Determination of some Heavy Metal in Sediments of Euphrates River in Nasiriya City, Iraq

 

Mohammed T. Khethi*, Zainab Jawad Kadhim

Chemistry Department, College of Science, Thi-Qar University, Iraq

*Corresponding Author Email: m.turki@sci.thiqaruni.org

 

ABSTRACT:

Topsoil samples (0–20 cm) were collected from the sediments of Euphrates River in September, 2011.Total concentrations of five heavy metals, cadmium (Cd), copper (Cu), iron (Fe), manganese(Mn) and zinc (Zn) were determined using atomic absorption spectrometry in order to assess their contamination levels of the sediments. Four stations were chosen in the Euphrates at Nasiriya city. Results showed that the average concentrations of these heavy metals in the sediments were significantly higher than those previous and similar studies. But the present study indices showed no contamination for Mn, and Zn, in all samples. Location variations were detected in these metals. The highest concentration of Cd was (38µg/g) and the lowest (15µg/g) were recorded in sta.3,4 respectively, Cu revealed the highest conc. 416 µg/g at sta.3. The lowest (317µg/g) was recorde8d in sta.1.The highest conc. of Fe was encountered in sta.2 (384µg/g), while lowest values were recorded from sta.1 was (840 µg/g). Mn showed increments in sta.3 (370 µg/g). and the lowest values were recorded in stas.1 was (327µg/g). Similarly, the highest conc. of Zn were recorded sta.2(96 µg/g)and lowest was (84 µg/g)at sta. 1. The study showed that pollution with some of these metals compared with global standard request watching period and continue test in regular periods.

 

KEY WORDS:

 

 

1. INTRODUCTION:

Water pollution is considered as the most complex problem because of its wide defects and its close relationship to human and its diffusion(1).

 

Metals that are naturally introduced into the Rivers come primarily from such sources as rock weathering, soil erosion, or the dissolution of water-soluble salts(2). Naturally occurring metals move through aquatic environments independently of human activities, usually without any detrimental effects. The metals added by human activities have affected the water quality. Some of these metals are essential for proper metabolism in all living organisms yet toxic at high concentrations; other metals currently thought of as non-essential are toxic even at relatively low concentrations.(3)

 

Major sources of toxic metals arising from human activities are domestic and industrial wastewaters and their associated solid wastes.

 

In the most cases trace element concentrations in bottom sediments indications of water pollution. Soluble fractions of trace elements are, in most aquatic environments, rapidly absorbed either by clay or organic compounds and deposited in sediments or they are caught by plankton and root tissues of aquatic plants. Thus, concentrations of trace elements in selected samples of aquatic compartment reflect either chemical composition of bedrocks or anthropogenic influence(4).

 

Trace elements which are absorbed and thus immobilized in bottom sediments constitute a potential hazard to water quality and aquatic life as they may be released as a result of physico-chemical changes. These changes are most commonly stimulated by a change in the redox conditions and by microbial activity (5).

 

Smith and Huyck (1999)(6) described metal mobility under different environmental conditions. Although it is rather difficult to predict trace element mobility in soils and other terrestrial compartments, the authors referred to the capacity of an element to move with fluids after dissolution in surficial environments.

 

The concentrations of some elements measured in the solution obtained by various techniques from uncontaminated sediments (7), as follows (in μg g–1): Cd, 0.08–5; Fe, 0.08–29; Cu, 0.5–135; Mn, 25; and Zn, 0.1–750.

As instance, In several sediment or in some layers, oxides and hydroxides of Fe and Mn play very important roles in the distribution and behavior of trace elements, and may fix great amounts of some trace metals(8).Cationic species can be relatively easily sorbed onto clay minerals and onto oxy/hydroxides of Fe and Mn, as well as on organic compounds that can highly control its behavior in soils (9).

 

 

Fig (1) Map of Euphrates river showing the position of stations

 

Table 1. Average of Concentration* of heavy metals in studied stations

Cd

Fe

Mn

Zn

Cu

Stations

22

420

327

84

317

1

28

884

330

96

386

2

38

680

370

89

416

3

15

634

365

94

390

4

25.75

570.5

348

90.75

377.25

Average

0.6-10

200-400

460-1100

120-820

16-110

EPA10 Standard

*Units by ug \ g

The present study included determination of five heavy metals cadmium, Iron, copper, zinc and manganese in sediment of the Euphrates River which is the most important river and sources of water in the area surrounding of Nasiriya City.

