SURVEY ON VARIATION OF METAL CONCENTRAIONS AND SPECIATION IN RAINY RIVER AND APPLICATION OF DGT-PASSIVE-SAMPLING FOR ESTIMATING THE OCCURRENCE OF THE LABILE FRACTION IN RAINY RIVER

Abstract

 This study surveyed on the concentration variation of total and labile fraction of metals in a river during rain events. Moreover, we examined the applicability of DGT-Passive-Sampling for understanding the occurrences of the labile fraction in rainy river without grab sampling. As a result, total metal concentrations of Al, Fe, Mn, Cu, Li, Ti, and V tended to increase with the increase of SS concentration. On the other hand, there was no clear trend in the variation of the labile fraction concentration with the SS concentration. Furthermore, the estimated concentration of labile Mn and Cu acquired by DGT-Passive-Sampling were at the same order of magnitude with the results of grab sampling.