[3] [3] Anayah F M, Almasri M N. Applied Geography, 2009, 29(4): 588.

[4] [4] Kara D, Fisher A, Hill S J. Journal of Hazardous Materials, 2009, 149(1): 166.

[5] [5] Pohl P. Trends in Analytical Chemistry, 2009, 33(7): 343.

[8] [8] De Oliveira S R, Raposo Jr J L, Gomes Neto J A. Spectrochimica Acta Part B: Atomic Spectroscopy, 2009, 64(6): 593.

[9] [9] Villanueva-Alonso J, Pe a-Vázquez E, Bermejo-Barrera P. Spectrochimica Acta Part B: Atomic Spectroscopy, 2009, 64(7): 659.

[10] [10] Donati G L, Kron B E, Jones B T. Spectrochimica Acta Part B: Atomic Spectroscopy, 2009, 64(6): 559.

[12] [12] Amorim F A C, Ferreira S L C. Talanta, 2005, 65(4): 960.

[13] [13] Projahn H, Steeg U, Sanders J, et al. Analytical and Bioanalytical Chemistry, 2004, 378(4): 1083.

[14] [14] Correia P R M, De Oliveira E, Oliveira P V. Talanta, 2002, 57(3): 527.