1. American Public Health Association (1965) Standard Methods for the Examination of Water and Wastewater, 12th edn, New York, pp. 58–60.
2. Barnes, J.W. and Murray, C.W. (1930) Accuracy of the Gutzeit method for the determination of minute quantities of arsenic. Ind. Eng. Chem. Anal. Ed., 2(1), 29–30.
3. Brown, K.G. and Chen, C.J. (1994) Observed dose-response for internal cancers and arsenic in drinking water in the blackfoot disease endemic region of Taiwan, in Arsenic Exposure and Health (eds W.R. Chappell, C.O. Abernathy, and C.R. Cothern), Science and Technology Letters, Northwood, pp. 153–69.
4. Furman, N.H. (ed.) (1962) Standard Methods of Chemical Analysis, 6th edn, vol. I, Van Nostrand, Princeton, N.J., pp. 118–24.
5. Gmelin’s Handbook of Inorganic Chemistry, 1952. Arsenic 8th edn, Weinheim, Verlag Chemie, pp. 228–30.