1. R.D. Wilken, Fresenius J. Anal. Chem. 342 (1992) 795.
2. P.M. Padilha, L.A. de Melo Gomes, C.C.F. Padilha, J.C. Moreira, N.L. Dias Filho, Anal. Lett. 32 (1999) 1807.
3. T. Pochinok, T. Synkova, T. Shekhovtsova, Z. Temerdashev, J. Anal. Chem. 62 (2007) 184.
4. F. W. Oehme, Toxicity of Heavy Metals in the Environment, Marcel Dekker, New York, 1989.
5. S.Y. Quek, D. Wase, C.F. Forster, Water SA 24 (1998) 251.