Development of Lead Preconcentration on Ion Exchanger Resin With Tannin Extraction From Acacia Mangium Extract (Acacia mangium Willd)

The heavy metal ion contained in water tend to be so low that the analysis process requires pre-concentration techniques using ion exchange resins. The use of ion exchange resins in pre-concentration techniques had advantages such as minimizing loss of analyte, using small amount of resins and environmentally friendly. In this study, extracted tannin from Acacia Mangium leaves was used as the raw material for ion-exchange resin production. The polymerization reaction of extracted tannin with the addition of concentrated H2SO4 is done so that the resin is not easily soluble in water. The result of polymerization of extracted tannin (PTE) was characterized qualitatively using Fourier Transform Infra-Red (FTIR). To know its ability as ion exchange resin, PTE was examined with retention parameters and analytical validation. The optimum retention parameter was obtained at eluent concentration of HNO3 2 M in 5 mL. Based on the validation test of the analysis method, the value of repeatability with % RSD is 0.97%, the linearity of R 2 0.9986 in the range of 0.25-100 ppm, the sensitivity of 0.067 ppm, the limit of detection (Limit of Detection/LOD) of 0.019 ppm and the recovery of 102.3% - 110.91%. The result of the sample test shows that the Lead level in Ciliwung River is 105-267 ppb.