Metal Transport Parameters in Residual Soil with an Undisturbed and Remolded Structure Percolated by an Acid Solution

doi:10.4236/jep.2011.28124

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Journal of Environmental Protection, 2011, 2, 1076-1083

doi:10.4236/jep.2011.28124 Published Online October 2011 (http://www.scirp.org/journal/jep)

Metal Transport Parameters in Residual Soil with

an Undisturbed and Remolded Structure

Percolated by an Acid Solution

Eduardo Pavan Korf1, Antonio Thomé2, Nilo Cesar Consoli1, Rafael de Souza Tímbola2,

Gláucia Carine dos Santos1

1Department of Civil Engineering, Federal University of Rio Grande do Sul, Porto Alegre, Brazil; 2University of Passo Fundo, Passo

Fundo, Brazil.

Email: eduardok[email protected]

Received July 18th, 2011; revised August 21st, 2011; accepted September 22nd, 2011.

ABSTRACT

There is no enough informa tion about metal transport parameters in residual so il. These soils are generally structured

and still there is no answer to what happens with the contaminant transport parameters when an acid solution with

metal percolates this material with different structure. The objective of this study was to determine the contaminant

transport parameters for Cd, Ni, Cu and Zn metals in an acid multispecies solution to a residual soil from south Brazil

with an undisturbed and remolded structure. Column tests were carried out to determine the Rd, kd, Dh transport pa-

rameters. It was possible conclude that the magnitude of the kd, Rd and Dh parameter did n ot vary sign ificantly with the

soil structure.

Keywords: Pollutant Transport, Column Equipment, Natural Attenuation, Dissolved Metals, Analytical Simulation

1. Introduction

Acidic and inorganic materials in residual water repre-

sent a common effluent from industrial activities such as

mining (coal and mineral deposits), electroplating, cast-

ing and the handling of chemical substances in general.

These effluents, if not well managed, may generate en-

vironmental pollution and have a negative impact on soil,

superficial and underground water and ecosystems [1-

11].

The metals when inserted in the environment may

cause serious damage to toxicity in exposed organisms,

because metals may be inserted in the food chain due to

their high mobility. [12] have claimed that contamination

by metals may lead to both acute and chronic high toxi-

city, persist in an environment, high mobility and accu-

mulate in organisms due to their liposolubility. Addi-

tionally, metal compounds, even in small amounts, may

be toxic to plants and animals [13,14].

Studies are needed to provide an understanding of the

control mechanisms of solution with metallic compounds

on the residual soil, mainly from south Brazil. Such

studies should be conducted with the objective of moni-

toring the contamination plumes migration and carried

out environmental models studies. Additional studies might

also accelerate immobilization and decontamination pro-

jects or suspend such procedures for verifying effective-

ness of natural attenuation processes [15].

The migration of pollutants to the subsurface is in-

fluenced by several factors that may determine the move-

ment of metal through the soil. These factors are de-

scribed by physical and biophysical-chemical processes,

which are represented by the theoretical model. The

physical process, in general, involves diffusion and me-

chanical dispersion phenomena, and one may be predo-

minant over the other. The summation of those two pro-

cesses is called hydrodynamic dispersion (Dh). This phe-

nomenon is characterized in the diffusive part by mo-

lecular diffusion coefficient (D*), which is represented

by the direct relationship between the coefficient diffu-

sion in free solution (Do) and a physical-chemical factor

called tortuosity (τ). In the dispersive part of transport,

the phenomena are represented by the mechanical dis-

persion (α) and the percolation speed (vs). The bio-

physicochemical processes are related to the physical,

chemical and biological interactions that may occur be-

tween the soil and the pollutant. In those processes, the

interaction between the environmental conditions, the

Metal Transport Parameters in Residual Soil with an Undisturbed and Remolded Structure Percolated 1077

by an Acid Solution

pollutant and the porous media may cause the delay, ac-

celeration or degradation of pollution. The parameter that

governs these processes is the retardation factor (Rd)

which is directly co-related with the distribution coeffi-

cient (kd). All the contaminant transport parameters can

be determined through laboratory experiments such as

column tests, diffusion tests and batch tests. Also, they

can be estimated according to literature data and by cor-

relations or through retro-analysis with analytical or nu-

meric solutions [16-27,5,7]).

