A chelation method was used to separate labile metal fractions in marine water. A chelating resin (Metalfix® Chelamine®) with immobilized tetraethylenepentamine was used to chelate the divalent metals of Cu, Pb, Zn, Cd, Co and Ni in the water samples. The extracted heavy metals were eluted with 2M HNO3, deionized water, 0.12M NH3·H2O and deionized water sequentially. The recovery rates of the method for the spiked bivalent metal ions were 96-103% for Zn, 85-91% for Pb, 79-91% for Cd and 93-102% for Ni respectively. The chelation method was used to study the labile heavy metal concentrations in the coastal water of Hong Kong. The metal concentrations in suspended solids, the total dissolved metal concentrations and the labile metal concentrations of the coastal water samples in 10 different locations were analyzed. The results show that labile metals constituted up to 20% of the total dissolved metals in the coastal water of Hong Kong. Among the 10 sampling sites investigated, the sites at Tsuen Wan, Kwun Tong, Tsim Bei Tsui and Luk Keng were more polluted than other sites with higher metal concentrations in suspended solids and dissolved forms. The results reflect the potential contamination sources in the vicinities of these sampling sites.
|Number of pages||16|
|Journal||ACS Symposium Series|
|Publication status||Published - 1 Dec 2002|
ASJC Scopus subject areas
- Chemical Engineering(all)