 

Four sampling sites were selected to represent different region of Euphrates River. A stations was chosen along the Euphrates River in center at Nasiriya city included in the present survey and their stations are show (Figure 1) .The sampling program carried out through a period September 2011.

 

2. MATERIALS AND METHODS:

Subsurface (0-20cm) water samples have been collected from four stations utilizing the sampling devise Recommended by EPA 2004 (10) .The samples analysis by using Atomic Absorption methods. Texture of sediment was determinate according to Czaban (2005)(11).Statistical

analysis was conducted by SPSS program version 11.

 

3. RESULTES AND DISCUSSION:

Heavy metals released into the Euphrates River by both natural processes and human activities, can be distributed among several different stations within the water environment and the level of metals in Euphrates River is listed in table 1.

 

Our data indicate that the level of Zn observed in Euphrates River water lie at the range of values reported by EPA standard. The highest conc. of  Zn were recorded sta.2(96 µg/g) and lowest was (84 µg/g)at sta. 1.This indicate that Euphrates River pollution has possibly discharge and Urban runoff and electricity generation station may be consider as the most significant sources of metals entering Euphrates River . 

 

Zinc is easily accumulated in bottom sediments. Its background contents in sediments of rivers are estimated at 110 and 115 mg kg–1 for Vistula and Rhein River, respectively. However, in polluted rivers its contents may reach up to 2000 and 14000 mg kg–1, as reported for these two rivers (12);(13).

 

This metal has quite a low abundance in the Earth’s crust and consider form compounds in which their oxidation states are usually not higher than +2.Main Zn sources are related to non ferric metal industry and to agricultural practices. Some fertilizers and in particular super phosphate can significantly contribute to Zn levels in water. Zinc may enter into waters from numerous sources including mine industrial and municipal wastes, urban runoff, but the largest input occurs from the erosion of soil particles containing Zn (14).

 

The elements of Group 7 only Mn is essential to living organisms Manganese is one of the most abundant trace elements in the lithosphere. Its common occurrence in rocks ranges from 350 to 2000 mg kg–1 and higher concentrations are associated with mafic rocks In some soils, redox potentials have a crucial impact on the behavior of some metals, in particular of Fe and Mn. The reduction of Mn3+ to Mn2+ by: Fe2+, Cr3+, Co2+, reduced S, phosphate ligands (e.g.,P2O74–),phenols, and other easily oxidizing organic compounds(15).

 

Table 2. Average of Soil isolated in studied stations

St.4

St.3

St.2

St.1

Soil isolated

27

28

32

14.5

clay %

35.2

24.8

24.8

42.2

%Silt

37.8

47.2

43.2

43.2

Sand %

 

Mn showed increments in sta.3 (370 µg/g). and the lowest values were recorded in stas.1 was (327µg/g). Low level of comparative with other metals due to a few loads transported by suspended sediment than the dissolved loads because Mn is a strongly "hydrophobic" element-that is, it adsorbs on to sediment particles more readily than remaining in solution by a factor of thousands to one.

 

Salomons and Fِrstner(16)(1984) reported the content of Mn in sediments of Rhine River at the value of 960 mg kg–1, whereas the highest Mn concentration in sediments of Odra River was 770 mg kg–1(17). The distribution of Mn in the surface sediments of the Baltic Sea varies from 120 to 2290 mg kg–1, and the highest concentrations, up to 7 260 mg kg–1, are in sediments of gulfs and lagoons (18). As well as Zn, Mn complex compounds of a relatively high stability constant occurring in soils solution are:, MnSO4, Zn(OH)2.

 

The largest proportion of Fe being inorganic. Cadmium and copper, on the other hand, have much greater levels than Zn, Mn inorganic metals.

 

Cu revealed the highest conc. 416 µg/g at sta.3. The lowest (317µg/g) was recorded in sta.1. Copper dissolved in the Euphrates River comes mostly from industrial and municipal wastewaters. Concentrations of dissolved copper generally increase in the downriver direction, especially near urban centers.  In many areas, sediments of rivers may be sinks for Cu, with little release to the water body.

