عنوان مقاله [English]
Maharloo Lake is one of the most important water ecosystems in Iran, which is nowadays exposed to multiple risks and threats due to poor water management, salt extraction, and heavy metal pollution. In this study, the concentrations of such heavy metals as chromium, copper, zinc, arsenic, cadmium, and lead in both water and salt samples collected from areas in the north and south of the lake were determined by atomic absorption (AA-670G) after the samples had been digested. Results showed that metal concentrations in the salt samples taken from both the northern and southern areas had identical mean values in the order of Cr> Cu> As> Cd> Pb. An almost similar pattern was detected in metal concentrations in water samples taken from the same areas but with a slight difference in the way they were ordered (Cr> Cu> As> Pb> Cd). It was found that both water and salt samples collected from the northern areas had higher metal concentrations, except for that of Pb which was slightly lower. Comparison of the mean values of metal concentrations in the Salt Lake and those of Sirjan, Lar, and Firoozabad salt mines revealed that copper, cadmium, and lead had their highest concentrations in the Salt Lake while arsenic and chromium recorded their highest values in samples taken from Lar and Firoozabad salt mines, respectively. Based on these findings, it may be concluded that the increased metal concentrations observed in samples from both northern and southern areas of the lake are due to the sewage and effluents from urban, industrial, and hospital sources in Shiraz disposed into the lake as well as such other human activities as farming in the areas around the lake, especially in the northern stretches. These observations call for preventive measures to avoid further water quality degradation in the area.
10. Leendertse, P.C., Scholten, M.C., and VanderWal, J.T. (1996). “Fate and effects of nutrients and heavy metals in experimental salt marsh ecosystems.” J. of Environmental Pollution, 94(6), 19-29.
11. Eksperiandova, L., Makarovska, Y., and Blank, A. (1998). “Determination of small quantities of heavy metals in water-soluble salts and natural water by X-ray fluorescence.” J. of Analytica Chimica Acta,
12. Yap, C., Ismail, A., Tan, S., and Omar, H. (2002). “Correlations between speciation of Cd, Cu, Pb and Zn in sediment and their concentrations in total soft tissue of green-lipped mussel Perna viridis from the west coast of Peninsular Malaysia.” J. of Environment International, 28(5), 117-126.
13. Salati, S., and Moore, F. (2010). “Assessment of heavy metal concentration in the Khoshk River water and sediment, Shiraz, Southwest Iran.” J. of Environmental Monitoring and Assessment, 164(8), 677-689.
14. Molayusefi, M.M., and Hayati, B. (2010). “Estimate the recreational value of the lake Shiraz Maharlu using contingent valuation.” J. ofIran's Natural Resources, 63(3), 291-301. (In Persian)
15. Mohamadi, H., Kafilzade, F., and Kadivar, E. (2007). “Isolation of bacteria degrading polycyclic aromatic hydrocarbons (PAHs) from the Maharloo Lake and the effect of salt concentration on PAH degradation.”
J. of School of Public Health and Institute of Public Health Research, 5(1), 67-77. (In Persian)
16. Banayi, K. (1996). “Contamination of soil and water in the lake catchment area Maharlu.” Province Department of Environmental Protection, Tehran. (In Persian)
17. Haritonidis, S., and Malea, P. (1999). “Bioaccumulation of metals by the green alga Ulva rigida from Thermaikos Gulf, Greece.” J. of Environmental Pollution, 104(5), 365-372.
18. Kafilzadeh, F., Kargar, M., and Kadivar, E. (2006). “Concentrations of Cd, Zn, Cu, Fe and Ni in the dry river near Shiraz and some crops.” J. of Environmental Science and Technology, 67(3), 67-75. (In Persian)
19. Alsagh, A. (2012). “Determination of heavy metals Ni, Cr, Mn and Co in Salt obtained by water treatment and uts comparison with rock salt.” J. of Iranian Food Science and Technology Research, 7(4), 340-336.
20. Forghani, G., Moore, F., Lee, S., and Qishlaqi, A. (2009). “Geochemistry and speciation of metals in sediments of the Maharlu Saline Lake, Shiraz, SW Iran.” J. of Environmental Earth Sciences, 59(1),173-184.
21. Salati, S., and Moore, F. (2010). “Assessment of heavy metal concentration in the Khoshk River water and sediment, Shiraz, Southwest Iran.” J. of Environmental Monitoring and Assessment, 164(1/4), 677-689.
23. Institute of Standards and Industrial Research. (2009). Food and feed-maximum limit of heavy metals,
1st Ed., Islamic Republic of Iran, Tehran. (In Persian)