XRF Analysis of Heavy Metals for Surface Soil of Qarun Lake and Wadi El Rayan in Faiyum, Egypt

doi:10.4236/ojmetal.2013.32A1003

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Open Journal of Metal, 2013, 3, 21-25

http://dx.doi.org/10.4236/ojmetal.2013.32A1003 Published Online July 2013 (http://www.scirp.org/journal/ojmetal)

XRF Analysis of Heavy Metals for Surface Soil of Qarun

Lake and Wadi El Rayan in Faiyum, Egypt

Samia M. El-Bahi1, Amany T. Sroor1, Najat F. Arhoma2, Saher M. Darwish2*

1Nuclear Physics Laboratory, Faculty of Girls, Ain Shams University, Heliopolis, Egypt

2Physics Department, Faculty of Science, Cairo University, Giza, Egypt

Email: *[email protected]

Received April 22, 2013; revised May 25, 2013; accepted June 5, 2013

which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

ABSTRACT

The environmental pollution with some heavy metals for twenty four surface soil samples collected from Qarun Lake

and Wadi El Rayan region in Faiyum, Egypt u tilizing X-ray fluorescence (XRF) spectroscopy was measured. The con-

centrations of 13 elements Cr, Ni, Cu, Zn, Zr, Rb, Y, Ba, Pb, Sr, Ga, V and Nb were determined. The elemental concen-

trations were compared with the normal values and other studies in different locations from the world. The correlation

between elements appears that pollu tion inside the investigated lake and Wadi result from different sources of contami-

nation present inside them. The results establish a database reference of radioactivity background levels around these

regions.

Keywords: XRF; Heavy Metals; Surface Soil; Faiyum

1. Introduction

Studying the levels of radionuclide distribution in the

environment provides essential radiological information

[1-4]. As a resu lt of rapid urbanization and indu strial de-

velopment, heavy metal contamination has been threat-

ening human health [5]. A soil pollution assessment be-

comes very complex when different sources of contami-

nation are present and their products are variably distr ib-

uted. In these cases, the spatial variability of heavy metal

concentrations in soils is basic information for identify-

ing the possible sources of contamination and to deline-

ate the strategies of site remediation.

The present study aims to assess the heavy metal con-

tamination for surface soil of Qarun Lake and Wadi El

Rayan regions in Faiyum, Egypt.

2. Material and Methods

Soil samples are collected from Qarun Lake and Wadi El

Rayan in El Faiyum, middle Egypt, as shown in Figure 1.

El Faiyum located 130 km southwest of Cairo. Qarun

Lake is a closed saline lake, located in the deepest part of

El Faiyum depression at the western desert, 70 km south

Cairo-Egypt between longitudes 30˚24' & 30˚49'E and

latitudes of 29˚24' & 29˚33'N. It has an area of about

200 km2. It is used as a reservoir for the drainage water

of El Faiyum province [6]. Qarun Lake water level is cur-

rently about 44 m below mean sea level [7]. The valley

of Wadi El Rayan stretches on an area of 1759 km2.

About 65 km southwest of El Faiyum city and 80 km

west of the Nile River. The reserve is composed of: A

50.90 km2-upper lake, 62.00 km2-lower lake, waterfalls

between the two lakes. Wadi El Rayan waterfalls con-

sidered to be the largest waterfalls in Egypt. This region

suffers from complex problems of pollution as a resu lt of

the high salinity in the water and presence of sewage,

agricultural drainage flows inside it [8].

Twenty four surface soil samples, twelve from Qarun

Lake (Q1 to Q12) and Twelve from Wadi El Rayan (W1 to

W12), were collected from different locations along 12

kilometer, where the distance between each successive

samples about one kilometer. The soil samples were dried,

homogenized and sieved at 200 mesh grain size, pressed

powder pellets were prepared by filling an alumina cup,

(diameter 4 cm, height 1.2 cm and weight 3 gm), with 9

gm of crystalline boric acid covered by 1 gm of the

grounded sample, and then pressed under 12 tons by using

semi-autom atic hydraulic pre ss model HER ZOG HTP-40.

