[1] Q. Cai, M. L. Long, M. Zhu, M. Zhu, Q. Z. Zhou, L. Zhang, and J. Liu, Environ. Pollut. 157, 3078 (2009).
[2] J. Liu, R. Goyer, and M. P. Waalkes. Toxic ef fects of metals, in: Casarett and Doull’s Toxicology (The Basic Science of Poisons, New York, 2007).
[3] M. Z. Tan, F. M. Xu, J. Chen, X. L. Zhang, and J. Z. Chen, Pedosphere 16, 545 (2006).
[4] N. P. A. Saby, J. Thioulouse, and C. C. Joliver, Sci. Total Environ. 407, 5644 (2009).
[5] T. Radu and D. Diamond, J. Hazard. Mater. 171, 1168 (2009).
[6] J. Chou, G. Clement, and B. Buursavich, Environ. Pollut. 158, 2230 (2010).
[7] C. N. Block, T. Shibata, and H. M. Solo-Gabriele, Environ Pollut. 148, 627 (2007).
[8] R. Carr, C. S. Zhang, N. Moles, and M. Harder, Environ. Geochem. Health. 30, 45 (2008).
[9] D. F. Zhang, Matlab Wavelet Analysis and Project Application (National Defence Industry Press, Beijing, 2008).
[10] Y. Liang, Spectral analysis foundation of XRF (Science Press, Beijing, 2007).