Agriculture Reference
In-Depth Information
Chapter 5
R
ETENTION
,
M
IGRATION AND
T
RANSFORMATION OF
S
OME
T
YPICAL
P
OLLUTANTS IN
M
ODERATELY
C
ONTAMINATED
F
ARMLAND
T
OPSOILS IN
N
ORTHEAST
C
HINA
Xingmin Zhao
1,2
, Deming Dong
1
and Xiuyi Hua
1
1
College of Environment and Resources, Jilin University,
Changchun 130012, China
2
College of Resources and Environment, Jilin Agricultural University,
Changchun 130118, China
A
BSTRACT
Contents, speciation and transportation of heavy metals (Pb, Cd, Cr
and As) and organchlorine pesticides (DDT and BHC) in topsoils (0-20
cm) of two farmland sites near pollutant sources in northeast China were
investigated and compared. The results showed that the contents of heavy
metals (Pb, Cd, Cr and As) in the topsoils were relatively higher, which
followed the order of Pb > Cd > Cr > As, while the contents of DDT and
BHC were comparatively lower. Majorities of Pb, Cr and As were found
to be existed in residual fraction, while Cd was mainly bound by organic
matters. There was only little amount of exchangeable Pb, Cd, Cr and As.
The bioavailability of heavy metals in the topsoils followed the order of