To avoid trace elements contaminations, the powdered

samples were subjected to complete chemic al analysis in

the laboratories of Nuclear Materials Authority, Cairo

*Corresponding a uthor.

S. M. EL-BAHI ET AL.

Figure 1. Map of the geology of Faiyum indicating location

of Qarun Lake, Wadi El-Rayan and the Faiy um depression,

showing elevations in meters w.r.t. mean sea level.

Egypt, using the wet chemical analyses for the major

oxides and XRD to analyze the trace elements.

Trace elemental analysis of samples by X-Ray fluo-

rescence were performed using a Philips PW X-Unique

II X-ray spectrometer with automatic sample changer

PW 1510, (30 positions) at the Nuclear Materials Au-

thority, Cairo, Egypt. This instrument is connected to a

computer system using X-40 program for spectrometry.

The trace elements concentrations are calculated from the

program’s calibration curves which were set up accord-

ing to international reference materials, (standards), as

NIM-G, G-2, GSP-1, AGV-1, JB-1 and NIM-D. The

trace elements were measured by calibrating the system

under the conditions of Rh-target tube, LiF-420 crystal,

gas flow proportional counter, (GFPC), coarse collima-

tors, vacuum, 30 kV and 40 mA for the determination of

V, Cr, Co, Ni, Cu, Zn and Ga, 70 kV and 15 mA, for Rb,

Sr, Y, Zr and Nb and 100 kV and 10 mA for the deter-

mination of Ba and Pb. The detection limit is the lowest

concentration, and it is function of the level of back-

ground noise relative to an element signal [9]. The detec-

tion limit for the elements measured by XRF technique is

estimated at 2 ppm for Rb, Nb, Ga, Co, Y and Sr and at 8

ppm for Pb and Cu and 5 ppm for other measured trace

elements.

3. Results and Discussion

XRF results for collected surface soil samples from Qa-

run Lake and Wadi El Rayan regions evident the exis-

tence of the following elements: Cr, Ni, Cu, Zn, Zr, Rb,

Y, Ba, Pb, Sr, Ga, V and Nb , shown in Tab le 1 . It can be

seen that Cr and Cu concentrations for all studied sites

are greater than the normal values 30 and 20 mg/kg, re-

spectively, while the Ni, Zn, Pb and V concentrations are

lower than the normal values 20, 100, 20 and 50, respec-

tively [10] for all studied sites except site Q5 at Qarun

Lake recorded high concentrations for Ni and V. It is

clear also that, samples have high concentration of Zr

and Nb which means a presence of uranium and thorium

in these samples. Also Sr has a great importance, since

90Sr is a radioactive isotope with a half-life of 28.78

years. Table 1 also shows that, all samples contain a high

concentration of Ba which can be separated using differ-

ent methods in order to use it in different important in-

dustries [11]. Barium sulfate is important to the petro-

leum industry. Barium oxide is used in a coating of the

electrodes of fluorescent lamps. Barium carbonate is used

in glass-making. Barium fluoride is used for optics in in-

frared applications. Barium, commonly as barium nitrate,

is used to give green colors in fireworks. Also, there are

other trace elements like Rb, Y and Ga with different

concentrations. A soil pollu tion assessment becomes very

complex when different sources of contamination are

present and their products are variably distributed [12].

Table 2 gives the comparison of trace element con-

centrations in present work with other reference data [10,

12-16]. It can be seen that the present concentrations of

Cr, Ni, Cu, Zn and Pb is lower than that (ISIW) in Ro-

mania [10] and Hyderabad city in India [15] and all these

concentrations exceeded threshold values [16]. Table 2

shows also that the present concentration of V is lower

than that of (ISIW) at Romania and the threshold value

[16]. Existences of all these elements with different val-

ues caused many diseases if reached to human bodies

[17]. For example, Cr caused carcinoma, Cu caused cir-

rhosis, nausea, vomiting and diarrhea, Ba high toxic sub-

stantive caused carcinoma, hypogonadism and diarrhea.

Using the elemental analysis data obtained (Table 1),

we have calculated the matrices shown in Table s 3 and 4,

by calculating the Pearson’s correlation coefficient R2

[18] between each two elements in soils collected from

Qarun Lake and Wadi El Rayan, respectively.

