Youn Sung Kim
Samsung SDI, Republic of Korea
Title: Reviews of organic-assisted dissolution method to enhance the quantitative Analysis for the determination of hexavalent chromium (Cr(VI)) in polymer
Biography
Biography: Youn Sung Kim
Abstract
An organic-assisted alkaline extraction method was developed for the determination of hexavalent chromium (Cr(VI)) in polymers. The stabilization of polymer as a pre-step of the alkaline extraction provided good extraction efficiency of Cr(VI)) from the sample. The optimization of the experimental conditions affecting the extraction and UV-Vis spectrophotometric analysis was accomplished by the evaluation the recovery rate of Cr(VI) through the analysis of Cr(VI) in in-house polymer reference materials. Also, we developed THF (Tetrahydrofuran)-assisted alkaline extraction method to determine Cr(VI) in the presence of Sb(III). The developed method suppressed the reduction by the formation of Sb(III)-THF adduct which was indentified by XRD, NMR and MALDI-TOF-MS. When applied to the in-house prepared reference polymers containing Sb(III), the method significantly enhanced the recovery to nearly 95 % from <3 % of the conventional extraction method. Low recovery of Cr(VI) due to the reduction to Cr(III) by Sb(III) has been an issue in the implementation of Regulation of Hazardous Substances (RoHS) directive.