Spatial Variations of Trace Metals and Their Complexation Behavior with DOM in the Water of Dianchi Lake, China.

Generally, humic substances are the primary metal-binding ligands for trace metals, and most O-containing acid functional groups, such as carboxyls and phenols and relatively low abundance S- and N-containing functional groups, were proved to be metal-binding ligands, and a molecular structure proximal to metal-binding sites may be significant in metal coordination by DOM, creating stable complexes of varying complexing strengths [ 18 , 19 ].

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Ti, Fe and Sr together with Co and as had a consistent horizontal distribution of a decreasing trend in the direction of water flow, which varied according to ratios of Sr/Mg and Ca/Mg ( Figure 3 ), indicating that these metals were liberated from the related lattice of carbonates.

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