The objective of this study was to determine the con-

taminant transport parameters of for Cd, Ni, Cu and Zn

metals dissolved in a pH multispecies acid solution in a

residual soil with undisturbed and remolded structures.

Both soil structures were evaluated with the objective of

simulating, respectively, the condition of a natural barrier

in the field as well as a remolded condition that repre-

sents the artificial soil barrier to prevent the percolation

of an acidic and inorganic pollutant.

2. Experimental Program

2.1. Materials

2.1.1. Residu a l Soil

The soil utilized in the present research was a basaltic re-

sidual soil sampled from the Geotechnical Experimental

Site of the University of Passo Fundo, located in south-

ern Brazil.

According to [28] the pedological classification is a

Humic Oxisol. These soils are very deep, drained and

highly weathered, and they show a sequence of A-Bw-C

horizons, where Bw is a oxisol type. In this study was

used the Bw horizon only. These soils have very little

clay increase with depth, and there is a gradual transition

between the horizons. Because the soils were very

weathered, there is a dominance of kaolinite and iron

oxides, which gave the soil samples a low CEC (cation

exchange capacity), strong acidity and a low stock of

nutrients. Its red color indicates that the soil had a low

base saturation and high iron content [29].

Regarding of chemical characterization, the residual

soil used has an acidic pH (5.4), high clay content (68%),

low organic matter content (<0.8%) and low CEC (8.6

cmolc/dm³), which is typical of soils with the predomi-

nance of kaolinite clay mineral. The geotechnical char-

acterization, based on characterization tests, indicated

soil is clay and have high compressibility—CH [29].

The mineral characterization, related to the specific

superficial area (SSA—was 33.86 m2·g–1), indicated a

predominance of kaolinite clay, according to the range of

values proposed by [30,31].

2.1.2. Pollu t ant Solution

The pollutant solution contained metals dissolved in dis-

tilled water with pH 1.35. This value was used to repro-

duce the condition of high solubility, attempting to avoid

precipitation chemical reactions. The metals concentra-

tion in the pollutant solution used in column tests were

defined according to increasing the intervention value for

underground water from Company of Technology in

Environmental Sanitation—CETESB [32]. The interven-

tion value indicates the need of remediation actions for

the possible risks receptors [32].The increase this value

represents an extreme condition of contamination, re-

quiring monitoring or remediation measures. These va-

lues as well as the inserted concentration to different

metal used in this study are presents in Table 1.

2.2. Methods

2.2.1. Molding of the Test Samples

Each sample was taken from the field in its undisturbed

form from the B horizon of the soil (1.2 m depth). In the

laboratory, the cylindrical test samples (TS) were molded

with an undisturbed and remolded structure. The re-

molded test samples had approximately the same density

and natural moisture as the undisturbed samples. The

diameter of the test samples was 5 cm and the heights of

the samples were variable. Tabl es 2 and 3 show the phy-

sical properties for the test samples with undisturbed and

remolded structures, respectively.

2.2.2. Column Test

The column test reproduces the transport of a pollutant

through the soil and is used for determination of physical

Table 1. Concentration of metals inserted in the columns

tests.

Metal

CETESB

Intervention

(mg·L–1)

Increasing

Inserted

Concentration

(mg·L–1)

Ni <0.02 100 2

Cr <0.05 100 5

Pb <0.01 100 1

Cd <0.005 100 0.5

Zn <5 2 10

Cu <2 2.5 5

Mn <0.4 2 0.8

Table 2. Physical properties of the test samples with an

undisturbed struc ture.

Test

sample

Moisture

content

(%)*

Height

(cm)

Diameter

(cm)

Specific.

mass

(g·cm–3)*

Void

ratio Porosity

Void

volume

(cm3)

1 35.279.224.93 1.50 1.41 0.59102.74

2 32.506.405.17 1.43 1.46 0.5979.85

3 34.628.664.57 1.51 1.38 0.5882.38

*Moisture and density equivalent to molding field.