 

Table 3: Statically Analysis of Elements at confidence limit 95%

Station4

Station3

Station2

Station1

Elements

BC 7.61 ±  30.65

C 8.3 ± 29.6

AB 7.22 ± 31.03

A 5.77 ± 32.2

Cadmium (Cd)

B 5.89 ± 21.7

AB 5.82 ± 2201

B 5.31 ± 21.3

A 5.84 ± 22.95

Copper (Cu)

C 3.30 ± 14.48

A 4.73 ± 17.38

B 2.85 ± 15.64

A 2.43±  17.68

Manganese(Mn)

A 0.89 ± 8.07

A 0.87  ± 8.06

A 0.78 ± 8.15

A 0.87 ± 8.20

Iron (Fe)

A 150.23 ± 676.0

A 135.55± 662.5

A 159.61 ± 663

A 140.10 ± 662.5

Zinc (Zn)

 

 

Usually increased concentrations of Cu are observed near sewage outlets that that’s compatible with value of Cu in sta. 3 where lie under effect of sewage of city center. Increased Cu contents in surface layers of bottom sediments are reported as follows (in mg kg–1): India, rivers near the megacity Chennai (19): 760 –939 Poland, highly industrialized region(20): 17 –278 Russia, lake(21): 905 Sweden, lake(22), up to 2 000 UK, southwest industrialized region(23).

 

Copper contents in sediments of lakes and rivers of uncontaminated regions are reported to range (in mg kg–1) between: 36 and 74 in Lake Asososca, Nicaragua(24)18 and 39 in Lake Ro, Poland(25) 57 during wet and, karstic river Nahr Ibrahim, Lebanon (26).

 

The highest concentration of Cd was (38µg/g) and the lowest (15µg/g) were recorded in sta.3,4 respectively. During weathering processes, Cd forms simple compounds, such as CdO, Cd(OH)2, CdCl2 and CdF2 that are easily mobile and follow Zn, especially in sedimentation processes. Marine biota bioaccumulates Cd from sediment and they may act in the biomonitoring of aquatic pollutants(27).

 

The highest conc. of Fe was encountered in sta.2 (384µg/g), while lowest values were recorded from sta.1 was (840 µg/g). The relationship between Fe contents and some trace metals indicates an impact of soil Fe on the distribution of some trace metals. However, this relationship is significantly high only for Cu, Cd (28).

 

Statistical analysis of dissolved heavy-metal concentrations measured at locations of the Euphrates River during September 2011. Location variations were detected in these metals. We can say the location variations in heavy metals due to these metals are released to the Euphrates River from numerous sources. Typical sources are municipal wastewater-treatment plants, manufacturing industries, and rural agricultural cultivation and fertilization.

 

4. REFERENCES:

1.     Clark,R,B (1992).Marine pollution .3rd ed .Grate Britain .Oxford University press.

2.     Kennish MJ (1998) Trace metal-sediment dynamics in estuaries: Pollution assessment. Res Environ Contam Toxicol 155:69–110.

3.     Friberg, L., Nordberg, G.F., and Vouk, V.B., eds., 1979, Handbook on the toxicology of metals: Amsterdam, Elsevier/North-Holland  Biomedical Press, 709 p.

4.     Szefer P (1998) Distribution and behavior of selected heavy metals and other elements in various components of the southern Baltic ecosystem. Appl Geochem 13:287–292.

5.     Plewta (2010) Mine waters of the Upper Silesian Coal Basin-origin, pollutants and purification. Prace Nauk G,wnego Instytutu Gَrnictwa, 654 (in Polish).

6.     Smith KS, Huyck HLO (1999) An overview of the abundance, relative mobility, bioavailability, and human toxicity of metals. In: Plumlee GS, Logsdon JJ (eds) The environmental geochemistry of mineral deposits. Part A. Processes, techniques, and health issues. Review Econ Geol 6A:29–70.

7.     Kabata-Pendias A, Krakowiak A (1995) Soil parameters as a base for the calculation of background heavy metal status. In: Wilkens R-D, Fِrstner U, Knِchel A (eds) Heavy metal in the environment.CEP, Edinburgh, 1, pp 398–401.