From the correlation matrix of Qarun Lake (Table 3),

it can be seen that the Pearson coefficient R2 has greater

values than 0.60 for the following pairs of elements:

Ba-Pb, Ba-Rb, Ba-V, Ba-Ni, Cr-Nb, Cr-Sr, Cr-Y, Ni-Rb,

Ni-Pb, Ni-V, Ni-Zn, Rb-Pb, Rb-V, V-Pb, Y-Sr, Zn-Ba,

Zn-Pb, Zn-Rb and Zn-V. The correlation matrix of Wadi

El Rayan samples (Table 4) shows that the Pearson coef-

ficient R2 has greater values than 0.60 for the following

pairs of elements: Ba-V, Ba-Y, Ba-Zr, Zr-Cu, Zr-V and

Zr-Y. This means that all elements that make an R-

squared value greater than 0.60 with another element will

co-precipitate, to some extent, with that element. This

relationship for a few selected elements in Table 4,

proofs also that the pollution inside it is caused by dif-

ferent sources of contamination.

4. Conclusion

XRF technique has been employed in order to reveal

their mineral composition to evaluate the pollution of soil

S. M. EL-BAHI ET AL.

Table 1. Trace elements concentrations (in ppm) using XRF spectroscopy for surface soil samples from Qarun Lake and

Wadi El Rayan in Faiyum, Egypt.

Sample Cr Ni Cu Zn Zr Rb Y Ba Pb Sr Ga V Nb

Q1 98 12 43 44 79* 26 11 103 u.d 33 12 11 31

Q2 52 11 37 28 141 16* 22 96 u.d 71 11 7* 24

Q3 82 16 46 29 146 26 18 236 u.d 57 12 17 28

Q4 86 23 46 36 150 27 17 395 6 56 17** 31 33**

Q5 62 46** 43 90** 168 51** 19 725** 17** 61 10* 57** 28

Q6 48 17 46 27 146 16* 22 153 u.d 70 11 15 22*

Q7 26 9* 34* 32 152 17 26 57* u.d 82 10* 7

* 23

Q8 32 14 39 25* 129 17 21 63 u.d* 67 11 7* 24

Q9 29 13 37 32 166 19 26 166 4 84 10* 14 23

Q10 34 12 35 28 149 17 34 144 u.d 75 11 11 24

Q11 44 23 43 49 231 39 27 529 6 85 10* 40 25

Q12 56 15 40 37 182 27 26 302 u.d 80 11 21 25

W1 23* 18 52** 28 98 20 9* 155 u.d* 26 11 11 28

W2 203 15 48 33 252 22 24 285 2 69 11 12 27

W3 157 14 49 28 194 20 19 223 u.d* 59 12 12 28

W4 180 16 43 28 420 19 11 200 u.d* 34 12 14 30

W5 192 17 50 30 320 22 15 250 u.d* 100 11 14 29

W6 175 14 47 29 203 23 14 270 2 120 13 16 31

W7 160 17 46 32 554 24 35 302 2 17* 12 16 28

W8 203** 15 49 27 168 18 16 193 u.d* 49 12 11 29

W9 145 15 48 31 118 25 11 251 u.d* 35 13 13 32

W10 194 14 48 32 260 20 20 291 u.d* 78 12 15 31

W11 123 15 43 30 737** 21 38** 433 2 137** 11 17 27

W12 121 16 43 30 730 20 36 433 2 137** 12 17 30

*The lowest value; **The highest value.

Table 2. Comparison of the trace element concentrations (in ppm) for studied samples with other studies in different loca-

tions from the world.

