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5- Arsenic in Drinking WHO., (2011), "Guideline for drinking water quality", fourth ed. World Health Organization, Singapore (Geneva), pp 315-318. 6- Berg, M., Trang, P. T. K., Stengel, C., Buschmann, J., Viet, P. H., Dan, N. V., Giger, W. & Stuben, D., (2009), "Hydrological and sedimentary controls leading to arseniccontamination of groundwater in the Hanoi area", Vietnam: The impact of iron-arsenic ratios, peat, river bank deposits, and excessive groundwater abstraction. Chemical Geology, 249, pp 91-112. 7- Bhumbla, D. K. & Keefler, R. F., (1994), "Arsenic mobilization and bioavailability in soils, Niragu JO Arsenic in the Environment", Part I, Cycling and Characterization, John Wiley & Sons, New York Ed. Book, pp 51 82. 8- Bodek, I., Lyman, W. J., Reehl, W. F. & Rosenblatt, D. H., (1988), "Environmental Inorganic Geochemistry", NY: Pergaman, pp 43-47. 9- Cai, X., Yu,y., Huang, Y., Zhang, L., Jia, P.M., Zhao, Q., Chen, Z., Tong, J.H., Dai, W., & Chen, G.Q., (2003), "Arsenic trioxide-induced mitotic arrest and apoptosis in acute promyelocytic leukemia cells", pp 1333-1337.

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using multivariate and spatial analyses in the Keta basin, Ghana." Journal of African Earth Sciences 58(2): 220-234 31- Nickson, R.T., Mcarthur, J.M., Ravenscroft, P., Burgess, W.G., Ahmed, K.M (2000), "Mechanism of arsenic release to groundwater, Bangladesh and West Bengal", Applied Geochemistry 15, pp 403-413.

14- Gibbs, R., Sarkar, S. K., & Saha, M., (1970), " Mechanisms controlling world water chemistry. Science", 170, pp 1088-1090. 15- Halim, M. A., Majumder, R. K., Nessa, S. A., Hiroshiro, Y., Uddin, M. J., Shimada, J. & Jinno, k., (2009), "Hydrogeochemistry and arsenic contamination of groundwater in the Ganges Delta Plain, Bangladesh", Journal of Hazardous Materials, 164, pp 1335 1345. 16- Harvey, C. F., Swartz, C. H., Badruzzaman, A. B. M., Keon-Blute, N., Niedan, V., Brabander, D., Oates, P. M., Ashfaque, K. N., Islam, S., Hemond, H. F. & Ahmed, M. F., (2002), "Arsenic mobility and groundwater extraction in Bangladesh", Science, 298, pp 1602 1606. 17- Henke, K.R., (2009), "Arsenic: Environmental Chemistry", Health Threats and Waste Treatment. United Kingdom: John Wiley & Sons, pp 72- 160. 19- Hounslow, A., (1995), "Water quality data. Analysis and interpretation", CRC, pp 34-36. 20- Kevin, H., (2009), "Arsenic: Environmental Chemistry, Health Threats and Waste Treatment", United Kingdom: John Wiley & Sons, pp 81-88. 20- Li, S. & Zhang, Q., (2008), "Geochemistry of the Han river basin China", 1. Spatial distribution of the major ion compositions and their controlling factors, Applied geochemistry, 23, pp 3535-3544. 21- Liu, C. W., Lu, K. L., Kao, Y. H., Wang, C. J., Maji, S. K. & Lee, J. F., (2014), "Identifying sources and controlling factors of arsenic release in saline groundwater aquifers", Hydrology and Earth System Scinece, 18, pp 1089-1103. 22- Macur, R. E., Jackson, C. R., Botero, L. M., McDermott, T. R. & Inskeep, W. P., (2004)," Bacterial populations associated with the oxidation and reduction of arsenic in an unsaturated soil", Environ. Sci. Technol., 38, pp 104 11. 23- Macur, R. E., Wheeler, J. T., McDermott, T. R. & Inskeep, W. P., (2001), "Microbial populations associated with the reduction and enhanced mobilization of arsenic in mine tailings", Environ Sci Technol., 35, pp 3676 82. 24- Rahman, M., Naidu, R, and Bhattacharya, P., (2009), "Arsenic contaminationin groundwater in the Southeast Asia region. Environ", Geochem. Health, 31, pp 9 21. 25- Smedley, P. L. & Kinniburgh, D. G., (2002), "A review of the source, behaviour and distributionof arsenic in natural waters", Applied Geochemistry, 17, pp 517 568.

26- Todd, D. K., and Mays, L. W.,(2005), "Groundwater Hydrology", John Wiley & Sons, Inc., pp 636. 27- Wang, S. & Mulligan, C. N., (2006), "Effect of natural organic matter on arsenic release from soils and sediments in to groundwater", Environ, Geochem. Health, 28, pp 197 214. 28- Wang, S. W., Liu, C. W. & Jang, C. S., (2007), " Factors responsible for high arsenic concentrations 29- Welch, A.H., Lico, M.S. Hughes, J.L., (1988), "Arsenic in ground water of the western United States" GroundWater, 26, pp 333 347. 30-Yidana, S. M., B. Banoeng-Yakubo and T. M. Akabzaa (2010), "Analysis of groundwater quality