Metal Transport Parameters in Residual Soil with an Undisturbed and Remolded Structure Percolated

1078

by an Acid Solution

Table 3. Physical properties of test samples with a r e molded

structure.

Test

sample

Moisture

content

(%)*

Height

(cm)

Diameter

(cm)

Specific.

mass

(g·cm–3)*

Void

ratio Porosity

Void

volume

(cm3)

4 11.44 5 1.58 1.27 0.56 125.67

5 9.64 5 1.56 1.29 0.56 106.70

34.62

7.96 5 1.55 1.38 0.57 88.82

*Moisture and density equivalent to molding field.

and physical-chemical transport parameters. The test was

conducted with equipment produced according to the

[29]. The test consisted of two steps; the first stage the

distilled water was percolated until flow steady state,

where the hydraulic conductivity was determined. In the

second stage was percolated the pollutant solution. For

each soil structure, three test samples were tested simul-

taneously.

After percolating the pollutant solution through the

soil, the liquid was collected in different percolated vo-

lume and tested times. The metal concentration in each

collected samples was determined through analysis with

an atomic absorption spectrophotometer.

After determining metal present in the percolated ef-

fluent from the test samples, it was possible to obtain the

breakthrough curves for each test and metal pollutant.

The breakthrough curve gives the number of percolated

pores (percolated volume/void volume—Vperc/Vv) or

the percolation time (T) along the x axis, and the pollut-

ant relative concentration (percolated effluent concentra-

tion/initial concentration—C/Co) is given along the y

axis.

Tables 4 and 5 show the hydraulic characteristics of

each test sample for the undisturbed and remolded struc-

tures, respectively.

2.2.3. Deter mi n at ion of Trans po rt Parame t er s

Reference [33] developed a one-dimensional analytical

solution (1D) for the flow in homogenous and saturated

soils using both initial and boundary conditions: C (x, 0)

= 0 for x ≥ 0; C (0, t) = Co for t ≥ 0; C (∞, t)/ (t) = 0 for

t ≥ 0. The Equation (1) shows the analytical solution for

a reactive solute for the occurrence of delay biophysical-

chemical processes. In the equation, C/Co is the ratio be-

tween measured percolated effluent concentration and

the initial concentration, erfc is a function of the supple-

mentary error, Rd is the delay factor, L is the one-di-

mensional flow distance given by the height of the test

sample, vs is the percolation speed, t is the time of the

test, and Dh is the hydrodynamic dispersion coefficient.

To determine the Dh parameter, a theoretical curve

was adjusted at experimental transport curve (break-

Table 4. Hydraulic characteristics of test samples with un-

disturbed structure .

Test k (cm·s–1) vs (cm·s–1)

1 5.90 × 10–04 7.66 × 10–03

2 3.70 × 10–04 6.92 × 10–03

3 1.40 × 10–04 3.24 × 10–03

Table 5. Hydraulic characteristics of test samples with

remolded structure.

Test k (cm·s–1) vs (cm·s–1)

4 8.07 × 10–05 2.78 × 10–03

5 1.42 × 10–04 2.92 × 10–03

6 2.76 × 10–04 6.77 × 10–03

through) from column test by the Ogata and Banks solu-

tion Equation (1). To generate a theoretical curve, the

C/Co values were found by establishing different time

ranges (t), the height of the test sample (or the flow dis-

tance along x (L)), the percolation speed (vs) and the

parameters Rd. The Rd parameter was obtained from a

method given by [18], which defines the area above the

transport curve as a value corresponding to Rd.





dssd s

hd hd

Cx,t

RL-vtvLRL+vt

= erfc+experfc

2DRt 2DRt





 







 



 







 





(1)

The kd coefficient was obtained using a linear rela-

tionship between the mass absorbed by a unit of solid

mass and the concentration of the substance in the solu-

tion when the soil is saturated, which was determined

after equilibrium was reached. The parameter kd was

determined according to Equation (2), where: Rd is the

delay factor, ρs is the specific soil dry mass, and n is the

porosity of the test sample [23].

