References
- Offner , H. G. and Witucki , E. F. 1968 . J. Am. Wat. Wks. Assoc. , 60 : 947
- Dinman , B. D. 1972 . Proc. Int. Symp. Environ. Health Aspects of lead 45 – 57 . Amsterdam
- Cheremisinoff , P. N. and Habib; , Y. H. 1972 . Wat. Sew. Wks , 119 : 73
- Waldbott; , G. L. 1973 . “ Health Effects of Environmental Pollutants ” . 131 161 Saint Louis : C. V. Mosby Co .
- World Health Organization . 1972 . Health Hazards of the Human Environment . W. H. O. , : 179
- Rojas , J. , Lopez Fernandez , J. M. and Valcarcel , M. 1982 . Microchem. J , 27 : 433
- Rojas , J. , Lopez Fernandez , J. M. and Valcarcel , M. 1982 . Microchem. J , 27 : 445