8.     Wolt JD (1994) Soil solution chemistry. Applications to environmental science and agriculture. Wiley, New York.

9.     Zevenhoven R, Mukherjee AB, Bhattacharya P (2006) Arsenic flows in the environment of the European Union: A synoptic review In: Bhattacharya P, Mukherjee AB., Zevenhoven R, Loepper RH (eds) Arsenic in soil and groundwater: biogeochemical interactions. Elsevier Book Series.

10.   U.S. EPA (2003) Ambient water quality criteria. EPA-440/5-80-071. Office of water regulations and standards. Criteria and Standard Division. Washington, DC.

11.   Czaban J, Wrَblewska B (2005) Microbial transformation of cadmium in two soils differing in organic matter content and texture. Polish J Environ Studies 14:727–737.

12.   Helios-Rybicka E (1993) Phase-specific bonding of heavy metals in sediments of the Vistula River. Appl Geochem, Suppl Issue 2:45–48.

13.   Kabata-Pendias A, Pendias H (2001) Trace elements in soils and plants, 3rd ed., CRC Press, Boca Raton, FL.

14.   U.S. EPA (1980) Exposure and risk assessment for zinc. Office of Water Regulations and Standards (WH-553) EPA 440/4-81-016. PB85-212009.

15.   Bartlett RJ (1999) Characterizing soil redox behavior. In: Sparks DL (ed) Soil physical chemistry, 2nd ed., CRC Press, Boca Raton, FL, pp 371–397.

16.   Salomons W, Fِrstner U (1984) Metals in the hydrocycle. Springer-Verlag, Berlin Heidelberg.

17.   Kucharzewska K, Borkowski J, Kucharzewski A (1991) Contents of heavy metals in sediments and alluvial soils of river Odra. Conf Geological Aspects of Environ Protect, AGH, Krakَw, pp 172–176.

18.   Szefer P (2002) Metals, metalloids and radionuclides in the Baltic Sea Ecosystem. Elsevier, Amsterdam.

19.   Govindarajan S, Rao VNR (1992) Accumulation of trace metals in the marine biota and their biological transport. Acta Botanica Indica 20:1–5.

20.   Aleksander-Kwaterczak U, Helios-Rybicka E (2004) Heavy metals distribution in the river sediment depth profiles of the Ma Panew River (southern Poland). Geologia 30:153–164

21.   Lukin A, Dauvalter V, Kashulin N, Yakovlev, V, Sharov A, Vandysh (2003) Assessment of copper-industry impact on a subarctic ecosystem. Sci Total Environ 306:73–83.

22.   Bradley RW, Morris JR (1986) Heavy metals in fish from a series of metal contaminated lakes near Sudbury, Ontario. Water Air Soil Polut 27:341–254

23.   Bryan GW, Langston WJ (1992) Bioavailability, accumulation and effects of heavy metals in sediments with special reference to United Kingdom estuaries: a review. Environ Polut 76:89–131

24.   Cruz AC, Fomsgaard IS, Lacayo J (1994) Lead, arsenic, cadmium and copper in Lake Asosca, Nicaragua. Sci Total Environ 155:229–236.

25.   Skwarzec B (2006) Studies on contamination of lake Ro«nowskie with trace metals and numerological modeling of contaminant transport using surface-water model system. Ph. D. Thesis, Univ of Mining & Metallurgy, Krakَw.

26.   Brigden K, Stringer R, Santillo D (2002) Heavy metal and radionuclide contamination of fertilizer products and phosphogypsum waste produced by the Lebanese Chemical Co, Lebanon. Greenpeace Research Laboratories, Tech Note 13/2002, University of Exeter: (www.greenpeace.to/ publications.pdf/ LCC_2002.pdf).

27.   Christensen TH, Haung PM (1999) Solid phase cadmium and the reaction of aqueous cadmium with soil surfaces. In: McLaughlin MJ, Singh BR (eds) Cadmium in soils and plants. Kluwer Acad Publ, London, pp 65–96.

28.   Sparks DL (1995) Environmental soil chemistry. Acad Press, San Dieg.

 

 

Received on 19.04.2013                Accepted on 20.07.2013        

Modified on 18.08.2013                         ©A&V Publications all right reserved

Research J. Science and Tech 5(4): Oct.- Dec.., 2013 page 445-448