Cd E-mail: m mahmoodi81@yahoo · SS eS k mg kg Se-1 b S ek dC m kd b3 kg-1 Sk k kkCnkS t S 1 2 k2k1...
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* Cd * E-mail: m_mahmoodi81@yahoo.com
Transcript of Cd E-mail: m mahmoodi81@yahoo · SS eS k mg kg Se-1 b S ek dC m kd b3 kg-1 Sk k kkCnkS t S 1 2 k2k1...
Cr (VI)
CuHgCr
CdZn
1 . Convection dispersion equation
Qz
Cv
z
CD
t
S
t
C2
2
Cmg L-1
cm3 cm-3
gr cm-3Dcm2 h-
1vcm h-1z
cmthS
mg kg-1Q
mg cm-3 h-1
wJv
Jwcm h-1
2 . Batch experiments
ke SSS
Semg kg-1
bde CkS
kdm3 kg-1b
Sk
knk SkCk
t
S21
k1k2
h-1n
Q
Ckt
SQ irr
kirrh-1
v
Cd
1. Precipitation / dissolution , Mineralization and immobilization
C0
0,0
0,0
0,00
0,00
0
tLzz
C
tzvCvCz
CD
LztSS
LztC
ke
LCd
2 . Numerical dispersion
A
Ca(NO3)2
1 . Miscible displacement experiments 2 . Plexiglass 3 . Pore volume
Shimadzu AA-
670 C/C0CC0
ztv
k1k2kirr
kdnb
pH EC(%) (%) (%)
(Mg m-3) (Mg m-3) (%)
(dS m-1)
Fe2O3
(%)
Typic Hapludalfs
Fluventic Eutrudepts
Xerofluventic Haplocalcids
Typic Calcixerepts
Fluventic Haplocambids
R2R2
cm3 cm-3
b gr cm-3
z cm
Jw cm h-1
Co mg L-1
Cin mg L-1
D cm2 h-1
k1 h-1
k2 h-1
n
kirr h-1
kd cm3 gr-1
b
z cm
t h
R2 = 0.961
R2= 0.986
R2 = 0.943
R2 = 0.972
C/C
0
R2 = 0.990
h
cm
mg L-1
h(cm)
(mg L-1)
(c
m)
C/C0
0
500
1000
1500
2000
2500
3000
3500
mg
kg-1
0
500
1000
1500
2000
2500
3000
3500
4000
mg
kg-1
0
1000
2000
3000
4000
5000
6000
7000
0 5 10 15 20 25 30 35 40 45 50 55 60 65
mg
kg-1
z=0 z=3 cm z=6 cm z=9 cm
0
50
100
150
200
mg
kg-1
(mgk
g-1)
SeSk
Q
v
cm2 h-1cm h-1
0.92)(R1.4379v0.1233D 2
)72.0(0584.1.)(0028.0
)68.0(6735.2.)(0077.1
)95.0(6326.1.)(426.0
)92.0(1502.0.)(0015.0
)89.0(.)0596.0(exp0002.0
)88.0(.)0523.0(exp7333.0
2
2
2
2
22
21
RClb
RClLnn
RClk
RClk
RClk
RClk
d
irr
Cl.k1k2kirr
h-1kdcm3 gr-1
nb
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lysimeters and field soils with heterogeneous structures. European Journal of Soil Science. 55:229-241.
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longitudinal diffusion in ion exchange and chromatographic columns. J. Phys. Chem. 56:984-988. 11. Leij, F.J., J.H. Dane, & M.Th. van Genuchten .1991. Mathematical analysis of one-dimentional
solute transport in a layred soil profile. Soil Sci. Soc. Am. J. 55:944-953. 12. Selim , H.M. 1981. Modeling kinetic behavior of cadmium interaction in soils. Summer Computer
Simulation Conf,. Washington DC. p. 385-390. 13. Selim , H.M., J.M. Davidson, & R.S. Mansell. 1976. Evaluation of a two-site adsorption-desorption
model for describing solute transport in soils. Summer Computer Simulation Conf,. Washington DC. p. 444-448.
14. Selim , H.M., M.C. Amacher, & I.K. Iskandar .1989. Modeling the transport of Chromium .VI. in soil columns. Soil Sci. Soc. Am. J. 53:996-1004.
15. Selim , H.M., M.C. Amacher, & I.K. Iskandar .1990. Modeling the transport of heavy metals in soils. Monogr.90-2. U.S. Army Cold Regions Res. Eng. Lab., Hanover, NH.
16. van Genuchten, M.Th., & J.C. Parker .1984. Boundary conditions for displacement experiments through short laboratory soil columns. Soil Sci. Soc. Am. J. 40:473-480.
17. van Genuchten, M.Th., & P.J. Wierenga .1986. Solute dispersion coefficient and retardation factors. In Methods of Soil Analysis. Part 1 . A. Klute, ed. 2nd ed. Agronomy. Monograph.9. Madison, Wisconsin: Am. Soc. Agron. and Soil Sci. Soc. Am. 1025-1054.
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