloids recorded by Misten peat

(Hautes-Fagnes, Belgium) during the Industrial Revolution

Acknowledgements

Profiles of major and trace element concentration (µg g

-1

),

206

Pb/

207

Pb ratios, and bulk density

(g.cm

-3

) versus depth. Black line corresponds to TM concentration measured in 01W core and

gray line some TM concentration measured in 06W core

Calculated total atmospheric fluxes (in mg. m

-2

. yr

-1

) of Pb, Cu, Sb,

Ni, As, Cr, V, Co, Cd and Zn for the Misten peat bog core 01W.

Dendogram for AR of TM, Ti and Al in the Misten peat bog for different periods. a) AR of TM, Ti and Al measured between 1400 and 1700 AD, b) AR of TM, Ti and Al measured over the Industrial Revolution, c) AR of TM, Ti and Al measured for the interval between 1990 and 2008, d) TM emissions measured in Walloon region between 1990 and 2008.

D

ep

th

(

cm

)

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