R-1

k= n

ρ (2)

3. Results

3.1. Column Tests

Figures 1 to 4 show some results of columns tests with

the adjustments performed for the analysis of the trans-

port parameters for the residual soil. Only was showed

the best adjustments results for each soil structure and

tested metal. However, these results are representative of

all tests, once the results were similar for each treatment.

Metal Transport Parameters in Residual Soil with an Undisturbed and Remolded Structure Percolated

by an Acid Solution

1079

Figure 1. Column test results and adjustment analysis for cadmium metal (a) undisturbed; (b) remolded structure.

Figure 2. Column test results and adjustment analysis for nickel metal (a) undisturbed; (b) rem olde d str uc ture .

Figure 3. Column test results and adjustment analysis for zinc metal (a) undisturbed; (b) remolded structure.

Metal Transport Parameters in Residual Soil with an Undisturbed and Remolded Structure Percolated

1080

by an Acid Solution

Figure 4. Column test results and adjustment analysis for copper metal (a) undisturbed; (b) remolded str uctur e .

3.2. Contaminant Transport Parameters

Tables 6-9 show the contaminant transport parameters

obtained for the tested metals with undisturbed and re-

molded structures at a pH of 1.35. Variance Analysis for

treatments for Kd, Rd and Dh showed no significant dif-

ference between the structures to the metals: Cd, Ni, Cu

and Zn. Although the Ni metal have presented p = 0.049,

this value is very close to 0.05, which does not reveal

significant differences with confidence ( = 0.05). The

tables also show the average value, standard deviation

and coefficient of variation for the values of kd and Rd

and Dh of each metal.

4. Discussion

Concerning the magnitude of parameters kd and Rd there

are no significant influence of the change of structure for

the metals Cd, Ni, Cu, Zn. The similarity between the kd

and Rd values related to the structure don’t agree with the

finding of [34,35], who have reported that the distur-

bance of a remolded structure influences the pollutants

mobility in soils. The authors have not related the pH,

but this may be true for higher values of pH, which can

decrease metals mobility in solution. In this study, the

similar behavior found with different structures must be

due to high mobility of metals in acidic pH (1.35), which

possibly may have favored the transport in both struc-

tures.

Reference [36] simulated the concentration of a con-

taminating solution at pH 4.5 and 5 mg·L–1, which is

close to most of the concentrations employed in the pre-

sent study in soil with 90.6 % kaolinite and 21 % clay.

They obtained kd values for Cd (4.9 cm3·g–1), Ni (9.5

cm3·g–1), Cu (15.0 cm3·g–1), Zn (6.5 cm3·g–1). The values

reported by [36] are similar to the ones found in the pre-

Table 6. Transport parameters obtained for cadmium metal.

Structure TS Rd k

d (cm3·g–1) Dh (cm2·s–1)

TS1 5.00 2.09 1.50 × 10–2

TS2 5.50 2.45 1.50 × 10–2

Undisturbed

TS3 7.00 3.10 6.67 × 10–3

TS4 3.64 1.26 1.17 × 10–2

TS5 6.52 2.66 8.33 × 10–3

Remolded

TS6 5.00 1.98 1.67 × 10–2

p 0.490 0.311 0.996

Average 5.44 2.26 1.22 × 10–2

Standard Deviation 1.20 0.63 4.04 × 10–3

Coefficient of variation

(%) 22.09 28.09 33.05

*p value of variance analysis.

Table 7. Transport parameters obtained for nickel metal.

Structure TS Rd k

d (cm3·g–1) Dh (cm2·s–1)

TS1 6.70 2.98 6.67 × 10–3

TS2 9.00 4.36 1.00 × 10–2

Undisturbed

TS3 ** 7.23 1.17 × 10–2

TS4 3.00 0.96 6.67 × 10–3

TS5 4.44 1.66 8.33 × 10–3

Remolded

TS6 5.01 1.99 5.00 × 10–2

p 0.049 0.046 0.520

Average 5.63 3.20 1.56 × 10–2

Standard Deviation 2.30 2.30 1.70 × 10–2

Coefficient of variation (%)40.91 72.00 109.14

*The parameter could not be obtained.