Element Karon Lake* Wadi El Rayan* Marmara Sea

[12] Gulf of Naples

[13] Saros Gulf [14] (ISIW) at Romania

[10] Hyderabad,

India [15] Threshold value

[16]

Cr 26 - 98 23 - 203 65 - 85 11 - 66 35 - 75 52. 9 - 101.3 12.3 - 480.6 10 - 50

Ni 9 - 46 14 - 18 35 - 50 0.01 - 26.7 <5 - 75 41.9 - 65.6 12.6 - 132.0 10 - 50

Cu 34 - 46 43 - 52 20 - 80 3 - 664 <0.5 - 48 <15 - 52.8 11.1 - 186.6 10 - 40

Zn 25 - 90 27 - 33 60 - 145 77 - 1765 25 - 120 34.0 - 121.0 40.8 - 882.2 20 - 200

Zr 79 - 231 98 - 737 -

Rb 16 - 51 18 - 25 -

Y 11 - 34 9 - 38 -

Ba 57 - 725 155 - 433 100 - 1000

Pb u.d - 17 u.d - 2 11.0 - 52.2 42.9 - 1832.5 10 - 30

Sr 33 - 85 17 - 137 -

Ga 10 - 17 11 - 13 -

V 7 - 57 11 - 17 95.5 - 110.7 30 - 150

Nb 22 - 33 27 - 32 -

*Present study.

S. M. EL-BAHI ET AL.

Table 3. Correlation coefficent between trace elements in Qarun Lake, Egypt.

Element Cr Ni Cu Zn Zr Rb Y Ba Pb Sr Ga V Nb

Cr 1

Ni 0.06 1

Cu 0.52 0.21 1

Zn 0.06 0.81* 0.05 1

Zr 0.17 0.12 0 0.06 1

Rb 0.12 0.79* 0.19 0.86* 0.18 1

Y 0.65* 0.05 0.4 0.06 0.34 0.06 1

Ba 0.06 0.85* 0.22 0.72* 0.35 0.89* 0.01 1

Pb 0.02 0.9* 0.08 0.83* 0.14 0.74* 0.02 0.79* 1

Sr 0.73* 0.02 0.28 0.04 0.57 0.03 0.74* 0 0.002 1

Ga 0.39 0.001 0.24 0.03 0.08 0.003 0.2 0.003 0.0003 0.25 1

V 0.06 0.89* 0.23 0.76* 0.29 0.89* 0.01 0.99* 0.84* 0.001 0.003 1

Nb 0.78* 0.13 0.33 0.12 0.09 0.21 0.49 0.14 0.11 0.59 0.57 0.15 1

*Strong corr elation.

Table 4. Correlation coefficent between trace elements in Wadi El Rayan, Egypt.

Element Cr Ni Cu Zn Zr Rb Y Ba Pb Sr Ga V Nb

Cr 1

Ni 0.28 1

Cu 0.02 0.03 1

Zn 0.07 0.01 0.02 1

Zr 0.004 0.02 0.69* 0.05 1

Rb 0.001 0.001 0.002 0.37 0.001 1

Y 0.0001 0.0004 0.37 0.19 0.74* 0.008 1

Ba 0 0.03 0.49 0.22 0.71* 0.03 0.76* 1

Pb 0 0.01 0.29 0.20 0.38 0.12 0.56 0.53 1

Sr 0.01 0.12 0.17 0.01 0.26 0.004 0.21 0.54 0.25 1

Ga 0.05 0.23 0.03 0.01 0.05 0.12 0.06 0.01 0.002 0.01 1

V 0.002 0.01 0.56 0.12 0.64* 0.08 0.44 0.67* 0.41 0.39 0.03 1

Nb 0.03 0.09 0.004 0.0004 0.07 0.04 0.18 0.01 0.09 0.0004 0.64* 0.03 1

*Strong corr elation.

with heavy metals. The concentrations of thirteen ele-

ments (Cr, Ni, Cu, Zn, Zr, Rb, Y, Ba, Pb, Sr, Ga, V and

Nb) in Qarun Lake and Wadi El Rayan regions were de-

termined. A soil pollution assessment becomes very com-

plex when different sources of contamination are present

and their products are variably distributed with time as-

sembling and become toxic. As a result of existent of all

these elements, these places are pollutant and when using

it in agriculture will cause danger to humans, since toxic

substances will move toxic substances from soil into

plants and then to human bodies. Therefore, we recom-

mend not use it in agriculture, until solving the main

problems of pollutio n in this region, su ch as high salinity

in water and presence of sewage, agricultural drainage

flows inside it and others. The results of this study can be

used as a data baseline for preparing a radiological map

of the study area, especially at the chosen sites.

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