The proportion sum of EXC and CARB of Cd was 54.19%, which was
the largest among the twelve elements, and that of Mn was the second
largest. Those of other metals were all lower than 10% except Pb valued
10.78%. Therefore, Cd and Mn in sediments were of higher secondary release
potential. The transfer ability of metals in sediments could be valued
by transfer coefficient which is determined by the percentage of
EXC (Maiz et al. 2000; Pueyo et al. 2004). The heavy metal transfer coef-
ficient were Cd N Mn N Sb N Cu N Zn N Ni N As N Pb N Hg N Cr N Al N Fe.
Tucker 3 model calculated the percentages of variances that explained
by all modelings from [111] to [333] (Fig. 5a). The modeling
with complexity [122] was selected for detailed interpretation. It explained
81.93% of the total data variance.