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A h igh concentration of arsenic compounds w as observed in tube well water of Bangladesh. T wo species of arsenic compounds were arsenite a nd arsenate. The average ratio of arsenite to t otal arsenic was approximately 25%. R ejection characteristics of arsenic comp ounds as different species of arsenite and [1] P. Bhattacharya, Water Resources Development, 13(1) (1997) 79. [2] A. Chatterjee,Analyst, 120 (1995) 643. [3] J .M.Desesso, Repro. Toxicol., 12(4) (1998) 385. [4] K.A.Gmeme,J. EmergencyMed., 16(1)(1998) 45. [5] B.K. Mandal, Science Total Environ., 218 (1998) 185. [6] M.D.Masud Karim, War. Res., 34(1) (2000) 304. [7] T. Urase, Desalination, 117 (1998) 11.