Metal Transport Parameters in Residual Soil with an Undisturbed and Remolded Structure Percolated 1081

by an Acid Solution

Table 8. Transport parameters obtained for copper metal.

Structure TS Rd k

d (cm3·g–1) Dh (cm2·s–1)

TS1 5.50 2.35 1.00 × 10–2

TS2 7.97 3.80 3.33 × 10–2

Undisturbed

TS3 ** 6.20 6.67 × 10–3

TS4 6.52 2.64 1.17 × 10–2

TS5 8.49 3.62 1.67 × 10–3

Remolded

TS6 7.29 3.12 3.33 × 10–2

p 0.5900.940 0.710

Average 7.15 3.62 1.61 × 10–2

Standard Deviation 1.18 1.38 1.38 × 10–2

Coefficient of variation (%) 16.5538.08 85.37

*The parameter could not be obtained.

Table 9. Transport parameters obtained for zinc metal.

Structure TS Rd k

d (cm3·g–1) Dh (cm2·s–1)

TS1 2.500.78 1.50 × 10–2

TS2 3.501.36 1.50 × 10–2 Undisturbed

TS3 7.003.10 6.67 × 10–3

TS4 3.111.01 3.33 × 10–3

TS5 4.471.68 8.33 × 10–3 Remolded

TS6 4.291.63 4.17 × 10–2

p 0.8000.690 0.670

Average 4.151.59 1.50 × 10–2

Standard Deviation 1.580.82 1.39 × 10–2

Coefficient of variation (%) 38.1051.26 92.49

sent study. [37] studied metals mobility in oxisol with

72% clay and kaolinite 70.9% and obtained Rd values of

1.34, 1.46 and 3.88 for Zn, Cd and Cu, respectively.

These values are lower than the values obtained in this

study. This is due the different structures and mineral

formation for soil used.

With respect to the metal retention sequence, which

was observed through the average parameters kd and Rd,

the following prevalence order was observed: Cu > Ni >

Cd > Zn. The affinity order obtained by [38], from re-

sidual oxisol in the state of São Paulo, Brazil, had a

similar behavior for Cu and Zn metals. [5] claimed that

Cu metal have reduced mobility in soil as compared to

Zn, Ni and Cd metals, which was confirmed by the re-

sults of this study. Relative to the kaolinite clay mineral,

which was predominant in the studied soil, [19] found

the following preference series for pH values of 3.5 to 6:

Pb > Ca > Cu > Mg > Zn > Cd. Similar results were ob-

tained for the Cu and Zn metals in the current study.

Vega et al. (2006) [36] obtained similar preference series,

which only had opposite behavior between Cd and Zn.

[37] obtained equivalent preference series in the study of

Zn, Cd and Cu metals.

The results for parameter Dh, according to Tables 6-9,

range from 10–3 to 10–2 cm2·s–1 and, according to analysis

of variance, no difference was found between the struc-

tures tested. [25] obtained Dh values for Cd in the hori-

zon B oxisol, resulting in an average value of 2.81 × 10–4

cm2·s–1. [20], obtained Dh values for zinc in clayey soil

used in compacted landfill barriers with average value of

1.78 × 10–4 cm2·s–1. [39], obtained Dh values that ranged

from 2.25 × 10–5 cm2·s–1 to 8.15 × 10–5 cm2·s–1 for a soil

from a urban solid waste landfill, and they studied the

presence of Cd, Cu and Zn metals. The values obtained

by those authors were lower than the values in the pre-

sent study, which could be explained by the difference in

structures and mineral formation and direct influence of

the low kd and Rd values, which also reduced the Dh val-

ues, which have been obtained through these parameters.

5. Conclusions

In this work was studied the contaminant transport pa-

rameters to a clay residual soil from south Brazil with

different structures (undisturbed and remolded) when

percolated with an acid solution (pH = 1.35). The fol-

lowing conclusions can be made:

- The kd, Rd and Dh magnitude did not vary signifi-

cantly with soil structure, thus, it is possible conclude

that the soil structure did not influence the contaminant

transport parameters for this residual soil;

- The metal retention sequence was Cu > Ni > Cd >

Zn.

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