... (1984). Organic Complexation of heavy metals in estuarine and surface water samples. In: C. J. Cramer and J. C. Duinker, (Ed.). Complexation of trace metals in natural waters. Martinus Nijhoff, ... PURIFICATION CAPACITY OF WETLANDS Observations show that both natural and artificial wetlands have a capacity to purify wastewater containing heavy metals (Matagi, 1993; Tam and Wong, 1994; ... are mainly multidentate organic molecules. These are natural organic matter, including humic, tannic and fulvic acids (HA, TA, & FA). An understanding of heavy metal organic interactions...