1. 1. B. L. Carson, H. V. Ellis, and J. L. McCann, “Toxicology and Biological Monitoring of Metals in Humans”, 1987, Lewis, Michigan.
2. 2. A. K. De, “Environmental Chemistry”, 3rd ed., 1996, New Age International (P) Limited, New Delhi, 263.
3. 3. R. A. Goyer, in “Casarett and Doull's Toxicology: The Basic Science of Poisons”, ed. C. D. Klaassen and M. O. Amdur, 3rd ed., 1986, J. Doull, MacMillan Publishing Company, New York, 598.
4. 4. M. E. Khalifa and H. M. A. El-Nader, Rev. Chim., 1996, 47, 360.
5. Spectrophotometric and AAS Determinations of Trace Zinc (II) in Natural Waters and Human Blood after Preconcentration with Phenanthraquinone Monophenylthiosemicarbazone.